CN215559437U - a waste water treatment system - Google Patents

Abstract

The utility model discloses a wastewater treatment system, comprising: the pretreatment system comprises a regulating tank, a high-density sedimentation tank, a multi-media filter and a sodium ion exchanger which are sequentially communicated, and is used for pretreating wastewater; the membrane treatment system is communicated with the pretreatment system and is used for desalting the wastewater; and the evaporative crystallization system is communicated with the membrane treatment system and is used for crystallizing and desalting the wastewater. The utility model thoroughly removes the hardness and turbidity in the wastewater through the pretreatment system, reduces the possibility of scaling of the membrane treatment system caused by concentrated water, prolongs the service life of the membrane treatment system, and simultaneously adopts the membrane treatment system to concentrate and reduce the wastewater subsequently entering the evaporative crystallization system, thereby greatly reducing the amount of water for evaporative crystallization desalination, and obviously reducing the operation cost and investment of evaporative crystallization desalination.

Description

Wastewater treatment system

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to a wastewater treatment system.

Background

Most domestic drinking water purification plants adopt traditional water treatment processes such as flocculation, sedimentation, filtration, chemical disinfection and the like, and the processes are usually only suitable for the condition that a high-quality water source is used as raw water. With the increasingly worsening of surface water quality and the continuous improvement of drinking water quality standards, the traditional water treatment process cannot meet the requirements of people on drinking water quality, and is difficult to effectively remove the conditions of high salinity, high hardness and the like in raw water. The membrane separation process with ultrafiltration and reverse osmosis as the core is introduced as the raw water advanced treatment process, so that not only can the total dissolved solids, hardness and sulfate ions in raw water be removed, the water quality of produced water be improved, but also the pollution of the water body in the water production process can be reduced, the effluent of a water purification plant can meet the national standard, and the increasingly higher requirements of people on the water quality can be met.

The main contaminants in concentrated wastewater produced during membrane treatment in water treatment plants include high concentrations of dissolved solids, turbidity and hardness. At present, the concentrated solution is mainly treated by the following two methods: 1) the method takes the discharge into a municipal sewage system as a main disposal mode, the waste water reuse rate is low, and the method cannot effectively utilize water resources for areas with deficient water resources and urgent need of water use, such as Shandong; 2) the concentrated wastewater is treated by a biological method and a physical and chemical method which are commonly used and have shown to be effective in related reports, but the problems of incomplete treatment (secondary concentrated solution generation), low utilization rate of wastewater resource and the like still exist.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a wastewater treatment system which realizes efficient purification of wastewater.

A wastewater treatment system according to an embodiment of the utility model includes: the pretreatment system comprises a regulating tank, a high-density sedimentation tank, a multi-media filter and a sodium ion exchanger which are sequentially communicated, and is used for pretreating wastewater; the membrane treatment system is communicated with the pretreatment system and is used for desalting the wastewater; the evaporative crystallization system is communicated with the membrane treatment system and is used for crystallizing and desalting wastewater.

The wastewater treatment system provided by the embodiment of the utility model has at least the following beneficial effects: the method has the advantages that the hardness and turbidity in the wastewater are thoroughly removed through the pretreatment system, the possibility of scaling of the membrane treatment system caused by concentrated water is reduced, the service life of the membrane treatment system is prolonged, meanwhile, the membrane treatment system is adopted to carry out concentration and decrement on the wastewater subsequently entering the evaporative crystallization system, and the water quantity for evaporative crystallization and desalination is greatly reduced, so that the operation cost and investment for evaporative crystallization and desalination are obviously reduced.

According to some embodiments of the utility model, the high density sedimentation tank comprises: the coagulation tank is communicated with the regulating tank and is provided with a first dosing tank for adding a coagulant; the hardness removal reaction tank is provided with a second medicine adding tank, and the second medicine adding tank is used for adding a hardness removal agent; the flocculation tank is provided with a third dosing tank, and the third dosing tank is used for adding a flocculating agent; the sedimentation tank is used for settling suspended matters in the wastewater; the coagulation tank, the hardness removal reaction tank, the flocculation tank and the sedimentation tank are communicated in sequence.

According to some embodiments of the utility model, the pretreatment system further comprises a sludge tank, the bottom of the sedimentation tank is provided with a sludge return pipe and a sludge discharge pipe, the sludge return pipe is communicated with the flocculation tank, and the sludge discharge pipe is communicated with the sludge tank.

According to some embodiments of the utility model, the multi-media filter comprises a filter material bed, and the filter material bed is provided with a smokeless coal layer, a quartz sand layer and a manganese sand layer from top to bottom in sequence.

According to some embodiments of the utility model, a membrane processing system comprises: the ultrafiltration device is communicated with the sodium ion exchanger and is used for removing colloid in the wastewater; the front reverse osmosis device and the rear reverse osmosis device are communicated in sequence, the two reverse osmosis devices are used for desalting wastewater, the front reverse osmosis device is communicated with the ultrafiltration device, and the rear reverse osmosis device is communicated with the evaporative crystallization system; and the reuse water tank is communicated with the output ends of the two groups of reverse osmosis devices.

According to some embodiments of the utility model, the ultrafiltration device comprises: the first filter is communicated with the sodium ion exchanger and is used for filtering suspended matters in the wastewater; the ultrafiltration membrane stack is used for filtering the colloid; an ultrafiltration water-producing tank; the first filter, the ultrafiltration membrane stack and the ultrafiltration water producing pool are communicated in sequence.

According to some embodiments of the utility model, the system further comprises a return pipe, wherein the return pipe is communicated with the ultrafiltration membrane stack and the regulating reservoir.

According to some embodiments of the utility model, the reverse osmosis apparatus comprises: the pipeline mixer is provided with a fourth dosing tank, and the fourth dosing tank is used for adding a reducing agent; a second filter; the reverse osmosis membrane stack comprises a concentrated water output pipe and a fresh water output pipe, the fresh water output pipe is communicated with the reuse water pool, and the reverse osmosis membrane stack is used for desalting wastewater; the pipeline mixer, the second filter and the reverse osmosis membrane stack are communicated in sequence.

According to some embodiments of the utility model, a concentrated water tank is communicated between the two groups of reverse osmosis devices, the reverse osmosis membrane stack of the former group of reverse osmosis devices is communicated with the input end of the concentrated water tank through a concentrated water output pipe, and the pipeline mixer of the latter group of reverse osmosis devices is communicated with the output end of the concentrated water tank.

According to some embodiments of the present invention, an evaporative crystallization system includes an evaporative crystallizer and a condensate connecting pipe, the condensate connecting pipe communicating the evaporative crystallizer and a conditioning tank.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view showing the overall flow of a wastewater treatment system according to this embodiment;

FIG. 2 is a schematic flow chart of the high-density sedimentation tank according to the present embodiment;

FIG. 3 is a schematic flow chart of the ultrafiltration apparatus of the present embodiment;

FIG. 4 is a schematic flow chart of two sets of reverse osmosis units according to the present embodiment;

reference numerals: apretreatment system 100; a regulatingreservoir 110; a highdensity settling tank 120; acoagulation tank 121; afirst dosing tank 121 a; a de-hardeningreaction tank 122; asecond dosing canister 122 a; aflocculation basin 123; athird dosing tank 123 a; asedimentation tank 124; asludge return conduit 125; asludge discharge pipe 126; amultimedia filter 130; asodium ion exchanger 140; asludge tank 150; amembrane processing system 200; anultrafiltration device 210; afirst filter 211; a stack ofultrafiltration membranes 212; an ultrafiltration water-producingtank 213; areturn pipe 214; areverse osmosis unit 220; aline mixer 221; afourth dosing tank 221 a; asecond filter 222; a reverseosmosis membrane stack 223; a concentratedwater output pipe 223 a; a freshwater output pipe 223 b; areuse water basin 230; a concentratedwater tank 240; anevaporative crystallization system 300; anevaporative crystallizer 310; the condensedwater connection pipe 320.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "lateral", "longitudinal", "vertical", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, 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 otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A wastewater treatment system according to an embodiment of the present invention, with reference to fig. 1, includes: thepretreatment system 100 comprises a regulatingreservoir 110, a high-density sedimentation reservoir 120, amulti-media filter 130 and asodium ion exchanger 140 which are sequentially communicated, wherein thepretreatment system 100 is used for pretreating wastewater, the wastewater enters the high-density sedimentation reservoir 120 after the wastewater is subjected to uniform water quality by the regulatingreservoir 110 so as to reduce the hardness, then enters themulti-media filter 130 through a lift pump so as to remove most suspended solids in the wastewater, the turbidity of the wastewater is further reduced, and finally the wastewater enters thesodium ion exchanger 140 so as to thoroughly remove the hardness in the water; themembrane treatment system 200 is communicated with thepretreatment system 100, and themembrane treatment system 200 is used for desalting the wastewater; theevaporative crystallization system 300 is communicated with themembrane treatment system 200, and theevaporative crystallization system 300 is used for crystallizing and desalting wastewater.

The wastewater treatment system provided by the embodiment of the utility model has at least the following beneficial effects: the method has the advantages that the hardness and turbidity in the wastewater are thoroughly removed through the pretreatment system, the possibility of scaling of the membrane treatment system caused by concentrated water is reduced, the service life of the membrane treatment system is prolonged, meanwhile, the membrane treatment system is adopted to carry out concentration and decrement on the wastewater subsequently entering the evaporative crystallization system, and the water quantity for evaporative crystallization and desalination is greatly reduced, so that the operation cost and investment for evaporative crystallization and desalination are obviously reduced.

In some embodiments of the present invention, referring to fig. 1 and 2, the high-density settling tank 120 includes: thecoagulation tank 121 is communicated with the regulatingtank 110, thecoagulation tank 121 is provided with afirst dosing tank 121a, and thefirst dosing tank 121a is used for adding a coagulant; the hardnessremoval reaction tank 122 is provided with a secondmedicine adding tank 122a, and the secondmedicine adding tank 122a is used for adding a hardness removal agent; theflocculation tank 123 is provided with athird dosing tank 123a, and thethird dosing tank 123a is used for adding a flocculating agent; asedimentation tank 124 for settling suspended matters in the wastewater; thecoagulation tank 121, the hardnessremoval reaction tank 122, theflocculation tank 123 and thesedimentation tank 124 are sequentially communicated along the wastewater treatment process. In this embodiment, the wastewater enters thecoagulation tank 121 from the regulatingtank 110 through a water pump, combines with the coagulant added in thefirst dosing tank 121a, and flows into the hardnessremoval reaction tank 122 after being rapidly stirred by the stirrer in thecoagulation tank 121; the wastewater is mixed with the hardness removing agent added in the secondmedicine adding tank 122a in the hardness removingreaction tank 122, and flows into theflocculation tank 123 through the connecting pipe and the guide pipe after being stirred; the wastewater is mixed with a flocculating agent added in a thirdmedicine adding tank 123a in theflocculation tank 123, and flows into thesedimentation tank 124 after being stirred; a high-density sludge suspension layer is arranged in thesedimentation tank 124, suspended matters generated in the wastewater through thecoagulation tank 121, the hardnessremoval reaction tank 122 and theflocculation tank 123 are compressed and precipitated by the high-density sludge suspension layer under the action of gravity by using a contact flocculation principle, and water flows into themulti-media filter 130 through a pipeline after mud-water separation. The high-density sedimentation tank 120 in this embodiment can sufficiently and efficiently remove suspended matters in water and reduce the hardness of wastewater, thereby ensuring the subsequent processes.

Preferably, the coagulant in the above embodiment is polyaluminium chloride, the hardness removing agent is lime or soda ash, and the flocculating agent is anionic polyacrylamide.

In some embodiments of the present invention, referring to fig. 1 and fig. 2, thepretreatment system 100 further includes asludge tank 150, the bottom of thesedimentation tank 124 is provided with asludge return pipe 125 and an externalsludge discharge pipe 126, thesludge return pipe 125 is communicated with theflocculation tank 123, the externalsludge discharge pipe 126 is communicated with thesludge tank 150, and the sludge at the bottom of thesedimentation tank 124 can flow back to theflocculation tank 123 through thesludge return pipe 125 to ensure the recycling of water, or flow into thesludge tank 150 through the externalsludge discharge pipe 126 to be recycled.

In some embodiments of the utility model, the multi-media filter comprises a filter material bed, and the filter material bed is provided with a smokeless coal layer, a quartz sand layer and a manganese sand layer from top to bottom in sequence. Preferably, in the embodiment, the anthracite has a relative density of 1.4-1.6 and a particle size of 0.8-1.8 mm; the relative density of the quartz sand is 2.6-2.65, and the particle size is 0.5-1.2 mm; the relative density of the manganese sand is 4.7-5.0, and the particle size is 2-4 mm. Through setting up the filter material bed of layering, can realize the filtration to different impurity to guarantee the filter effect ofmulti-media filter 130, satisfy multi-media filter's the requirement of outlet water turbidity.

In some embodiments of the present invention, referring to fig. 1, amembrane processing system 200 comprises: theultrafiltration device 210 is communicated with thesodium ion exchanger 140, and theultrafiltration device 210 is used for removing colloid in the wastewater; the two groups ofreverse osmosis devices 220 are sequentially communicated in the front and the back, the two groups ofreverse osmosis devices 220 are used for desalting wastewater, the front group ofreverse osmosis device 220 is communicated with theultrafiltration device 210, and the back group ofreverse osmosis device 220 is communicated with theevaporative crystallization system 300; thereuse water pool 230 is communicated with the output ends of the two groups ofreverse osmosis devices 220. In this embodiment, the wastewater is filtered by theultrafiltration device 210 and flows into the previousreverse osmosis device 220, the water separated by the membrane of the previousreverse osmosis device 220 flows into thereuse water tank 230, and the generated reverse osmosis concentrated water flows into the nextreverse osmosis device 220 for the second reverse osmosis treatment, so as to ensure that the salinity of the water is effectively reduced.

In some embodiments of the present invention, referring to fig. 1 and 3, theultrafiltration device 210 comprises: thefirst filter 211 is communicated with thesodium ion exchanger 140, thefirst filter 211 is a precision filter, and the wastewater treated by thepretreatment system 100 is filtered by thefirst filter 211 to filter particles and suspended matters possibly remaining in the water; anultrafiltration membrane stack 212 for removing contaminants such as colloids from the wastewater treated by thefirst filter 211; an ultrafiltration water-producingtank 213; thefirst filter 211, theultrafiltration membrane stack 212 and the ultrafiltrationproduct water tank 213 are communicated in sequence, and the wastewater after being subjected to membrane separation treatment by theultrafiltration membrane stack 212 is discharged into the ultrafiltrationproduct water tank 213. Preferably, theultrafiltration device 210 in this embodiment further includes a chemical cleaning device, the chemical cleaning device is connected to theultrafiltration membrane stack 212, and when the transmembrane pressure of theultrafiltration membrane stack 212 exceeds a certain value, the chemical cleaning device can perform chemical cleaning on theultrafiltration membrane stack 212 to ensure the stability of theultrafiltration membrane stack 212.

In some embodiments of the present invention, referring to fig. 1 and fig. 3, the present invention further includes areturn pipe 214, thereturn pipe 214 communicates theultrafiltration membrane stack 212 and theregulation tank 110, and the ultrafiltration concentrated water discharged from theultrafiltration membrane stack 212 flows back to theregulation tank 110 through thereturn pipe 214 to perform repeated pretreatment operations, so as to ensure the reuse of water.

In some embodiments of the present invention, referring to fig. 4, thereverse osmosis unit 220 comprises: thepipeline mixer 221, thepipeline mixer 221 is provided with afourth dosing tank 221a, and thefourth dosing tank 221a is used for adding a reducing agent; asecond filter 222; the reverseosmosis membrane stack 223 comprises a concentratedwater output pipe 223a and a freshwater output pipe 223b, the freshwater output pipe 223b is communicated with thereuse water pool 230, and the reverseosmosis membrane stack 223 is used for desalting wastewater; thepipeline mixer 221, thesecond filter 222, and the reverseosmosis membrane stack 223 are sequentially communicated, in this embodiment, the wastewater enters thepipeline mixer 221 and is mixed with the reducing agent, the detergent, and the like added by the fourth chemical addingtank 221a to prevent the salt in the concentrated water from scaling on the membrane surface, and the effluent of thepipeline mixer 221 enters the reverseosmosis membrane stack 223 through the compact filter and the booster pump to further perform the desalination treatment.

In some embodiments of the present invention, referring to fig. 4, a concentratedwater tank 240 is connected between two sets ofreverse osmosis devices 220, the reverseosmosis membrane stack 223 of the former set ofreverse osmosis device 220 is connected to the input end of theconcentrated water tank 240 through a concentratedwater output pipe 223a, thepipeline mixer 221 of the latter set ofreverse osmosis device 220 is connected to the output end of theconcentrated water tank 240, and the concentrated water of the former set of reverseosmosis membrane stack 223 is discharged into theconcentrated water tank 240 and then flows into thepipeline mixer 221 of the latter set to perform a second reverse osmosis treatment operation, so as to ensure sufficient purification of the wastewater.

In some embodiments of the present invention, referring to fig. 1, theevaporative crystallization system 300 includes anevaporative crystallizer 310 and a condensedwater connection pipe 320, the condensedwater connection pipe 320 communicates theevaporative crystallizer 310 and the regulatingreservoir 110, the concentrated water raw material generated by reverse osmosis in themembrane treatment system 200 is separated out, separated, dried and formed into crystallized salt through theevaporative crystallizer 310, the crystallized salt is transported to the outside for disposal, and the condensedwater connection pipe 320 formed during crystallization reflows to the regulatingreservoir 110 for recycling.

In the description herein, references to the description of "some embodiments" mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A wastewater treatment system, comprising:

the pretreatment system comprises a regulating tank, a high-density sedimentation tank, a multi-media filter and a sodium ion exchanger which are sequentially communicated, and is used for pretreating wastewater;

the membrane treatment system is communicated with the pretreatment system and is used for desalting the wastewater;

and the evaporative crystallization system is communicated with the membrane treatment system and is used for crystallizing and desalting the wastewater.

2. The wastewater treatment system of claim 1, wherein the high density settling tank comprises:

the coagulation tank is communicated with the regulating tank and is provided with a first dosing tank for adding a coagulant;

the hardness removal reaction tank is provided with a second medicine adding tank, and the second medicine adding tank is used for adding a hardness removal agent;

the flocculation tank is provided with a third dosing tank, and the third dosing tank is used for adding a flocculating agent;

the sedimentation tank is used for settling suspended matters in the wastewater;

the coagulation tank, the hardness removal reaction tank, the flocculation tank and the sedimentation tank are communicated in sequence.

3. The wastewater treatment system according to claim 2, wherein the pretreatment system further comprises a sludge tank, a sludge return pipe and a sludge discharge pipe are arranged at the bottom of the sedimentation tank, the sludge return pipe is communicated with the flocculation tank, and the sludge discharge pipe is communicated with the sludge tank.

4. The wastewater treatment system of claim 1, wherein the multi-media filter comprises a filter material bed, and the filter material bed is provided with a smokeless coal bed, a quartz sand layer and a manganese sand layer from top to bottom in sequence.

5. A wastewater treatment system according to claim 1, wherein said membrane treatment system comprises:

the ultrafiltration device is communicated with the sodium ion exchanger and is used for removing colloid in the wastewater;

the two groups of reverse osmosis devices are communicated in sequence from front to back, the two groups of reverse osmosis devices are used for desalting wastewater, the former group of reverse osmosis devices are communicated with the ultrafiltration device, and the latter group of reverse osmosis devices are communicated with the evaporative crystallization system;

and the reuse water tank is communicated with the output ends of the two groups of reverse osmosis devices.

6. The wastewater treatment system of claim 5, wherein the ultrafiltration device comprises:

the first filter is communicated with the sodium ion exchanger and is used for filtering suspended matters in the wastewater;

the ultrafiltration membrane stack is used for filtering the colloid;

an ultrafiltration water-producing tank;

the first filter, the ultrafiltration membrane stack and the ultrafiltration water producing pool are communicated in sequence.

7. The wastewater treatment system according to claim 6, further comprising a return pipe communicating the ultrafiltration membrane stack and the conditioning tank.

8. The wastewater treatment system of claim 5, wherein the reverse osmosis unit comprises:

the pipeline mixer is provided with a fourth dosing tank, and the fourth dosing tank is used for adding a reducing agent;

a second filter;

the reverse osmosis membrane stack is provided with a concentrated water output pipe and a fresh water output pipe, the fresh water output pipe is communicated with the reuse water pool, and the reverse osmosis membrane stack is used for desalting wastewater;

the pipeline mixer, the second filter and the reverse osmosis membrane stack are communicated in sequence.

9. The wastewater treatment system according to claim 8, wherein a concentrated water tank is arranged between two sets of the reverse osmosis devices, the reverse osmosis membrane stack of the former set of the reverse osmosis devices is communicated with the input end of the concentrated water tank through the concentrated water output pipe, and the pipeline mixer of the latter set of the reverse osmosis devices is communicated with the output end of the concentrated water tank.

10. The wastewater treatment system according to claim 1, wherein the evaporative crystallization system comprises an evaporative crystallizer and a condensate connecting pipe, and the condensate connecting pipe is communicated with the evaporative crystallizer and the regulating reservoir.

Images