CN205347089U - Desulfurization wastewater treatment system - Google Patents
Desulfurization wastewater treatment system Download PDFInfo
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- CN205347089U CN205347089U CN201620056084.5U CN201620056084U CN205347089U CN 205347089 U CN205347089 U CN 205347089U CN 201620056084 U CN201620056084 U CN 201620056084U CN 205347089 U CN205347089 U CN 205347089U
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- desulfurization wastewater
- nanofiltration
- wastewater treatment
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- evaporation
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Abstract
The utility model relates to a desulfurization wastewater treatment system, desulfurization wastewater treatment system includes pretreatment systems, membrane processing system and evaporation crystal system, pretreatment systems, membrane processing system and evaporation crystal system are arranged in proper order, pretreatment systems is used for the useless pretreatment of water of desulfurization, membrane processing system is used for the desulfurization advanced waste treatment after the preliminary treatment, the evaporation crystal system is used for the evaporation crystallization of membrane processing system concentrate and obtains crystallization salt. The utility model provides a desulfurization wastewater treatment system strains the desulfurization waste water after processing system handles the preliminary treatment through receiving, with the divalence ion separation in the desulfurization waste water to realize the branch matter retrieval and utilization of desulfurization waste water, improved the reclamation rate of water, wash to receive through reverse osmosis system's product water and strain processing system to reduce the chemical drug agent of CS&S of soft clarification system respectively and received the dosage of throwing of straining among processing system antisludging agent.
Description
Technical field
This utility model belongs to Industrial Waste Water Treatments field, especially relates to a kind of desulfurization wastewater treatment system.
Background technology
Coal-burning power plant occupies an leading position in supply of electric power enterprise of China, for avoiding atmospheric pollution, flue gas need to be carried out desulfurization process.At present, the method that domestic and international coal fired power plant flue gas desulfurization engineering adopts is based on limestone-gypsum method, and system can produce a certain amount of desulfurization wastewater.Desulfurization wastewater contains substantial amounts of float, sulfate, chloride, hardness, and salinity is higher, and containing a certain amount of heavy metal ion, environmental hazard is huge, it is necessary to strictly to process.Traditional " three headers " technique is neutralized by desulfurization wastewater, after flocculation and precipitation process, remove the materials such as the float in waste water and heavy metal, it is impossible to ensure treatment effect, and it is higher to process water content salt, it is impossible to reuse other system.Along with improving constantly of environmental requirement, advanced treatment and reclamation desulfurization wastewater, it is achieved wastewater zero discharge is a kind of trend that desulfurization wastewater processes.
Evaporation technique is the effective technology realizing desulfurization wastewater zero-emission, but the direct evaporation water yield is relatively big, and consumption quantity of steam or power consumption are very big, and investment and operating cost are high；Adopting flue evaporation technique, increase smoke moisture, affect dust pelletizing system, corrosion and scaling risk increases, and cannot recycle-water resource.Adopt membrane separating method, such as nanofiltration, reverse osmosis, exist concentration should not too high, inefficient, the shortcoming such as operating pressure is high, fouling membrane is serious, and concentrated solution volume is bigger.Simple adopt electrodialysis not only to invest greatly, application fee height, and there is recycle-water and cannot meet up-to-date discharging standards.Just permeating and belonging to new technique in desulfurization wastewater application, but complex process, film and draw that liquid selectivity is few, technology maturity is relatively low and energy consumption is higher.
Utilize dual-membrane process associating evaporation technique can realize wastewater zero discharge.Patent 201310555063.9 adopts sea water film and the combination of high pressure resistant film, flyash reactive crystallization by the strong brine of high-pressure membrane salinity out with ash field, the film operating pressure of this technique is very high, pre-processing requirements is high, medicament and energy consumption are relatively big, and strong brine waste, and reusing rate is relatively low.A kind of desulfurization wastewater technique of zero discharge is announced in patent application 201510275955.2, nanofiltration and reverse osmosis isolation is used after adopting two-stage softening, ion exchange, freezing and crystallizing and evaporation technology is utilized to realize a point salt, but the problem that this technique equally exists operating pressure height, the chemical feeding quantity bigger energy consumption of water volume big, dense is higher and technique is complex.Patent application 201410240730.9 discloses a kind of desulfurization wastewater and recycles and Zero discharging system, waste water is through multistage filtering pretreatment, adopt two-stage nanofiltration separation, the dense water of nanofiltration returns desulfurizing tower, fresh water softening after through the unit such as reverse osmosis, electrodialysis concentrate after evaporative crystallization, but this technique nanofiltration stage fouling risk is high, antisludging agent chemical feeding quantity is big, operating pressure is higher and dense water water quality is difficult to ensure that, and the follow-up sofening treatment that needs also exist for, technique line length and complexity.
How to utilize different film processing system and processing method efficient combination, realize desulfurization wastewater separate-recycling, reduction adds pharmaceutical quantities, reduce operating pressure, increase wastewater recycle rate, reduce concentrated solution volume, reduce operating cost, is the key of desulfurization wastewater advanced treatment and reclamation and zero-emission.
Summary of the invention
The purpose of this utility model is in that, for the above deficiency existed, it is provided that a kind of desulfurization wastewater treatment system.
For this, this utility model provides following technical scheme:
A kind of desulfurization wastewater treatment system, described desulfurization wastewater treatment system is for processing the desulfurization wastewater from desulphurization system, described desulfurization wastewater treatment system includes pretreatment system, film processing system and evaporation and crystallization system, and described pretreatment system, film processing system and evaporation and crystallization system are sequentially arranged；Described pretreatment system for carrying out pretreatment to desulfurization wastewater, and described film processing system for carrying out advanced treating to pretreated desulfurization wastewater, and described evaporation and crystallization system is for being evaporated crystallization to film processing system concentrated solution and obtaining crystal salt；
Further, described film processing system includes nanofiltration and processes system, seawater reverse osmosis permeable system, electric drive film separation system and bitter counter-infiltration system, described nanofiltration processes system, seawater reverse osmosis permeable system, electric drive film separation system and bitter counter-infiltration system are sequentially arranged, described nanofiltration processes system and processes the waste water of preprocessed system institute pretreatment for nanofiltration, described nanofiltration processes the product water entrance seawater reverse osmosis permeable system of system and carries out reverse-osmosis treated, it is divided into two strands after the concentrated solution of described seawater reverse osmosis permeable system and the concentrated solution mixing of bitter counter-infiltration system, one enters the enriched chamber of electric drive film separation system, another strand enters the diluting compartment of electric drive film separation system, the desalination solution of described electric drive film separation system enters bitter counter-infiltration system and carries out reverse-osmosis treated, the concentrated solution of described electric drive film separation system enters evaporation and crystallization system and is evaporated crystallization.
Further, described nanofiltration processes system is one-level nanofiltration device or the combination of multistage nanofiltration device.
Further, described nanofiltration process system does not add antisludging agent or dosage lower than conventional dosage.
Further, in the product water of described nanofiltration process system, the content of sulfate radical is less than 1.0%, the content of chloride ion in the close water inlet of the content of chloride ion.
Further, in the dense water of described nanofiltration process system, the content of chloride ion is less than 5000ppm, and described nanofiltration processes the NF concentrated water reuse of system to the desulfurizing tower of desulphurization system.
Further, the equal reuse of water to the nanofiltration of producing producing water and described bitter counter-infiltration system of described seawater reverse osmosis permeable system processes the counter-infiltration system product water inlet of system.
Further, described nanofiltration process the counter-infiltration system of system produce water inlet and the nanofiltration corresponding to pretreatment system to process the entrance of system be different entrance.
Further, the ratio producing the waste water total amount that water inventory processes system with described entrance nanofiltration of described seawater reverse osmosis permeable system and bitter counter-infiltration system is 1:1-1:10.
Further, described nanofiltration processes the NF membrane of system is sulfate ion nanofiltration separation membrane.
Further, described electric drive film separation system adopts heterogeneous membrane or homogeneous membrane or half homogeneous membrane.
Further, the total dissolved solid content in the concentrated solution of described electric drive film separation system is more than 10%.
Further, described pretreatment system includes softening clarification system and filtration system, described softening clarification system and filtration system are sequentially arranged, described softening clarification system is for carrying out sofening treatment to the desulfurization wastewater from desulphurization system, and described filtration system is for being filtered separating to the waste water after softening clarification system sofening treatment.
Further, described filtration system is one or more the combination in mechanical filtration systems, tubular type microfiltration systems and ultrafiltration system.
Further, the chemical feeding quantity in described softening clarification system lower than tradition melded system or does not add softening medicament.
Further, the medicament added in described softening clarification system is one or more the combination in sodium hydroxide, soda, flocculant.
Further, described evaporation and crystallization system is MVR evaporation and crystallization system or multi-effect evaporation system or Membrane Materials system, and the condensed water of described evaporation and crystallization system carries out reuse, and the crystal salt of described evaporation and crystallization system can be used for Nacl.
This utility model provides a kind of desulfurization wastewater treatment system, and compared with prior art, desulfurization wastewater treatment system provided by the utility model has the advantage that
(1) desulfurization wastewater treatment system provided by the utility model has coupled materializing strategy and membrane technology, improves the stability that system is run；
(2) desulfurization wastewater treatment system provided by the utility model adopts nanofiltration process system to carry out nanofiltration and processes pretreated desulfurization wastewater, a divalent ion in desulfurization wastewater is easily separated, it is achieved thereby that the separate-recycling of desulfurization wastewater, improve the reclamation rate of water；
(3) desulfurization wastewater treatment system provided by the utility model is washed nanofiltration by the product water producing water and bitter counter-infiltration system of seawater reverse osmosis permeable system and is processed system, reduce the amount processing the softening medicament requiring and adding in pretreatment system of pretreatment system, also reduce nanofiltration simultaneously and process the operation pressure of system, further reduce the amount of the antisludging agent added in nanofiltration process system；
(4) desulfurization wastewater treatment system provided by the utility model adopts the method that reverse osmosis and electric drive film combine, and overcomes nanofiltration and processes the water that produces of system and be directly entered the uneconomical problem that electric drive film separation system carries out concentrating and the relatively low problem of the cycles of concentration carrying out concentrating only with counter-infiltration system and not adopting electric drive film separation system to carry out concentrating and produce；
(5) in desulfurization wastewater treatment system provided by the utility model, nanofiltration processes the NF concentrated water reuse of system to the desulfurizing tower of desulphurization system, the recycling condensing water of evaporation and crystallization system, the crystal salt that evaporation and crystallization system produces can as Nacl, it is achieved thereby that the zero-emission effect of waste water, there is good social value and the value of environmental protection.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of desulfurization wastewater treatment system provided by the utility model；
In figure: 101-softens clarification system；102-filtration system；201-nanofiltration processes system；202-seawater reverse osmosis permeable system；203-electric drive film separation system；204-bitter counter-infiltration system；301-MVR evaporation and crystallization system.
Detailed description of the invention
With reference to accompanying drawing be embodied as example this utility model is described in further detail.
A kind of desulfurization wastewater treatment system, described desulfurization wastewater treatment system is for processing the desulfurization wastewater from desulphurization system, described desulfurization wastewater treatment system includes pretreatment system, film processing system and evaporation and crystallization system, and described pretreatment system, film processing system and evaporation and crystallization system are sequentially arranged；Described pretreatment system for carrying out pretreatment to desulfurization wastewater, and described film processing system for carrying out advanced treating to pretreated desulfurization wastewater, and described evaporation and crystallization system is for being evaporated crystallization to film processing system concentrated solution and obtaining crystal salt；
Described film processing system includes nanofiltration and processes system 201, seawater reverse osmosis permeable system 202, electric drive film separation system 203 and bitter counter-infiltration system 204, described nanofiltration processes system 201, seawater reverse osmosis permeable system 202, electric drive film separation system 203 and bitter counter-infiltration system 204 are sequentially arranged, described nanofiltration processes system 201 and processes the waste water of preprocessed system institute pretreatment for nanofiltration, described nanofiltration processes the product water entrance seawater reverse osmosis permeable system 202 of system 201 and carries out reverse-osmosis treated, it is divided into two strands after the concentrated solution of described seawater reverse osmosis permeable system 202 and the concentrated solution mixing of bitter counter-infiltration system 204, one enters the enriched chamber of electric drive film separation system 203, another strand enters the diluting compartment of electric drive film separation system 203, the desalination solution of described electric drive film separation system 203 enters bitter counter-infiltration system 204 and carries out reverse-osmosis treated, the concentrated solution of described electric drive film separation system 203 enters evaporation and crystallization system and is evaporated crystallization.
Described nanofiltration processes the combination that system 201 is one-level nanofiltration device or multistage nanofiltration device.
Described nanofiltration processes and does not add antisludging agent or dosage in system 201 lower than conventional dosage.
In the product water of described nanofiltration process system 201, the content of sulfate radical is less than 1.0%, the content of chloride ion in the close water inlet of the content of chloride ion.
In the dense water of described nanofiltration process system 201, the content of chloride ion is less than 5000ppm, and described nanofiltration processes the NF concentrated water reuse of system 201 to the desulfurizing tower of desulphurization system.
The equal reuse of water to the nanofiltration of producing producing water and described bitter counter-infiltration system 204 of described seawater reverse osmosis permeable system 202 processes the counter-infiltration system product water inlet of system 201.
Described nanofiltration process the counter-infiltration system of system 201 produce water inlet and the nanofiltration corresponding to pretreatment system to process the entrance of system be different entrance.
The ratio producing the waste water total amount that water inventory processes system 201 with described entrance nanofiltration of described seawater reverse osmosis permeable system 202 and bitter counter-infiltration system 204 is 1:1-1:10.
It is sulfate ion nanofiltration separation membrane that described nanofiltration processes the NF membrane of system 201.
Described electric drive film separation system 203 adopts heterogeneous membrane or homogeneous membrane or half homogeneous membrane.
Total dissolved solid content in the concentrated solution of described electric drive film separation system 203 is more than 10%.
Described pretreatment system includes softening clarification system 101 and filtration system 102, described softening clarification system 101 and filtration system 102 are sequentially arranged, described softening clarification system 101 for carrying out sofening treatment to the desulfurization wastewater from desulphurization system, and described filtration system 102 is for being filtered separating to the waste water after softening clarification system 101 sofening treatment.
Described filtration system 102 is one or more the combination in mechanical filtration systems, tubular type microfiltration systems and ultrafiltration system.
The medicament added in described softening clarification system 101 is one or more the combination in sodium hydroxide, soda, flocculant.
Described evaporation and crystallization system is MVR evaporation and crystallization system 301, and the condensed water of described evaporation and crystallization system carries out reuse, and the crystal salt of described evaporation and crystallization system can be used for Nacl.
Specifically, following technique can be adopted:
Certain Desulphurization for Coal-fired Power Plant waste water salinity 2.7%, chlorine ion concentration is 13500ppm, and sulfate concentration is 2040ppm, and Na ion concentration is 1040ppm, and magnesium ion concentration is 1670ppm, and calcium ion concentration is 4500ppm.
Desulfurization wastewater does not soften, after clarified filtration, turbidity is less than 1NTU, enter nanofiltration process system and carry out nanofiltration process, not adding antisludging agent in nanofiltration process system, be 1:3 for washing the ratio producing the desulfurization wastewater total amount that water inventory processes system with entrance nanofiltration of the counter-infiltration system that nanofiltration processes system, nanofiltration processes the operating pressure 0.6-0.7Mpa of system, in the dense water of nanofiltration process system, chloride ion content is less than 3000ppm, and reuse is to the desulfurizing tower of desulphurization system；In the product water of nanofiltration process system, sulfate radical content is less than 20ppm, enters seawater reverse osmosis permeable system and is easily separated concentration, and the product water salinity of seawater reverse osmosis permeable system, less than 300ppm, is back to nanofiltration and processes system for nanofiltration process system is washed；The salinity of the concentrated solution of seawater reverse osmosis permeable system be 3-5%wt and bitter counter-infiltration system concentrated solution mixing after be divided into two strands, one enters the enriched chamber of electric drive film separation system, another strand enters the diluting compartment of electric drive film separation system, the desalination solution of electric drive film separation system enters bitter counter-infiltration system and carries out reverse-osmosis treated, the concentrated solution of bitter counter-infiltration system and the concentrated solution mixing of seawater reverse osmosis permeable system, the product water of bitter counter-infiltration system is back to nanofiltration and processes system for nanofiltration process system is washed；The final concentrated solution salt content produced in electric drive film separation system is 15%wt, and this concentrated solution is delivered to MVR evaporation and crystallization system and is evaporated crystallization.
Desulphurization for Coal-fired Power Plant waste water is processed according to the technical solution of the utility model, owing to nanofiltration processes the technology that system adopts the product water of counter-infiltration system to wash, so that the chemical feeding quantity in softening clarification system lower than tradition melded system or does not add softening medicament, and without adding antisludging agent in nanofiltration process system, and it is directly used in the chloride ion separated in desulfurization wastewater, reduce medicament and make consumption.Nanofiltration is processed the product water of system and is concentrated by reverse osmosis and electrodialysis process, significantly reduces the volume of concentrated solution, finally by evaporative crystallization technique, it is achieved thereby that the zero-emission of desulfurization wastewater.
Above-mentioned detailed description of the invention is used for illustrating this utility model; it is only preferred embodiment of the present utility model; rather than this utility model is limited; in spirit of the present utility model and scope of the claims; any amendment that this utility model is made, equivalent replacement, improvement etc., both fall within protection domain of the present utility model.
Claims (10)
1. a desulfurization wastewater treatment system, it is characterized in that, described desulfurization wastewater treatment system is for processing the desulfurization wastewater from desulphurization system, described desulfurization wastewater treatment system includes pretreatment system, film processing system and evaporation and crystallization system, and described pretreatment system, film processing system and evaporation and crystallization system are sequentially arranged；Described pretreatment system for carrying out pretreatment to desulfurization wastewater, and described film processing system for carrying out advanced treating to pretreated desulfurization wastewater, and described evaporation and crystallization system is for being evaporated crystallization to film processing system concentrated solution and obtaining crystal salt.
2. desulfurization wastewater treatment system according to claim 1, it is characterized in that, described film processing system includes nanofiltration and processes system, seawater reverse osmosis permeable system, electric drive film separation system and bitter counter-infiltration system, described nanofiltration processes system, seawater reverse osmosis permeable system, electric drive film separation system and bitter counter-infiltration system are sequentially arranged, described nanofiltration processes system and processes the waste water of preprocessed system institute pretreatment for nanofiltration, described nanofiltration processes the product water entrance seawater reverse osmosis permeable system of system and carries out reverse-osmosis treated, it is divided into two strands after the concentrated solution of described seawater reverse osmosis permeable system and the concentrated solution mixing of bitter counter-infiltration system, one enters the enriched chamber of electric drive film separation system, another strand enters the diluting compartment of electric drive film separation system, the desalination solution of described electric drive film separation system enters bitter counter-infiltration system and carries out reverse-osmosis treated, the concentrated solution of described electric drive film separation system enters evaporation and crystallization system and is evaporated crystallization.
3. desulfurization wastewater treatment system according to claim 2, it is characterised in that the equal reuse of water to the nanofiltration of producing producing water and described bitter counter-infiltration system of described seawater reverse osmosis permeable system processes the counter-infiltration system product water inlet of system.
4. desulfurization wastewater treatment system according to claim 3, it is characterised in that described nanofiltration process the counter-infiltration system of system produce water inlet and the nanofiltration corresponding to pretreatment system to process the entrance of system be different entrance.
5. desulfurization wastewater treatment system according to claim 3, it is characterised in that the ratio producing the waste water total amount that water inventory processes system with described entrance nanofiltration of described seawater reverse osmosis permeable system and bitter counter-infiltration system is 1:1-1:10.
6. desulfurization wastewater treatment system according to claim 2, it is characterised in that described nanofiltration processes the NF concentrated water reuse of system to desulphurization system.
7. desulfurization wastewater treatment system according to claim 2, it is characterised in that it is sulfate ion nanofiltration separation membrane that described nanofiltration processes the NF membrane of system.
8. desulfurization wastewater treatment system according to claim 1, it is characterized in that, described pretreatment system includes softening clarification system and filtration system, described softening clarification system and filtration system are sequentially arranged, described softening clarification system is for carrying out sofening treatment to the desulfurization wastewater from desulphurization system, and described filtration system is for being filtered separating to the waste water after softening clarification system sofening treatment.
9. desulfurization wastewater treatment system according to claim 8, it is characterised in that described filtration system is one or more the combination in mechanical filtration systems, tubular type microfiltration systems and ultrafiltration system.
10. desulfurization wastewater treatment system according to claim 1, it is characterised in that described evaporation and crystallization system is MVR evaporation and crystallization system or multi-effect evaporation system or Membrane Materials system.
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| CN201620056084.5U CN205347089U (en) | 2016-01-20 | 2016-01-20 | Desulfurization wastewater treatment system |
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| CN201620056084.5U CN205347089U (en) | 2016-01-20 | 2016-01-20 | Desulfurization wastewater treatment system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105502790A (en) * | 2016-01-20 | 2016-04-20 | 杭州水处理技术研究开发中心有限公司 | Desulfurization wastewater treatment system |
| CN111039488A (en) * | 2020-01-06 | 2020-04-21 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater recycling treatment system and treatment method |
| CN112340909A (en) * | 2019-08-06 | 2021-02-09 | 中国石油化工股份有限公司 | Industrial wastewater treatment system and application thereof |
-
2016
- 2016-01-20 CN CN201620056084.5U patent/CN205347089U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105502790A (en) * | 2016-01-20 | 2016-04-20 | 杭州水处理技术研究开发中心有限公司 | Desulfurization wastewater treatment system |
| CN112340909A (en) * | 2019-08-06 | 2021-02-09 | 中国石油化工股份有限公司 | Industrial wastewater treatment system and application thereof |
| CN111039488A (en) * | 2020-01-06 | 2020-04-21 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater recycling treatment system and treatment method |
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Granted publication date: 20160629 Effective date of abandoning: 20180417 |