CN208120896U - Can resource recycling power plant desulfurization wastewater zero discharge treatment device - Google Patents

Can resource recycling power plant desulfurization wastewater zero discharge treatment device Download PDF

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CN208120896U
CN208120896U CN201820377515.7U CN201820377515U CN208120896U CN 208120896 U CN208120896 U CN 208120896U CN 201820377515 U CN201820377515 U CN 201820377515U CN 208120896 U CN208120896 U CN 208120896U
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tank
membrane module
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concentration
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蒋林煜
王舒东
方艺明
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Xiamen Jiarong Technology Co Ltd
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Xiamen Jiarong Technology Co Ltd
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Abstract

The utility model disclose it is a kind of can resource recycling power plant desulfurization wastewater zero discharge treatment device, including three headers, clarifying basin, reaction tank, concentration water tank, sludge concentration tank, plate and frame filter press, tubular type UF membrane module, nanofiltration membrane component, RO membrane module and bipolar membrane electrodialysis system;Three headers include sequentially connected neutralization case, reaction chamber and flocculation tanks, flocculation tanks connect clarifying basin, clarifying basin connects reaction tank, reaction tank connects concentration water tank, concentration water tank sludge outlet connects sludge concentration tank, sludge concentration tank outlet connects plate and frame filter press, water tank production water is concentrated and passes through elevator pump take-over type UF membrane module, tubular type UF membrane module produces water and connects nanofiltration membrane component, tubular type UF membrane module concentrated water connects concentration water tank, nanofiltration membrane component produces water and connects RO membrane module, nanofiltration membrane component concentrated water connects reaction tank, RO membrane module produces water and connects outer comb, RO membrane module concentrated water connects bipolar membrane electrodialysis system.The device realizes the depth zero discharge treatment of the desulfurization wastewater of power plant and realizes resource recycling.

Description

Can resource recycling power plant desulfurization wastewater zero discharge treatment device
Technical field
The utility model relates to power plant desulfurization wastewater processing technology field, refer in particular to it is a kind of can resource recycling electricity Factory's desulfurization wastewater zero discharge treatment device.
Background technique
Existing power plant desulfurization wastewater treatment process has:
Electric field desulfurization wastewater low consumption Zero discharge treatment method disclosed in patent 1 (201710412099.X), by useless Water is pre-processed, and sodium hydroxide, sodium carbonate, sodium hypochlorite is added, and removes divalent and trivalent scale-forming ion in desulfurization wastewater With inhibition microbial growth;It is separated by solid-liquid separation again with tubular ultra-filtration membrane;Then desulfurization wastewater is concentrated using nanofiltration, into One step removes divalent and trivalent scale-forming ion in desulfurization wastewater;Then nanofiltration produces water and carries out reverse osmosis process processing;Again to height The concentration of concentration sodium chloride solution heating evaporation;Last strong brine condensing crystallizing dehydration, drying.
1 scheme defect of patent is:Heavy metal chelating agent is not added in pretreatment stage, cannot remove hydroxide without The heavy metal ion of method precipitating removal;Joined sodium hypochlorite, if additional amount control is improper, be easy to subsequent nano-filtration film and RO film damages;Evaporation gained solid sodium chloride purity is not high, can not transport outward or sell, also using little in field, therefore It is worth not high;Pretreatment needs additional addition soda acid, consumes medicament.
A kind of zero emission treatment of desulfured waste water disclosed in patent 2 (201611024049.6), including:
Electric flocculation:Desulfurization wastewater electric flocculation caused by producing removes partial organic substances, ss and heavy metal;
Double alkali chemical tenderings:Electric flocculation organic matter produced is entered into double alkali chemical settlings;
Tubular membrane ultrafiltration:Water body after sedimentation carries out readjustment pH using the acid of Bipolar Membrane output, is allowed to keep micro- Alkalinity;
Nanofiltration membrane:Using nanofiltration, the divalent salts removal in water body is realized and divides salt;
ED concentration:The salt water of purifying is then concentrated into homogeneous ED, the dense salt after concentration and separation discharge of cutting off the water supply;
Prepare soda acid;Salt water after concentration prepares soda acid, the soda acid of preparation is used for by BPED bipolar membrane electrodialysis system Double alkali softenings and other production applications in step 2.
2 method defect of patent is:Electrocoagulation electrode is easily passivated, and energy consumption is high, and consumption of electrode is fast, leads to operating cost liter It is high;Desalination rate, the rate of recovery of ED concentration are lower;ED clean and maintenance is frequently complicated;Power plant desulfurization wastewater monovalent salt after nanofiltration Content is still very high, and ED energy consumption is big.
A kind of desulfurization wastewater Zero-discharge treating process disclosed in patent 3 (201510529034.4), including:
Step 1: in and the medical fluid centainly measured is added in conditioning tank, so that most heavy metal ion are in alkaline environment The middle hydroxide precipitating for generating indissoluble;
Step 2: after medicament is added in desulfurization wastewater when pH value reaches 9.0 to 9.5, most of equal shapes of heavy metal ion Ca2+ at the hydroxide of indissoluble, while in water can also be reacted with the part F- in waste water, generate the CaF2 precipitating of indissoluble And have the function that fluorine removal;
Step 3: flocculation sedimentation, makes colloidal solid and suspended particulate that cohesion and aggregation occur, flocculant, which is added, keeps medical fluid anti- Should sufficiently, after precipitating the regular hour, the top of flocculation sedimentation tank is supernatant, and its underpart is dope;
Step 4: solid waste is discharged and waste water, waste water pass through after lower dope is by sludge condensation case and sheet frame sludge filter press Pipeline, which imports, neutralizes conditioning tank, is recycled and is handled again.Supernatant is effectively removed in waste water by full-automatic softening filter Calcium ion, the purpose is to protect the reverse osmosis unit in subsequent processing;Demineralizer has the effect of filtering concurrently simultaneously;
Step 5: ultrafilter automatic backwash in the process of running, ensure that and be not contaminated;
Step 6: crystal salt is made by I and II RO reverse osmosis and crystallizing evaporator in concentrated water, improved by reverse osmosis concentration Salinity in waste water, saves energy consumption on evaporative crystallization;The purified water reuse generated through reverse osmosis concentration.
The defect of patent 3 is as follows:There is no nanofiltration membrane to carry out a point salt, be directly concentrated with RO, causes RO system pressure higher, it is dense Contracting liquid evaporation gained crystal salt is impure.Evaporation gained solid sodium chloride purity is not high, can not transport outward or sell, also apply in field It is little, therefore be worth not high;Pretreatment needs additional addition soda acid, consumes medicament.
A kind of power plant desulfurization wastewater technique of zero discharge disclosed in patent 4 (201610901996.2), including:
Step 1: power plant desulfurization wastewater initially enters raw water box, homogeneous adjusting is carried out in raw water box, protects waste water quality It holds relatively stable;
Step 2: raw water box water outlet enters the first flocculation reaction slot, flocculant and macromolecule are added in the first flocculation tank Polymer flocculation, the waste water after the flocculation of the first flocculation reaction slot enters the first precipitation tank, in the waste water of the first precipitation tank The floc sedimentation of middle formation is down to slot bottom and forms sludge, is sent into sludge holding tank, then send to sludge concentration tank, and the sludge after concentration enters Filter press dehydration, mud cake are sent to designated place landfill, and filtrate returns to sludge concentration tank;
Step 3: enter UF ultrafiltration system to the supernatant of the first precipitation tank, further remove jelly in waste water and Macromolecule organic;
Step 4: water outlet, which enters NF sodium, filters system, concentrated water enters the second flocculation reaction slot;
Step 5: sodium filter system water outlet enters RO counter-infiltration system, concentrated water enters the second flocculation reaction slot;
Step 6: it is mainly NaOH, Na2CO3 and Polymer, dosing that chemical agent is added in the second flocculation reaction slot Amount is in 1-5ppm;Concentrated water after flocculation enters the second precipitation tank, and precipitation tank bottom sludge enters sludge concentration tank, and water outlet enters the One decompression evaporator, evaporation output Na2SO4, send to the first centrifuge and is separated by solid-liquid separation, obtain Na2SO4 crystal, filtrate portion Divide and be back to evaporator, remaining enters drying machine, forms sludge cake, the sludge cake of formation send to designated place and fills, dried The steam containing pollutant that journey generates enters scrubbing tower, and washing water returns to raw water box;
Step 7: RO counter-infiltration system produces water as recycle-water reuse, concentrated water enters the second decompression evaporator, and evaporation is precipitated NaCl send to the second centrifuge and is separated by solid-liquid separation, and obtains NaCl crystal, and filtrate portion is back to evaporator, remaining enters dry Dry machine forms sludge cake, landfill.
The defect of patent 4 is as follows:Flocculant and high molecular polymer are added in preprocessing process, if dosage control is not It is good, subsequent ultrafiltration and nanofiltration system can be polluted;Due to having added part chemical agent before evaporation, it is easy to cause evaporator heat exchange Device fouling influences the heat transfer efficiency of evaporator;Mud cake after evaporation needs to reprocess, and cannot achieve the utilization of resources;Pretreatment needs Soda acid is additionally added, medicament is consumed.
Utility model content
The utility model aim be to provide can resource recycling power plant desulfurization wastewater zero discharge treatment device, realize The processing of desulfurization wastewater procedure and resource reclaim.
In order to achieve the above objectives, the solution of the utility model is:
Can resource recycling power plant desulfurization wastewater zero discharge treatment device, including three headers, clarifying basin, reaction tank, Water tank, sludge concentration tank, plate and frame filter press, tubular type UF membrane module, nanofiltration membrane component, RO membrane module and bipolar membrane electrodialysis is concentrated System;Wherein three headers include that sequentially connected neutralization case, reaction chamber and flocculation tanks, the flocculation tanks connect clarifying basin, clarifying basin Reaction tank is connect, reaction tank connects concentration water tank, and concentration water tank sludge outlet connects sludge concentration tank, and sludge concentration tank exports fishplate bar frame pressure Filter, concentration water tank produce water by elevator pump take-over type UF membrane module, and tubular type UF membrane module produces water and meets nanofiltration membrane component, tubular type UF Membrane module concentrated water connects concentration water tank, and nanofiltration membrane component produces water and connects RO membrane module, and nanofiltration membrane component concentrated water connects reaction tank, RO membrane module It produces water and connects outer comb, RO membrane module concentrated water connects bipolar membrane electrodialysis system.
The nanofiltration membrane component is rolled structure.
The RO membrane module uses high voltage bearing disc tube reverse osmosis (dt-ro) membrane module DTRO, MTRO or STRO.
After adopting the above scheme, the utility model has the following advantages that:
(1) use three headers, double alkali softening+tubular type ultrafiltration two-stage hardness removing process, preferably capture and go removing heavy metals, Hardness is removed, low energy consumption, and operating cost is low, realizes that the desulfurization wastewater of coal-burning power plant carries out depth zero discharge treatment, and sufficiently benefit The sodium chloride contained with waste water is directly prepared into the acid/base of recoverable.
(2) nanofiltration can retain multivalent ion, obtain and enter RO with NaCl production water as main component, alleviate to RO The burden of concentration and the risk of fouling.
(3) RO further reduces the amount of concentrate, improves salt concentration in favor of bipolar film preparation soda acid, reduces The power consumption of bipolar film preparation soda acid.Water is produced after RO concentration can be with reuse, and producing water compared to ED concentration technology, often salt content is also higher, Can not direct reuse, need further desalination could reuse.Therefore high pressure RO concentration technology is used, system integrated artistic is simpler It is clean.
(4) sodium chloride contained using waste water is directly prepared into available acid/base, and manufactured alkali is removed for Dual alkali Firmly, acid obtained is for the pH readjustment before nanofiltration, and soda acid more than needed can also be used in other water treatment systems of power plant itself.
Detailed description of the invention
Fig. 1 is the power plant desulfurization wastewater Zero-discharge treating process flow chart of the utility model;
Fig. 2 is the utility model power plant desulfurization wastewater zero discharge treatment apparatus structure block diagram.
Label declaration
In three liang of casees 10 and case 101
102 flocculation tanks 103 of reaction chamber
20 reaction tank 30 of clarifying basin
40 sludge concentration tank 50 of water tank is concentrated
60 tubular type UF membrane module 70 of plate and frame filter press
80 RO membrane module 90 of nanofiltration membrane component
Bipolar membrane electrodialysis system 100
Specific embodiment
The utility model is described in detail below in conjunction with drawings and the specific embodiments.
As shown in Fig. 2, the present embodiment disclose can resource recycling power plant desulfurization wastewater zero discharge treatment device, packet Include three headers 10, clarifying basin 20, reaction tank 30, concentration water tank 40, sludge concentration tank 50, plate and frame filter press 60, tubular type UF film group Part 70, nanofiltration membrane component 80, RO membrane module 90 and bipolar membrane electrodialysis system 100;Wherein three headers 10 include sequentially connected Case 101, reaction chamber 102 and flocculation tanks 103 are neutralized, flocculation tanks 103 connect clarifying basin 20, clarifying basin 20 connects reaction tank 30, reaction tank 30 connect concentration water tank 40, and concentration 40 sludge outlet of water tank connects sludge concentration tank 50, and the outlet of sludge concentration tank 50 connects plate and frame filter press 60, concentration water tank 40 produces water by elevator pump take-over type UF membrane module 70, and tubular type UF membrane module 70 produces water and connects nanofiltration membrane component 80, 70 concentrated water of tubular type UF membrane module connects concentration water tank 40, and nanofiltration membrane component 80 produces water and connects RO membrane module 90,80 concentrated water of nanofiltration membrane component Reaction tank 30 is connect, RO membrane module 90 produces water and connects outer comb, and 90 concentrated water of RO membrane module connects bipolar membrane electrodialysis system 100.
Please refer to shown in Fig. 1 and 2, the present embodiment disclose can resource recycling power plant desulfurization wastewater zero discharge treatment Device includes the following steps:
The pretreatment of (1) three header:Waste water is pumped into and neutralizes case 101, adds Ca (OH) in and in case 1012, by wastewater pH 7~9 are adjusted to, then overflow enters reaction chamber 102, organic sulfur is added in reaction chamber 102 with precipitation of heavy metals ion (such as mercury With cadmium etc.), flocculant FeClSO is added in reaction chamber overflow to flocculation tanks 103 in flocculation tanks 1034, then flow into clarifying basin 20, precipitation and separation is come out and obtains clarified solution;
For the organic sulfur that the present embodiment uses for TMT-15 water treatment agent, ingredient contains tri-thiol, triazine trisodium salt, is a kind of High-tech water treatment agent.The product can at normal temperature in waste water various heavy metal ion (mercury, lead, copper, cadmium, nickel, manganese, Zinc, chromium etc.) reaction rapidly, chelate not soluble in water, and that there is good chemical stability is generated, to reach capture removal The purpose of heavy metal.
(2) Dual alkali is except hard:Clarified solution flows into reaction tank 30, in by clarified solution and mass concentration being 1.8- in reaction tank 30 2.3% lime reaction, after reacted with coagulation liquid status with mass concentration for the soda ash of 2.0-2.5%, after with coagulation liquid status Into concentration water tank 40, the concentration regular outlet sludge of water tank 40 arrives sludge concentration tank 50, into plate and frame filter press after sludge condensation 60 filters pressings are processed into mud cake, and mud cake is periodically transported outward or utilized, this step further removes the divalent such as the calcium and magnesium in desulfurization wastewater And trivalent scale-forming ion;The dosage of lime and soda ash enters Ca in the water quality of tubular type UF membrane module according to waste water2+Control exists 450-650mg/L,Mg2+Control is in 200-600mg/L.
(3) tubular type UF ultrafiltration:Concentration water tank 40 produces water and enters tubular type UF membrane module 70 by elevator pump (not shown), Molecular cut off is ten thousand Dalton of 10-25, and operating pressure 1-6bar, tubular membrane flow diameter is 6-12mm, after filtering coagulation Suspended matter, separating clarifying obtain ultrafiltration produce water, ultrafiltration concentrate recirculation to concentration water tank 40;
(4) nanofiltration:Ultrafiltration produces water and carries out readjustment pH with the acid of 100 output of bipolar membrane electrodialysis system, is allowed to keep slightly sour Property after with nanofiltration membrane component 80 carry out a point salt, nanofiltration membrane retention divalent salts and TOC (total organic carbon) are contained through sodium chloride Nanofiltration based on monovalent sodium chloride salt produces water and enters RO membrane module 90 (reverse osmosis membrane assembly) and handles, nanofiltration concentrated water return step (2) reaction tank 30 removes hardness;In this step, nanofiltration membrane uses rolled structure, and proof pressure 0-75bar retains molecule Amount is 100-400Dalton.
(5) reverse osmosis:Nanofiltration produces water and enters online booster pump by the pressurized feed liquid of booster pump, is further pressurized laggard Enter RO membrane module 90, water is produced to nanofiltration with RO membrane module 90 and is further concentrated, RO produces water discharge or reuse;In this step, High voltage bearing disc tube reverse osmosis (dt-ro) membrane module DTRO, MTRO or STRO can be used in RO membrane module 90, and RO membrane module operating pressure is Salt content can be concentrated to 100-150g/L from 30-40g/L by 40-120bar;Reverse osmosis dialyzate can qualified discharge, or Reuse and production or configuration medicament water.
(6) soda acid recycles:RO concentrated water obtains sodium hydroxide and hydrochloric acid, the alkali of preparation by bipolar membrane electrodialysis system 100 For alkali softenings double in step (2), gained acid is used into before nanofiltration adjust back pH, while the soda acid prepared can also be used for and other lifes It produces in application.
The power plant desulfurization wastewater Zero-discharge treating process of the utility model has the following advantages that:
A. three headers, double alkali softening+tubular type ultrafiltration two-stage hardness removing process are used, preferably captures and goes removing heavy metals, go Except hardness, low energy consumption, and operating cost is low;
B. reagent consumption is reduced, is provided simultaneously without additional addition soda acid using the acid/base generated with process unit itself Source is adequately and reasonably used;
C. nanofiltration, RO concentration are used cooperatively with bipolar membrane electrodialysis.Nanofiltration can retain multivalent ion, obtain with NaCl Production water as main component enters RO, and the burden of concentration and the risk of fouling are alleviated to RO, and RO further reduces concentration The amount of liquid improves salt concentration in favor of bipolar film preparation soda acid, reduces the power consumption of bipolar film preparation soda acid;
Water is produced after D.RO concentration can be with reuse, and producing water compared to ED concentration technology, often salt content is also higher, can not directly return With needing further desalination could reuse.Therefore high pressure RO concentration technology is used, device integrated artistic is more succinct.
It is the detail parameters of the present embodiment processing step referring to following table.
From RO concentrated water and produce water can be seen that the utility model can resource recycling power plant desulfurization wastewater zero-emission Processing unit can effectively remove COD, SS and Mg in power plant desulfurization wastewater2+、SiO2Equal divalent ions, a large amount of alkali of output and Acid realizes resource recycling and wastewater zero discharge.
The above is only the preferred embodiment of the present invention, not to the limitation of this case design, all setting according to this case The crucial equivalent variations done of meter, each falls within the protection scope of this case.

Claims (3)

1. can resource recycling power plant desulfurization wastewater zero discharge treatment device, it is characterised in that:Including three headers, clarification Pond, reaction tank, concentration water tank, sludge concentration tank, plate and frame filter press, tubular type UF membrane module, nanofiltration membrane component, RO membrane module and double Pole membrane electrodialysis system;Wherein three headers include that sequentially connected neutralization case, reaction chamber and flocculation tanks, the flocculation tanks connect clarification Pond, clarifying basin connect reaction tank, and reaction tank connects concentration water tank, and concentration water tank sludge outlet connects sludge concentration tank, and sludge concentration tank goes out Mouth connects plate and frame filter press, and concentration water tank produces water by elevator pump take-over type UF membrane module, and tubular type UF membrane module produces water and receives filter membrane Component, tubular type UF membrane module concentrated water connect concentration water tank, and nanofiltration membrane component produces water and connects RO membrane module, and nanofiltration membrane component concentrated water is reversed to answer Pond, RO membrane module produce water and connect outer comb, and RO membrane module concentrated water connects bipolar membrane electrodialysis system.
2. as described in claim 1 can resource recycling power plant desulfurization wastewater zero discharge treatment device, it is characterised in that: The nanofiltration membrane component is rolled structure.
3. as described in claim 1 can resource recycling power plant desulfurization wastewater zero discharge treatment device, it is characterised in that: The RO membrane module uses high voltage bearing disc tube reverse osmosis (dt-ro) membrane module DTRO, MTRO or STRO.
CN201820377515.7U 2018-03-20 2018-03-20 Can resource recycling power plant desulfurization wastewater zero discharge treatment device Active CN208120896U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108975598A (en) * 2018-06-21 2018-12-11 光大环保技术研究院(深圳)有限公司 A kind of zero-emission old-age group Landfill Leachate processing unit
CN110436669A (en) * 2019-08-22 2019-11-12 新疆天富能源股份有限公司 A kind of processing method of thermoelectricity factory production waste water

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108975598A (en) * 2018-06-21 2018-12-11 光大环保技术研究院(深圳)有限公司 A kind of zero-emission old-age group Landfill Leachate processing unit
CN110436669A (en) * 2019-08-22 2019-11-12 新疆天富能源股份有限公司 A kind of processing method of thermoelectricity factory production waste water

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Inventor after: Jiang Linyu

Inventor after: Wang Shudong

Inventor after: Fang Yimin

Inventor before: Jiang Linyu

Inventor before: Wang Shudong

Inventor before: Fang Yiming