CN110862167A

Movatterモバイル変換

Info

Publication number: CN110862167A
Application number: CN201910808630.4A
Authority: CN
Inventors: 张怀志; 刘建珂; 李辉
Original assignee: Shenzhen Zhongtuotianda Environmental Engineering Co Ltd
Current assignee: Shenzhen Zhongtuotianda Environmental Engineering Co Ltd
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-03-06

Abstract

The invention provides an electrode foil corrosion wastewater treatment system, which comprises: the pretreatment system is used for adjusting the pH value of the corrosion wastewater and decomposing pollutants in the corrosion wastewater to form a concentrated solution; the tubular microfiltration membrane system is used for receiving the concentrated solution conveyed from the front treatment system and filtering suspended particles in the concentrated solution; the two-stage reverse osmosis system is connected with the output end of the tubular microfiltration membrane system and is used for desalting the filtered filtrate; and the cleaning system is used for cleaning the tubular microfiltration membrane system and the two-stage reverse osmosis system at regular time. An electrode foil corrosion wastewater treatment process comprises the following steps: regulating the pH value of the corrosion wastewater and decomposing pollutants by a pretreatment system; s20: filtering suspended particles of the concentrated solution to form filtrate; s30: and desalting the filtrate. The electrode foil corrosion wastewater treatment system provided by the invention has the advantages of short reaction time, small occupied area and stable effluent quality.

Description

Electrode foil corrosion wastewater treatment system and treatment process thereof

Technical Field

The invention belongs to the technical field of electrode foil wastewater treatment, and particularly relates to an electrode foil corrosion wastewater treatment system and a treatment process thereof.

Background

The electrode foil generally undergoes an etching process and a chemical conversion process, wherein the etching process takes the electronic optical foil as a raw material, and holes are formed on the surface of the electronic optical foil by etching through an electrochemical method, so that the surface areas of the cathode and anode optical foils are increased, and the specific capacitance of the cathode and anode optical foils is improved to prepare the etched foil. In the corrosion process, corrosion wastewater is generated, and in the past, the treatment method of the electrode foil corrosion wastewater is directly abandoned, so that water resources are greatly wasted.

At present, some enterprises slowly start to recover and treat the electrode foil corrosion wastewater, but the pretreatment stage of the electrode foil corrosion wastewater generally comprises four stages of chemical coagulation, precipitation, medium filtration and ultrafiltration.

Disclosure of Invention

The invention aims to provide an electrode foil corrosion wastewater treatment system, which solves the technical problems of large occupied area, long hydraulic retention time, incapability of working under an alkaline condition, easiness in blockage, limited water outlet quality and the like caused by adopting four stages of chemical coagulation, precipitation, medium filtration and ultrafiltration as pretreatment of corrosion wastewater in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: provided is an electrode foil corrosion wastewater treatment system including:

the pretreatment system is used for adjusting the pH value of the corrosion wastewater and decomposing pollutants in the corrosion wastewater to form a concentrated solution;

the tubular microfiltration membrane system is used for receiving the concentrated solution conveyed from the pretreatment system and filtering suspended particles in the concentrated solution;

the two-stage reverse osmosis system is connected with the output end of the tubular microfiltration membrane system and is used for desalting the filtered filtrate;

and the cleaning system is used for cleaning the tubular microfiltration membrane system and the two-stage reverse osmosis system at regular time.

Further, the electrode foil corrosion wastewater treatment system also comprises a PLC control cabinet, wherein the PLC control cabinet is respectively electrically connected with the pretreatment system, the tubular microfiltration membrane system, the two-stage reverse osmosis system and the cleaning system, and the PLC control cabinet is used for controlling the working sequence of the pretreatment system, the tubular microfiltration membrane system, the two-stage reverse osmosis system and the cleaning system.

Further, the preprocessing system comprises:

the waste water equalizing tank is used for containing corrosive waste water;

the first reaction tank is used for adjusting the pH value of the corrosion wastewater conveyed by the wastewater equalizing tank;

and the second reaction tank is used for finely adjusting the pH value of the corrosion wastewater conveyed by the first reaction tank and adding a medicament to decompose pollutants in the corrosion wastewater to form a concentrated solution.

Furthermore, the electrode foil corrosion wastewater treatment system also comprises a concentration tank and a clear water collecting tank;

the concentration tank is used for receiving the concentrated solution conveyed from the pretreatment system, the concentrated solution input end of the tubular microfiltration membrane system is used for collecting the concentrated solution conveyed from the concentration tank, the clear water collection tank is used for collecting the filtrate output from the filtrate output end of the tubular microfiltration membrane system, and the tubular microfiltration membrane system is also provided with a backflow end used for returning the concentrated solution remained in the tubular microfiltration membrane system to the concentration tank.

Further, the bottom of the concentration tank is connected with a sludge collection tank which receives the concentrated solution when the concentration of the concentrated solution in the concentration tank is large, the sludge collection tank is connected with a filter press which is used for extruding sludge in the sludge collection tank into filter cakes, the water outlet end of the filter press is connected to the wastewater equalization tank, and the water outlet end in the sludge collection tank is also connected to the wastewater equalization tank.

Further, the cleaning system includes a first cleaning assembly;

the first cleaning assembly includes:

the input end of the cleaning pipeline is connected with the filtrate output end of the tubular microfiltration membrane system, and the output end of the cleaning pipeline is connected with the concentrated solution input end of the tubular microfiltration membrane;

the cleaning pump is arranged in the cleaning pipeline and is used for reversely conveying the filtrate output by the tubular microfiltration membrane system to the concentrated solution input end of the tubular microfiltration membrane system;

the cleaning valve is arranged in the cleaning pipeline and used for controlling the on-off of the cleaning pipeline;

and the chemical tank is arranged in the cleaning pipeline and is used for adding chemical reagents into the cleaning pipeline at regular time to enhance the cleaning effect.

Furthermore, the two-stage reverse osmosis system comprises a first-stage reverse osmosis component and a second-stage reverse osmosis component which are arranged in sequence;

the tubular microfiltration membrane system comprises a plurality of tubular microfiltration membranes which are connected in series; the tubular microfiltration membrane is made of SIC materials.

Furthermore, a security filter for removing fine particles with turbidity higher than 1 degree is connected between the primary reverse osmosis assembly and the clear water collecting tank, and a medicine adding structure for adding a scale inhibitor into the filtrate is arranged on a water inlet pipe of the primary reverse osmosis assembly;

a first high-pressure pump is arranged between the cartridge filter and the first-stage reverse osmosis component, and a second high-pressure pump is arranged between the first-stage water production tank and the second-stage reverse osmosis component.

Furthermore, the primary reverse osmosis component is also provided with a primary concentrated water end, and the primary concentrated water end is used for outputting concentrated water and can be connected with a concentrated water tank or returning the concentrated water to the clear water collecting tank;

the second-stage reverse osmosis component is also provided with a second-stage concentrated water end, and the second-stage concentrated water end is used for outputting concentrated water and can be connected with a concentrated water tank or reflows the concentrated water to the clear water collecting tank.

The electrode foil corrosion wastewater treatment system provided by the invention has the beneficial effects that: compared with the prior art, the electrode foil corrosion wastewater treatment system comprises a pretreatment system, a tubular microfiltration membrane system, a two-stage reverse osmosis system and a cleaning system, wherein concentrated solution is filtered by the tubular microfiltration membrane system, and the tubular microfiltration membrane system has strong adaptability to the water quality change of corrosion wastewater, short reaction time, stable effluent water quality and small occupied area. Meanwhile, the ultrafiltration system and the two-stage reverse osmosis system are cleaned at regular time by the cleaning system, so that the service lives of the ultrafiltration system and the two-stage reverse osmosis system are longer.

The invention also provides an electrode foil corrosion wastewater treatment process, which is used for treating the electrode foil corrosion wastewater by the electrode foil corrosion wastewater treatment system and comprises the following steps:

s10: adjusting the pH value of the corrosion wastewater through a pretreatment system and decomposing pollutants in the corrosion wastewater to form a concentrated solution;

s20: filtering the suspended particles of the concentrated solution in the step S10 through a tubular microfiltration membrane system to form filtrate;

s30: desalting the filtrate by a two-stage permeation system;

wherein, the working sequence of the steps S10, S20 and S30 is controlled by a PLC control cabinet, and the PLC control cabinet controls the cleaning system to clean the tubular microfiltration membrane system and the two-stage reverse osmosis system at specific time intervals.

Further, step S20 includes the steps of:

s21: conveying the concentrated solution to a concentration tank;

s22: conveying the concentrated solution in the concentration tank to a tubular microfiltration membrane system through a circulating pump so as to be filtered by the tubular microfiltration membrane system;

and at intervals, the PLC control cabinet controls the first cleaning component to clean the tubular microfiltration membrane system, and when the concentration of the concentrated solution in the concentration tank is too high, the PLC control cabinet controls the concentrated solution to be conveyed to a sludge collection tank and a filter press for collection treatment.

Further, the step S31 includes the following steps: part of the concentrated water output by the first-stage reverse osmosis module is conveyed back to the clear water collecting pool, and part of the concentrated water is discharged; the step S32 includes the following steps: and conveying the concentrated water output by the secondary reverse osmosis component back to the clear water collecting tank.

The electrode foil corrosion wastewater treatment process provided by the invention has the beneficial effects that: compared with the prior art, the electrode foil corrosion wastewater treatment process provided by the invention has the advantages that the electrode foil corrosion wastewater is treated, and the effects of high effluent quality, stable effluent quality and long operation period can be achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic flow diagram of an electrode foil corrosion wastewater treatment system according to an embodiment of the present invention;

FIG. 2 is a schematic flow diagram of the pretreatment system and the tubular microfiltration system of FIG. 1;

FIG. 3 is a schematic flow diagram of the primary reverse osmosis module of FIG. 1.

Wherein, in the figures, the respective reference numerals:

1-pretreatment system; 2-a tubular microfiltration membrane system; 3-a concentration tank; 4-clear water collecting tank; 5-a circulating pump; 6-a sludge collecting tank; 7-a filter press; 8-a first cleaning assembly; 9-a first-stage reverse osmosis component; 10-a secondary reverse osmosis module; 11-first-level water production tank; 12-a secondary water production tank; 13-a cartridge filter; 14-a dosing structure; 15-a first high pressure pump; 16-a second high pressure pump; 17-a PLC control cabinet; 18-a concentrate tank; 19-a concentrate valve; 21-concentrated liquid input end; 22-filtrate output; 23-a reflux end; 31-a first liquid level detection device; 41-second liquid level monitoring device; 42-a first PH detection device; 81-washing the pipeline; 82-cleaning the pump; 83-cleaning the valve; 84-a chemical pool; 91-first level water inlet end; 92-first order pure water end; 93-first concentrated water end; 110-a wastewater equalization tank; 120-a first reaction tank; 130-a second reaction tank; 210-cleaning the inlet; 202-cleaning the inlet valve; 203-water inlet pipe; 204-a purge outlet; 205-cleaning the outlet valve; 206-outlet conduit.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1, a system for treating electrode foil corrosion wastewater according to the present invention will now be described. The electrode foil corrosion wastewater treatment system is used for treating electrode foil corrosion wastewater so as to achieve the purpose of recycling.

The electrode foil corrosion wastewater treatment system comprises a pretreatment system 1, a tubular microfiltration membrane system 2, a two-stage reverse osmosis system and a cleaning system.

The pretreatment system 1 is used for adjusting the pH value of the corrosion wastewater and decomposing pollutants in the corrosion wastewater to form a concentrated solution. The tubular microfiltration membrane system 2 is used for receiving the concentrated solution conveyed from the pretreatment system 1 and filtering suspended particles in the concentrated solution. The two-stage reverse osmosis system is connected with the output end of the tubular microfiltration membrane system 2 and is used for desalting the filtered filtrate. The cleaning system is used for cleaning the tubular microfiltration membrane system 2 and the two-stage reverse osmosis system at regular time.

Here, it should be noted that the tubular microfiltration membrane system 2 utilizes the cross-flow filtration principle, can endure very high turbidity, has short hydraulic retention time, is also ultra-microfiltration, and has good effluent quality, so that the tubular microfiltration membrane system can replace four combined processes of chemical coagulation, precipitation, medium filtration and ultrafiltration.

So, after current processing system 1 inserts corrosion wastewater, at first, pretreatment system 1 will adjust corrosion wastewater's pH value to the pollutant that will corrode among the wastewater decomposes out and forms the concentrate, then tubular microfiltration membrane system 2 will filter the concentrate in order to obtain filtrating, and last two-stage reverse osmosis system will carry out desalination in proper order to the filtrating and handle in order to obtain the better play water of purity. Simultaneously, still can regularly wash tubular microfiltration membrane system 2 and two-stage reverse osmosis system through cleaning system to guarantee tubular microfiltration membrane system 2 and two-stage reverse osmosis system's life.

The electrode foil corrosion wastewater treatment system provided by the invention comprises a pretreatment system 1, a tubular microfiltration membrane system, a two-stage reverse osmosis system and a cleaning system, wherein a concentrated solution is filtered by the tubular microfiltration membrane system 2, and the tubular microfiltration membrane system 2 has strong adaptability to the water quality change of corrosion wastewater, short reaction time, stable effluent water quality and small occupied area. Meanwhile, the ultrafiltration system and the two-stage reverse osmosis system are cleaned at regular time by the cleaning system, so that the service lives of the ultrafiltration system and the two-stage reverse osmosis system are longer.

In the present embodiment, referring to fig. 2, the pretreatment system 1 includes awastewater equalizing tank 110, a first reaction tank 120, and asecond reaction tank 130. Thewastewater equalizing tank 110 is used for containing corrosive wastewater, the first reaction tank 120 is used for adjusting the pH value of the corrosive wastewater conveyed by thewastewater equalizing tank 110, thesecond reaction tank 130 is used for fine adjusting the pH value of the corrosive wastewater conveyed by the first reaction tank 120, and a medicament is added to decompose pollutants in the corrosive wastewater to form a concentrated solution. Because it is difficult to adjust the PH of the waste corrosion water to a desired value at a time through the first reaction tank 120, thesecond reaction tank 130 is required to assist in fine adjustment of the PH, and meanwhile, the adjusting agent is added to thesecond reaction tank 130, and the stirring enables the adjusting agent to chemically react with the pollutants in the waste corrosion water to form insoluble suspended particles, which is a chemical coagulation process.

Preferably, in this embodiment, a fine grid net (not shown) may be further disposed before thewastewater equalization tank 110, and the fine grid net intercepts the large-volume particulate matters and the strip-like matters before the corrosive wastewater enters thewastewater equalization tank 110, so that the damage of the particulate matters and the strip-like matters to the pumps in the pipelines can be reduced.

It should be noted here that in the whole electrode foil corrosion wastewater treatment system, corrosion wastewater, concentrated solution, pure water, etc. need to be transported by using various pipes and pumps, for example, the corrosion wastewater in thewastewater equalization tank 110 needs to be transported to the first reaction tank 120 by a pipe and a lift pump, and the corrosion wastewater in the first reaction tank 120 needs to be transported to thesecond reaction tank 130 by another pipe and a lift pump, and if particulate matter and strip-like matter are involved in the pumps along with the liquid when the pumps are operated, the pumps are damaged.

In the present embodiment, referring to fig. 1 and fig. 2, the electrode foil corrosion wastewater treatment system further includes aconcentration tank 3 and a cleanwater collecting tank 4. The tubular microfiltration membrane system 2 has aconcentrate input end 21, afiltrate output end 22 and areturn end 23, theconcentration tank 3 is used for collecting the concentrate conveyed from the pretreatment system 1 (i.e. the second reaction tank 130), the concentrate input end 21 of the tubular microfiltration membrane system 2 is used for accessing the concentrate conveyed from theconcentration tank 3, the clearwater collection tank 4 is used for collecting the filtrate output from thefiltrate output end 22 of the tubular microfiltration membrane system 2, and thereturn end 23 is used for returning the concentrate remaining in the tubular microfiltration membrane system 2 to theconcentration tank 3.

Specifically, the top ofconcentrated pond 3 is equipped with first liquidlevel detection device 31 that is used for monitoring water level in theconcentrated pond 3, be equipped with circulatingpump 5 betweenconcentrated pond 3 and the tubular microfiltration membrane system 2, through the liquid level in theconcentrated pond 3 of first liquidlevel detection device 31 monitoring, when the liquid level reaches a take the altitude, start circulatingpump 5 and carry the corruption waste water in theconcentrated pond 3 to tubular microfiltration membrane system 2 in order to filter, and like this, can prevent when theconcentrated pond 3 water-logging is very few, circulatingpump 5 just starts the water in theconcentrated pond 3 of extraction, the power of extravagant circulatingpump 5 on the one hand, on the other hand also prevents the harm ofconcentrated pond 3 and circulatingpump 5.

Equally, be equipped with the second liquidlevel monitoring devices 41 that are used for monitoring the liquid level above the clearwater collecting pit 4, and simultaneously, because two-stage reverse osmosis system requires than higher to quality of water, consequently, still be equipped with the firstPH detection device 42 that is used for monitoring the PH value above the clearwater collecting pit 4, be equipped with the booster pump between clearwater collecting pit 4 and the two-stage reverse osmosis system, liquid level and the PH value of filtrating all reach the standard in the clearwater collecting pit 4, just can start the booster pump in order to carry the water in the clearwater collecting pit 4 to two-stage reverse osmosis system, thereby can play the effect of protection to two-stage reverse osmosis system.

Preferably, in this embodiment, the tubular microfiltration membrane system 2 comprises a plurality of tubular microfiltration membranes connected in series, so that the tubular microfiltration membrane system 2 can adjust the water yield by increasing or decreasing the number of tubular microfiltration membranes connected in series according to the actual water yield, and is very simple and convenient to use.

Preferably, tubular microfiltration membrane adopts the SIC material to make, and the tubular microfiltration membrane of this application adopts firm tubular structure to form the membrane through the sintering method, therefore the condition of disconnected silk can not appear, simultaneously, because tubular microfiltration membrane's membrane aperture is very little (0.1 micron), can all hold back whole suspended particle and mud in the concentrate, its solid-liquid separation effect should be better than the sedimentation tank far away, tubular microfiltration membrane is to suspended particle's clearance more than 99%, even reaches 100%, the removal of turbidity can reach < 1NTU, the play water turbidity is similar with the running water. In addition, the tubular microfiltration membrane can work under alkaline conditions for a long time, and solid-liquid separation is realized to the greatest extent by utilizing the characteristic of low solubility of metal hydroxide in a high-alkali environment. Meanwhile, for the sludge bulking phenomenon in the traditional sedimentation process, the tubular microfiltration membrane system 2 can be easily solved because the sedimentation tank is not used for solid-liquid separation, thereby greatly reducing the complexity of management operation and enabling high-quality and stable water outlet.

In this embodiment, referring to fig. 2 again, the electrode foil corrosion wastewater treatment system further includes a sludge collection tank 6 and afilter press 7. The sludge collecting tank 6 is connected from the bottom of theconcentration tank 3, the sludge collecting tank 6 is used for receiving the concentrated solution when the concentration of the concentrated solution in theconcentration tank 3 is large, the concentrated solution is subjected to solid-liquid separation in the sludge collecting tank 6, and the water outlet end above the sludge collecting tank can be connected to thewastewater equalizing tank 110 so as to recover wastewater in the next round. Thefilter press 7 is connected to the sludge outlet end of the sludge collecting tank 6, and the sludge in the concentratingtank 3 can also be directly connected to thefilter press 7, thefilter press 7 is used for pressing the sludge into a filter cake for filter cake collection, and the water outlet end of thefilter press 7 can be directly connected to thewastewater equalizing tank 110 for wastewater recovery of the next round. In the embodiment, the water delivery end of the sludge collection tank 6 and the filtered water of thefilter press 7 can return to thewastewater equalization tank 110 for cyclic treatment, and the recovery rate is close to 100%. In addition, thorough solid-liquid separation can be realized by thefilter press 7, and solid particles (filter cakes) can be recycled, so that the recycling of solid wastes is realized.

In this example, the tubular microfiltration membrane retains suspended particles in the concentrate during operation and forms a compressible filter cake on the surface of the tubular microfiltration membrane. The filter cake can also be used as a filtering medium, so that the filtering performance of the tubular microfiltration membrane is enhanced. But the cake layer also needs to be controlled to ensure that the transmembrane pressure differential is maintained within a reasonable range during filtration. When the solid content in theconcentration tank 3 rises to a certain value, the concentrated water in theconcentration tank 3 is discharged to the sludge collection tank through the pump, and the tubular microfiltration membrane is cleaned through the cleaning system.

Specifically, referring to fig. 2, the cleaning system includes afirst cleaning assembly 8, and thefirst cleaning assembly 8 is specially used for cleaning the tubular microfiltration membrane. Thefirst cleaning assembly 8 includes acleaning line 81, acleaning pump 82, a cleaningvalve 83, and achemical tank 84. The input ofwashing pipeline 81 is connected with tubular microfiltration membrane system 2'sfiltrating output 22, the output ofwashing pipeline 81 is connected with tubular microfiltration membrane's concentrate input, the scavengingpump 82 is arranged inwashing pipeline 81, the scavengingpump 82 is arranged in reverse carrying theconcentrated solution input 21 of tubular microfiltration membrane system 2 with the filtrating of tubular microfiltration membrane system 2 output, thepurge valve 83 is arranged inwashing pipeline 81, thepurge valve 83 is used for controlling the break-make ofwashing pipeline 81,chemical pond 84 is arranged in regularly adding chemical reagent inwashing pipeline 81 in order to strengthen the cleaning performance.

In this embodiment, after the tubular microfiltration membrane system 2 is operated for a period of time, the tubular microfiltration membrane system 2 needs to be backwashed normally, that is, thecirculation pump 5 is turned off, the cleaningvalve 83 is turned on, the cleaningpump 82 is started, and the filtrate output from thefiltrate output 22 of the tubular microfiltration membrane system 2 is reversely conveyed to theconcentrate input 21 thereof for backwashing. And when the system has run for a long time, when ordinary backwash can not clean the tubular microfiltration membrane, chemical cleaning can be carried out twice every week, and chemical cleaning is to increase the chemical reagent adding process on the basis of ordinary backwash, namely to start thechemical tank 84, for example, to clean the tubular microfiltration membrane by using the filtered liquid of 150-200 ppm sodium hypochlorite.

Referring to fig. 1, in the present embodiment, the two-stage reverse osmosis system includes a first-stagereverse osmosis module 9 and a second-stagereverse osmosis module 10, which are sequentially disposed, and the first-stagereverse osmosis module 9 and the second-stagereverse osmosis module 10 are sequentially disposed at thefiltrate output end 22 of the tubular microfiltration membrane system 2, so that the produced water after being treated by the electrode foil corrosion wastewater treatment system has higher purity and higher recovery value.

The first-stagereverse osmosis module 9 has a first-stagewater inlet end 91, a first-stagepure water end 92 and a first-stageconcentrated water end 93, wherein the first-stagewater inlet end 91 is used for accessing filtrate, the first-stagepure water end 92 is used for outputting purified water after purification treatment, and the first-stageconcentrated water end 93 is used for outputting concentrated solution generated after purification.

In addition, in order to ensure that water in each stage can be retained and stored in the whole electrode foil corrosion wastewater treatment system, the electrode foil corrosion wastewater treatment system also comprises a primarywater production tank 11 and a secondary water production tank 12.

Thewater tank 11 is produced to the one-level and is connected between the one-levelpure water end 92 of one-levelreverse osmosis subassembly 9 and the second grade of second gradereverse osmosis subassembly 10 intake the end, the second grade is produced the water tank 12 and is connected in the second grade pure water end of second gradereverse osmosis subassembly 10, the effect that thewater tank 11 was produced to the one-level and second grade produced water tank 12 is similar with clearwater collecting pit 4, be equipped with the third water level detection device who is used for monitoring the water level and the second PH detection device who is used for detecting the PH value on thewater tank 11 is produced to the one-level, be equipped with the.

In the present embodiment, referring to fig. 1 and fig. 3, acartridge filter 13 for removing fine particles with turbidity higher than 1 degree is connected between the primaryreverse osmosis module 9 and the cleanwater collecting tank 4, and achemical adding structure 14 for adding a scale inhibitor into the filtrate is arranged on a water inlet pipe of the primaryreverse osmosis module 9. Thecartridge filter 13 in this embodiment is used to filter fine particles (e.g., crushed resin) to prevent the fine particles from entering the primaryreverse osmosis module 9 and the secondaryreverse osmosis module 10 and damaging the primaryreverse osmosis module 9 and the secondaryreverse osmosis module 10. Meanwhile, themedicine adding structure 14 is used for adding a scale inhibitor before the filtrate enters the first reverse osmosis component, dispersing the insoluble inorganic salt in the water through the scale inhibitor, and preventing or interfering the insoluble inorganic salt from precipitating and scaling on the surface of the first-stagereverse osmosis component 9 or the second-stagereverse osmosis component 10.

A first high-pressure pump 15 is arranged between thecartridge filter 13 and the first-stagereverse osmosis component 9, and a second high-pressure pump 16 is arranged between the first-stagewater production tank 11 and the second-stagereverse osmosis component 10. The firstreverse osmosis module 9 and the secondreverse osmosis module 10 both utilize pressure difference to realize desalination and purification, so the first high-pressure pump 15 is used for realizing the pressure difference between the first-stagewater inlet end 91 and the first-stagepure water end 92 of the firstreverse osmosis module 9, and the second high-pressure pump 16 is used for realizing the pressure difference between the second-stage water inlet end and the second-stage pure water end of the secondreverse osmosis module 10.

In this embodiment, referring to fig. 3, the first-stagereverse osmosis module 9 further has a first-stage concentrate end 93, and the first-stage concentrate end 93 is used for outputting concentrate and can be connected to a concentrate tank or returning the concentrate to the clearwater collecting tank 4. Specifically, be equipped withdense water valve 19 between one-leveldense water end 93 and thedense water tank 18, when the dense water concentration of one-leveldense water end 93 output was not high, can break off the dense water valve, during dense water got into clearwater collecting pit 4, formed hydrologic cycle to there is water to flow all the time in guaranteeing one-levelreverse osmosis subassembly 9, and then reach the purpose that certain one-levelreverse osmosis subassembly 9 of preventing blockked up. When the concentration of the concentrated water output from the first-stageconcentrated water end 93 is high, theconcentrated water valve 19 is connected, and the concentrated water is introduced into theconcentrated water tank 18 for subsequent treatment, so that the concentrated water with high concentration is prevented from entering the clearwater collecting tank 4.

The secondaryreverse osmosis module 10 also has a secondary concentrate end for outputting concentrate and which may be connected to aconcentrate tank 18 or return the concentrate to the clearwater collection tank 4. The connection of the secondaryreverse osmosis module 10 to theconcentrate tank 18 and the cleanwater collection tank 4 is the same as that of the primaryreverse osmosis module 9, and a description thereof is not repeated.

In this embodiment, the cleaning system further includes a second cleaning assembly 20 and a third cleaning assembly (not shown), wherein the second cleaning assembly 20 is used for cleaning the primaryreverse osmosis assembly 9, and the third cleaning assembly is used for cleaning the secondaryreverse osmosis assembly 10.

Taking the second cleaning assembly 20 as an example, the second cleaning assembly 20 includes acleaning inlet 201, acleaning inlet valve 202, awater inlet pipe 203, two cleaningoutlets 204, two cleaningoutlet valves 205 and twowater outlet pipes 206, thewater inlet pipe 205 is connected to the first-stage water inlet 91 of the first-stagereverse osmosis assembly 9, thecleaning inlet 201 and thecleaning inlet valve 202 are both disposed on thewater inlet pipe 205, the twowater outlet pipes 206 are respectively connected to the first-stagepure water end 92 and the first-stageconcentrated water end 93, and the two cleaningoutlets 204 and two cleaningoutlet valves 205 are respectively disposed on the twowater outlet pipes 206. In this embodiment, since the operation principle of the primaryreverse osmosis module 9 is opposite to that of the tubular micro-filtration membrane, the cleaning of the primaryreverse osmosis module 9 should be performed by entering from theprimary water inlet 91, and when thecleaning inlet 201 is connected to external clean water and thecleaning inlet valve 202 is connected, the clean water enters from theprimary water inlet 91 and cleans solid particles on the membrane pores of the primaryreverse osmosis module 9 and exits from the primarypure water end 92 or the primaryconcentrated water end 93, thereby completing the cleaning.

Preferably, in the present embodiment, the primaryreverse osmosis module 9 and the secondaryreverse osmosis module 10 have the same structure, the primaryreverse osmosis module 9 includes a plurality of primary reverse osmosis membrane elements arranged in parallel, and the secondaryreverse osmosis module 10 includes a plurality of secondary reverse osmosis membrane elements arranged in parallel.

Taking a first-stage reverse osmosis membrane element as an example, the first-stage reverse osmosis membrane element is a roll-type membrane element which is manufactured by winding a plurality of membrane bags on a central water collecting pipe of engineering plastics with holes. Each membrane bag is composed of two membrane sheets which are opposite to each other, a layer of polyester fiber is clamped between the membrane sheets to weave a fresh water grid, 3 edges around the membrane sheets are sealed by epoxy or polyurethane adhesive, and the fourth edge is reserved as a water production channel to be connected with the central water collecting pipe. A plastic separation net is laid and clamped between two adjacent membrane bags to form a water inlet runner (water inlet grid). The inlet water enters the membrane element from one end of the membrane element along the inlet grid outside the membrane bag, part of the inlet water is used as the produced water to permeate the membrane, and the rest part of the inlet water is used as the concentrated water to be discharged from the other side of the membrane element. The produced water permeating the membrane enters the membrane bag, flows inwards in a spiral shape along the water production grid, enters the central water collecting pipe through the holes on the central pipe, and flows out through the water production outlet.

In this embodiment, referring to fig. 1, the electrode foil corrosion wastewater treatment system further includes aPLC control cabinet 17, thePLC control cabinet 17 is electrically connected to the pretreatment system 1, the tubular microfiltration membrane system 2, the two-stage reverse osmosis system, and the cleaning system, respectively, and the PLC control cabinet is used for controlling the working sequence of the pretreatment system 1, the tubular microfiltration membrane system 2, the two-stage reverse osmosis system, and the cleaning system. Therefore, the whole electrode foil corrosion wastewater treatment system is operated automatically, and the filtering, backwashing, chemical dosing backwashing and reverse osmosis are monitored by thePLC control cabinet 17 without manual reference, so that the operation is convenient.

Specifically, all valves, pumps, thedosing structure 14, the monitoring device and the like in the embodiment are electrically connected with thePLC control cabinet 17, and the operation sequence of each structure is controlled by thePLC control cabinet 17 in the whole process.

The invention also provides a treatment process of the electrode foil corrosion wastewater, which comprises the following steps:

s10: adjusting the pH value of the corrosion wastewater through the pretreatment system 1 and decomposing pollutants in the corrosion wastewater to form a concentrated solution;

s20: filtering the suspended particles in the concentrated solution in the step S10 through a tubular microfiltration membrane system 2 to form filtrate;

s30: desalting the filtrate by a two-stage permeation system;

In this embodiment, the electrode foil corrosion wastewater treatment process is used for treating the electrode foil corrosion wastewater, so that the effects of high effluent quality, stable effluent quality and long service life can be achieved.

Specifically, in this embodiment, step S10 includes the following steps:

s11: conveying the corrosion wastewater in thewastewater equalization tank 110 to the first reaction tank 120;

in this embodiment, since the corrosion wastewater is contained in thewastewater equalizing tank 110, the corrosion wastewater needs to be transported to the first reaction tank 120 by the lift pump.

S12: adjusting the PH of the wastewater in the first reaction tank 120;

s13: conveying the corrosion wastewater with the pH value adjusted in the first reaction tank 120 to thesecond reaction tank 130;

S14: the PH of the wastewater in thesecond reaction tank 130 is adjusted, and a regulating agent is added to decompose the contaminants in the wastewater to form a concentrated solution.

Specifically, in this embodiment, step S20 includes the following steps:

s21: the concentrated solution in thesecond reaction tank 130 is conveyed to aconcentration tank 3;

s22: the concentrated solution in theconcentration tank 3 is conveyed to the tubular microfiltration membrane system 2 through a circulatingpump 5 to be filtered by the tubular microfiltration membrane system 2;

wherein, at intervals, thePLC switch board 17 will control thefirst cleaning component 8 to wash the pair of tubular microfiltration membrane system 2, and when the concentrate concentration in theconcentration tank 3 is too high, thePLC switch board 17 control will be carried the concentrate to silt collecting pit 6 andpressure filter 7 and collect the processing. Namely, the concentrated solution is subjected to solid-liquid separation by the sludge collecting tank 6, the separated liquid can be sent to thewastewater equalizing tank 110 for retreatment, the sludge in the sludge collecting tank 6 and the sludge in the concentratingtank 3 can be squeezed by thefilter press 7 to form a recyclable filter cake, and the separated liquid can be sent to thewastewater equalizing tank 110 for retreatment.

In the present embodiment, step S30 includes the following steps:

s31: the filtrate is subjected to primary desalination and purification treatment through a primaryreverse osmosis component 9;

s32: the filtrate is subjected to secondary desalination and purification treatment through a secondaryreverse osmosis component 10.

In the present embodiment, step S31 includes the following steps: part of the concentrated water output by the first-stagereverse osmosis component 9 is conveyed back to the clearwater collecting tank 4, and part of the concentrated water is discharged; the step S32 includes the following steps: and conveying the concentrated water output by the secondaryreverse osmosis module 10 back to the clearwater collecting tank 4. The concentrated water enters the clearwater collecting tank 4 to form water circulation, so that the water in the first-stagereverse osmosis component 9 flows all the time, and the purpose of preventing the first-stagereverse osmosis component 9 from being blocked is achieved. When the concentration of the concentrated water output from the first-stageconcentrated water end 93 is high, theconcentrated water valve 19 is connected, the concentrated water is introduced into theconcentrated water tank 18 for subsequent treatment, and the concentrated water with high concentration is prevented from entering the clearwater collecting tank 4.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. Electrode foil corrodes effluent disposal system, its characterized in that includes:

2. The electrode foil corrosion wastewater treatment system of claim 1, further comprising a PLC control cabinet, wherein the PLC control cabinet is electrically connected with the pretreatment system, the tubular microfiltration membrane system, the two-stage reverse osmosis system and the cleaning system respectively, and is used for controlling the working sequence of the pretreatment system, the tubular microfiltration membrane system, the two-stage reverse osmosis system and the cleaning system.

3. The electrode foil corrosion wastewater treatment system of claim 1, wherein the pretreatment system comprises:

the waste water equalizing tank is used for containing corrosive waste water;

4. The electrode foil corrosion wastewater treatment system according to claim 1, further comprising a concentration tank and a clean water collection tank;

5. The electrode foil corrosion wastewater treatment system according to claim 4, wherein a sludge collecting tank is connected to the bottom of the concentrating tank for receiving the concentrated solution when the concentration of the concentrated solution in the concentrating tank is high, a filter press for pressing sludge in the sludge collecting tank into a filter cake is connected to the sludge collecting tank, the water outlet end of the filter press is connected to the wastewater equalizing tank, and the water outlet end of the sludge collecting tank is also connected to the wastewater equalizing tank.

6. The electrode foil corrosion wastewater treatment system of claim 4, wherein the cleaning system comprises a first cleaning assembly;

the first cleaning assembly includes:

7. The electrode foil corrosion wastewater treatment system according to claim 4, wherein the two-stage reverse osmosis system comprises a first-stage reverse osmosis module and a second-stage reverse osmosis module arranged in sequence;

8. The electrode foil corrosion wastewater treatment system of claim 7, wherein a cartridge filter for removing fine particles with turbidity higher than 1 degree is connected between the primary reverse osmosis assembly and the clean water collecting tank, and a dosing structure for adding a scale inhibitor into the filtrate is arranged on a water inlet pipe of the primary reverse osmosis assembly;

9. The electrode foil corrosion wastewater treatment system of claim 7, wherein the primary reverse osmosis module further has a primary concentrate end for outputting concentrate and being connectable to a concentrate tank or returning concentrate to the clean water collection tank;

10. The electrode foil corrosion wastewater treatment process, characterized in that the electrode foil corrosion wastewater treatment is performed by the electrode foil corrosion wastewater treatment system according to any one of claims 1 to 9, comprising the steps of:

s30: desalting the filtrate by a two-stage permeation system;

11. The electrode foil corrosion wastewater treatment process according to claim 10, wherein the step S20 includes the steps of:

s21: conveying the concentrated solution to a concentration tank;

12. The electrode foil etching wastewater treatment process as set forth in claim 10, comprising the steps of, in step S31: part of the concentrated water output by the first-stage reverse osmosis module is conveyed back to the clear water collecting pool, and part of the concentrated water is discharged; the step S32 includes the following steps: and conveying the concentrated water output by the secondary reverse osmosis component back to the clear water collecting tank.