CN105152414A - Reverse-osmosis concentrated water purifying treatment technology - Google Patents

Abstract

The invention provides a reverse-osmosis concentrated water purifying treatment technology. The technology comprises the steps that 1, a reverse-osmosis concentrated water lifting pump lifts concentrated water to a cooling tower; 2, the concentrated water flows into a pre-reaction tank after being cooled by the cooling tower, and PAC, PAM and sodium hypochlorite are added into the pre-reaction tank to carry out flocculation and oxidation pre-reaction; 3, the product enters a mechanical accelerating clarification tank, sodium hydroxide and sodium carbonate are added to carry out a softening reaction, and hydrochloric acid is added into a clear liquid tank of the mechanical accelerating clarification tank to adjust a pH value of clear liquid to be 6-9; 4, the clear liquid in the mechanical accelerating clarification tank flows to a rapid filter through a pipeline to further reduce the content of a suspended solid; 5, produced water in the filter is lifted to a softening device through the lifting pump to further reduce hardness of the concentrated water; 6, the softened produced water is pressurized through an ultra-filtration lifting pump, and then enters an ultra-filtration filter membrane through a self-cleaning filter; 7, a back washing water lifting pump pressurizes the ultra-filtered produced water and then supplies the water to the rapid filter, the softening device and the ultra-filtration membrane so that the produced water can serve as back washing water.

Description

A kind of reverse osmosis concentrated water purification process technique

Technical field

The invention belongs to water technology, be specifically related to a kind of reverse osmosis concentrated water purification process technique.

Background technology

At present, reverse osmosis technology is widely used in multiple fields such as oil, chemical industry, metallurgy, electric power, electronics, pharmacy, food, Treated sewage reusing, becomes one of technology important in water treatment procedure.In reverse osmosis system, according to the difference of water quality and the water yield, the recycling of a large amount of high density reverse osmosis concentrated water becomes the technology barrier of reverse osmosis technology application, and how recycling reverse osmosis concentrated water becomes important technological problems in water treatment process.

Chinese patent CN201210383019.X discloses a kind of reuse treatment process of reverse osmosis concentrated water, adopts electrodialytic Treatment for Reuse reverse osmosis concentrated water.Its weak point is that ratio of desalinization is not high, and Reuse Range is limited, and energy expenditure is large, obviously improper to large-scale reverse osmosis concentrated water treatment.

Summary of the invention

The object of the invention is the problem not being suitable for large-scale industrial application for the reverse osmosis concentrated water treatment existed in prior art, provides a kind of reverse osmosis concentrated water purification process technique of energy-saving and environmental protection.

The technical scheme of invention:

A kind of reverse osmosis concentrated water purification process technique, comprises following processing step:

(1) reverse osmosis concentrated water is promoted to cooling tower, by dense water cooling to less than 35 DEG C by dense water lift pump.

(2) cooled reverse osmosis concentrated water fully mixes with PAC, PAM and clorox and carries out flocculating and oxidizing reaction in pre-reaction pond.

(3) in pre-reaction pond through the reverse osmosis concentrated water of fully reaction from flowing to mechanical accelerating purifying pool, and in mechanical accelerating purifying pool reaction chamber, add tenderizer sodium hydroxide, sodium carbonate removes calcium, magnesium plasma in dense water.Under 50 ~ 450rpm mixing speed, reverse osmosis concentrated water and tenderizer carry out abundant hybrid reaction in reaction zone; Then carry out mud-water separation in separate chamber, body refuse enters body refuse enrichment region and is discharged by shore pipe, and clear liquid is flowed out outside pond by water leg and rising pipe, and adds hydrochloric acid in water leg, regulates clear liquid pH=6.0 ~ 9.Clear liquid hardness is 30 ~ 200mg/L, and suspended sediment concentration is 10 ~ 30mg/L.

(4) the clear liquid gravity flow of mechanical accelerating purifying pool enters rapid filter, and further except the suspended solids in anhydrating, it is 5 ~ 15mg/L that aqueous suspension solids concn is produced in fast filter.

(5) rapid filter produces water and enters fast filter product pond, join softening agent by lift pump by filtering product water soon, the calcium magnesium plasma further in removing fast filter product water, after reducing its hardness, softening agent produces water and enters ultrafiltration pump sump, and it is 5 ~ 15mg/L that softening agent produces the water hardness.

(6) water in ultrafiltration pump sump by after the supercharging of ultrafiltration lift pump through self-cleaning filter laggard enter ultra-filtration membrane group.

(7) the product water of ultra-filtration membrane group enter ultrafiltration produce pond carry out degree of depth Treatment for Reuse.Backwash water lift pump ultrafiltration is produced water extraction rise deliver to rapid filter respectively, softening agent, ultra-filtration membrane group carry out backwash.

The present invention adopts cooling tower cooling, pre-reaction, mechanical accelerating purifying pool removes firmly, rapid filter removes suspended solids, the softening agent degree of depth removes hard, ultra-filtration membrane combination process, efficiently solve the problem of reverse osmosis concentrated water discharge environmental pollution, and the water conditioning after purification, meet the inflow requirement of reverse osmosis advanced process.

Accompanying drawing explanation

Fig. 1 is reverse osmosis concentrated water purification process technique schema.

Embodiment

Front by reference to the accompanying drawings technical process and embodiment further illustrates.

Embodiment 1:

A kind of reverse osmosis concentrated water purification process technique, comprises following processing step:

(1) reverse osmosis concentrated pond water quality TDS is about 5000mg/L, and hardness is about 400mg/L, and temperature is about 48 DEG C, is promoted to cooling tower carries out air-cooled by dense water lift pump, is water-cooled to less than 35 DEG C by reverse osmosis concentrated.

(2) reverse osmosis concentrated water certainly flow to pre-reaction pond after cooling tower cooling, PAC, PAM flocculation agent is added in pre-reaction pond, under the effect of flocculation agent, throw out is assembled larger, add oxidizing agent sodium hypochlorite, under the effect of oxygenant, colloidalmaterial, bacterium etc. are oxidized, enter mechanical accelerating purifying pool together after sufficient reacting.

(3) reaction chamber in mechanical accelerating purifying pool adds sodium hydroxide, sodium carbonate, and material contact evenly under stirring, and reaction thoroughly, makes the divalent ions such as calcium magnesium form precipitation, and reduces the hardness in water.Add hydrochloric acid adjustment PH to 6 ~ 9 in clear liquid in water collecting basin, enter rapid filter by rising pipe.Clear liquid water hardness is 200mg/L, and suspended solids is 30mg/L.

(4) mechanical accelerating purifying pool clear liquid by during rapid filter further except the suspended solids in anhydrating, rapid filter produces aqueous suspension solids concn and is down to 15mg/L.

(5) fast filter is produced water and is entered fast filter and produce pond and collect, softening agent is delivered to by filtering the supercharging of product water lift pump soon, calcium magnesium plasma in water and the sodium ion in softening agent ion exchange resin are replaced, reach the object reducing the dense water hardness further, the product water of softening agent enters ultrafiltration pump sump and collects.Softening agent produces the water hardness and is reduced to 15mg/L.

(6) water extraction of ultrafiltration pump sump is risen to 10 μm of self-cleaning filters by ultrafiltration lift pump, processes through entering ultra-filtration membrane group except the suspended solid impurities in anhydrating is laggard further.The product water of ultra-filtration membrane group enters ultrafiltration and produces pond collection for the reverse osmosis advanced Treatment for Reuse of back segment, and ultrafiltration is produced water water hardness and is about 1mg/L.

(7) backwash water lift pump ultrafiltration is produced water extraction rise deliver to rapid filter respectively, softening agent, ultra-filtration membrane group carry out backwash.

Embodiment 2:

A kind of reverse osmosis concentrated water purification process technique, comprises following processing step:

(1) reverse osmosis concentrated pond water quality TDS is about 4000mg/L, and hardness is about 300mg/L, and temperature is about 45 DEG C, is promoted to cooling tower carries out air-cooled by dense water lift pump, is water-cooled to less than 35 DEG C by reverse osmosis concentrated.

(2) reverse osmosis concentrated water certainly flow to pre-reaction pond after cooling tower cooling, PAC, PAM flocculation agent is added in pre-reaction pond, under the effect of flocculation agent, throw out is assembled larger, add oxidizing agent sodium hypochlorite, under the effect of oxygenant, colloidalmaterial, bacterium etc. are oxidized, enter mechanical accelerating purifying pool together after sufficient reacting.

(3) reaction chamber in mechanical accelerating purifying pool adds sodium hydroxide, sodium carbonate, and material contact evenly under stirring, and reaction thoroughly, makes the divalent ions such as calcium magnesium form precipitation, and reduces the hardness in water.Add hydrochloric acid adjustment PH to 6 ~ 9 in clear liquid in water collecting basin, enter rapid filter by rising pipe.Clear liquid water hardness is 100mg/L, and suspended solids is 20mg/L.

(4) mechanical accelerating purifying pool clear liquid by during rapid filter further except the suspended solids in anhydrating, rapid filter produces aqueous suspension solids concn and is down to 10mg/L.

(5) fast filter is produced water and is entered fast filter and produce pond and collect, softening agent is delivered to by filtering the supercharging of product water lift pump soon, calcium magnesium plasma in water and the sodium ion in softening agent ion exchange resin are replaced, reach the object reducing the dense water hardness further, the product water of softening agent enters ultrafiltration pump sump and collects.Softening agent produces the water hardness and is reduced to 10mg/L.

(6) water extraction of ultrafiltration pump sump is risen to 10 μm of self-cleaning filters by ultrafiltration lift pump, processes through entering ultra-filtration membrane group except the suspended solid impurities in anhydrating is laggard further.The product water of ultra-filtration membrane group enters ultrafiltration and produces pond collection for the reverse osmosis advanced Treatment for Reuse of back segment, and ultrafiltration is produced water water hardness and is about 1mg/L.

(7) backwash water lift pump ultrafiltration is produced water extraction rise deliver to rapid filter respectively, softening agent, ultra-filtration membrane group carry out backwash.

Embodiment 3:

A kind of reverse osmosis concentrated water purification process technique, comprises following processing step:

(1) reverse osmosis concentrated pond water quality TDS is about 3000mg/L, and hardness is about 250mg/L, and temperature is about 48 DEG C, is promoted to cooling tower carries out air-cooled by dense water lift pump, is water-cooled to less than 35 DEG C by reverse osmosis concentrated.

(2) reverse osmosis concentrated water certainly flow to pre-reaction pond after cooling tower cooling, PAC, PAM flocculation agent is added in pre-reaction pond, under the effect of flocculation agent, throw out is assembled larger, add oxidizing agent sodium hypochlorite, under the effect of oxygenant, colloidalmaterial, bacterium etc. are oxidized, enter mechanical accelerating purifying pool together after sufficient reacting.

(3) reaction chamber in mechanical accelerating purifying pool adds sodium hydroxide, sodium carbonate, and material contact evenly under stirring, and reaction thoroughly, makes the divalent ions such as calcium magnesium form precipitation, and reduces the hardness in water.Add hydrochloric acid adjustment PH to 6 ~ 9 in clear liquid in water collecting basin, enter rapid filter by rising pipe.Clear liquid water hardness is 30mg/L, and suspended solids is 10mg/L.

(4) mechanical accelerating purifying pool clear liquid by during rapid filter further except the suspended solids in anhydrating, rapid filter produces aqueous suspension solids concn and is down to 5mg/L.

(5) fast filter is produced water and is entered fast filter and produce pond and collect, softening agent is delivered to by filtering the supercharging of product water lift pump soon, calcium magnesium plasma in water and the sodium ion in softening agent ion exchange resin are replaced, reach the object reducing the dense water hardness further, the product water of softening agent enters ultrafiltration pump sump and collects.Softening agent produces the water hardness and is reduced to 5mg/L.

(6) water extraction of ultrafiltration pump sump is risen to 10 μm of self-cleaning filters by ultrafiltration lift pump, processes through entering ultra-filtration membrane group except the suspended solid impurities in anhydrating is laggard further.The product water of ultra-filtration membrane group enters ultrafiltration and produces pond collection for the reverse osmosis advanced Treatment for Reuse of back segment, and ultrafiltration is produced water water hardness and is about 1mg/L.

(7) backwash water lift pump ultrafiltration is produced water extraction rise deliver to rapid filter respectively, softening agent, ultra-filtration membrane group carry out backwash.

Claims (1)

1. a reverse osmosis concentrated water purification process technique, comprises following processing step:

(1) reverse osmosis concentrated water is promoted to cooling tower, by dense water cooling to less than 35 DEG C by dense water lift pump;

(2) cooled reverse osmosis concentrated water fully mixes with PAC, PAM and clorox and carries out flocculating and oxidizing reaction in pre-reaction pond;

(3) certainly mechanical accelerating purifying pool is flow to through the reverse osmosis concentrated water of fully reaction in pre-reaction pond, and in mechanical accelerating purifying pool reaction chamber, add tenderizer sodium hydroxide, sodium carbonate removes calcium, magnesium plasma in dense water, under 50 ~ 450rpm mixing speed, reverse osmosis concentrated water and tenderizer carry out abundant hybrid reaction in reaction zone; Then carry out mud-water separation in separate chamber, body refuse enters body refuse enrichment region and is discharged by shore pipe, and clear liquid flows out outside pond by water leg and rising pipe, adds hydrochloric acid in water leg, regulates clear liquid pH=6.0 ~ 9; Clear liquid hardness is 30 ~ 200mg/L, and suspended sediment concentration is 10 ~ 30mg/L;

(4) the clear liquid gravity flow of mechanical accelerating purifying pool enters rapid filter, and further except the suspended solids in anhydrating, it is 5 ~ 15mg/L that aqueous suspension solids concn is produced in fast filter;

(5) rapid filter produces water and enters fast filter product pond, join softening agent by lift pump by filtering product water soon, the calcium magnesium plasma further in removing fast filter product water, after reducing its hardness, softening agent produces water and enters ultrafiltration pump sump, and it is 5 ~ 15mg/L that softening agent produces the water hardness;

(6) water in ultrafiltration pump sump by the supercharging of ultrafiltration lift pump, self-cleaning filter coarse filtration laggard enter ultra-filtration membrane group;

(7) the product water of ultra-filtration membrane group enter ultrafiltration produce pond carry out degree of depth Treatment for Reuse; Backwash water lift pump ultrafiltration is produced water extraction rise deliver to rapid filter respectively, softening agent, ultra-filtration membrane group carry out backwash.