CN111661886A - MVR evaporation salt separation system - Google Patents
MVR evaporation salt separation system Download PDFInfo
- Publication number
- CN111661886A CN111661886A CN201910173774.7A CN201910173774A CN111661886A CN 111661886 A CN111661886 A CN 111661886A CN 201910173774 A CN201910173774 A CN 201910173774A CN 111661886 A CN111661886 A CN 111661886A
- Authority
- CN
- China
- Prior art keywords
- denitration
- desalination
- desalting
- separator
- solid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Abstract
The invention discloses an MVR evaporation salt separation system which is divided into two working sections, namely a denitration working section and a desalination working section. The denitration workshop section includes buffer tank, denitration pre-heater, denitration evaporimeter, denitration separator, condensate water pitcher, vapor compressor, denitration stiff ware, denitration solid-liquid separation equipment. The desalting section comprises a desalting preheater, a desalting evaporator, a desalting separator, a condensate water tank, a desalting thickener, a desalting solid-liquid separation device, a vacuum device and a plurality of chemical process pumps. The equipment devices are all connected through pipelines. According to the system, the mixed salt-nitrate solution is evaporated and concentrated to a specific concentration at a high temperature according to the solubility difference of sodium sulfate and sodium chloride, and sodium sulfate crystals are separated out of the solution, so that sodium sulfate is removed from the mixed solution, and the sodium sulfate is separated from the mixed salt solution, thereby achieving the purpose of reducing secondary pollution caused by solid waste in wastewater treatment.
Description
Technical Field
The invention relates to the field of industrial wastewater treatment, in particular to an MVR evaporation salt separation system which is suitable for treating mixed wastewater which is high in concentration, contains sodium chloride and sodium sulfate components and is high in sodium sulfate content in industrial wastewater.
Background
With the development of industry, the environmental problems are increasingly serious, in recent years, with the proposal of 'zero discharge of industrial wastewater', a zero discharge system is popularized, and wastewater treated by the zero discharge system can reach the recycling standard, so that 'zero discharge of industrial wastewater' is realized. But in fact, the wastewater treatment does not classify the wastewater with different water quality, and the zero discharge brings secondary pollution on solids although the zero-sewage discharge is realized. Specifically, the most critical technology for realizing zero emission is evaporation, but no matter evaporation ponds or evaporation crystallization, the wastewater is evaporated to dryness, the remaining salt is extremely difficult to dispose, the salt cannot be treated by an incineration method, the landfill treatment risk is high, and new pollution is formed once the salt is dissolved when the salt meets water. Therefore, the optimal idea for treating the salt-containing wastewater is resource utilization, namely mass-separation crystallization.
The main components of the salts in the industrial wastewater are sodium chloride and sodium sulfate, and the sum of the two components accounts for 95-99% of all the salts in the industrial wastewater, so that the separation of the sodium chloride and the sodium sulfate is the key to realize the resource utilization of the salts in the wastewater. The common salt and nitrate separation process has the following modes:
1) evaporating at high temperature to obtain sodium sulfate, and evaporating at low temperature to obtain sodium chloride; or evaporating at high temperature to obtain sodium chloride, and evaporating at low temperature to obtain anhydrous sodium sulfate.
2) And in the freezing denitration method, crystals are precipitated from the sodium sulfate at low temperature to obtain the high-purity sodium sulfate. The mother liquor was evaporated to give sodium chloride solid.
3) The nanofiltration membrane method utilizes the high rejection rate of the nanofiltration membrane on sulfate ions to separate the mixed solution by the nanofiltration membrane to obtain the trapped liquid with high sodium sulfate concentration and the permeate liquid with high sodium chloride purity.
The method can achieve the purpose of salt and nitrate separation, but has a plurality of very obvious characteristics in the field of wastewater treatment. 1. The energy consumption is high; 2. the investment cost is huge; 3. there are cases where the final mother liquor cannot be separated further. Therefore, these separation methods are not fully suitable for the operation and working conditions of sewage treatment.
Disclosure of Invention
Aiming at the problems and the defects, the invention discloses an MVR evaporation salt separation system which is suitable for the field of sewage treatment and has the characteristics of strong applicability, low energy consumption, capability of separating nitrate and reducing secondary pollution.
The technical principle of the invention is as follows: based on MVR evaporation crystallization technology, according to the difference of solubility curves of sodium sulfate and sodium chloride, in the separation of salt and nitrate by a thermal method, the sodium sulfate is crystallized out firstly, and the purity of the sodium sulfate is easy to guarantee at the moment. The separated mother liquor is sent into an evaporator for continuous evaporation and crystallization, and the miscellaneous salt in the waste water is separated out.
The method is characterized in that: the MVR evaporation technology is adopted to evaporate the salt and nitrate mixed liquid, so that the aim of separating salt is fulfilled. The system is divided into two working sections, namely a denitration working section and a desalination working section. The denitration workshop section includes buffer tank, denitration pre-heater, denitration evaporimeter, denitration separator, condensate water pitcher, vapor compressor, denitration stiff ware, denitration solid-liquid separation equipment. The desalting section comprises a desalting preheater, a desalting evaporator, a desalting separator, a condensate water tank, a desalting thickener, a desalting solid-liquid separation device, a vacuum device and a plurality of chemical process pumps. The buffer tank is connected to the denitration preheater, the denitration preheater is connected to the denitration evaporator, the denitration evaporator with the denitration separator is connected, the steam outlet of denitration separator is connected to the steam compressor entry, the denitration separator with the denitration thickener, the material export of denitration thickener with denitration solid-liquid separation equipment connects, denitration solid-liquid separation equipment is connected to the mother liquor pond. The mother liquid pool is connected to the desalination preheater, the desalination preheater is connected to the desalination evaporator, the desalination evaporator is connected with the desalination separator, the steam outlet of the desalination separator is connected to the steam compressor inlet, the desalination separator with the desalination thickener, the material outlet of the desalination thickener is connected with the desalination solid-liquid separation device, the desalination solid-liquid separation device is connected to the mother liquid pool, and the mother liquid pool is connected to the desalination separator.
As a further improvement of the invention: also included is a vacuum device connected to the condensate tank.
As a further improvement of the invention: the denitration and desalination evaporator is a plate heat exchanger or a tube type heat exchanger.
As a further improvement of the invention: the system adopts a forced circulation mode to evaporate and desalt.
As a further improvement of the invention: the water vapor compressor is a Roots water vapor compressor or a centrifugal water vapor compressor.
As a further improvement of the invention: the solid-liquid separation device is a centrifugal machine, a filter press or vacuum filtration equipment.
As a further improvement of the invention: the water vapor compressor is connected to the denitration and desalination evaporator and provides a heat source for evaporation.
The MVR evaporation salt separation system disclosed by the invention aims at the waste liquid with high sodium sulfate and sodium chloride content in industrial wastewater treatment, and has the characteristics of low energy consumption, high treatment capacity, capability of separating nitrate and reducing secondary pollution. Not only can reduce the generation of solid wastes, but also achieves the purpose of resource utilization.
Drawings
In order to facilitate a better understanding and practice of the invention, the following description is given in conjunction with the detailed description of the invention and the process flow diagrams.
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
As shown in the process flow diagram of fig. 1, the invention discloses an MVR evaporation salt separation system. The method is characterized in that: the system is divided into two working sections, namely a denitration working section and a desalination working section. The denitration workshop section includes buffer tank 1, denitration preheater 2, denitration evaporimeter 3, denitration separator 4, vapor compressor 5, condensate water jar 6, denitration stiff ware 8, denitration solid-liquid separation equipment 9. The desalting section comprises a desalting preheater 11, a desalting evaporator 12, a desalting separator 13, a condensed water tank 14, a desalting thickener 15, a desalting solid-liquid separation device 16, vacuum devices 7 and 18 and a plurality of chemical process pumps.
A technical scheme for treating wastewater by adopting the system is shown in figure 1, and comprises the following steps: after entering a buffer tank 1, the salt and nitrate wastewater A is preheated to 60-90 ℃ by a denitration preheater 2, then enters a denitration evaporator 3 to be heated to a bubble point, and is subjected to gas-liquid separation in a denitration separator 4, wherein the separated gas phase is steam at the temperature of 90-100 ℃, and the liquid phase is a concentrated liquid of solid-liquid mixture at the temperature of 90-120 ℃. The water vapor is sent to a compressor 5, the temperature is raised to 100-120 ℃ after compression, the water vapor is used as a heat source of the denitration evaporator 3, the water vapor is cooled and then changed into distilled water B, the distilled water B is discharged to a condensation water tank 6, and the distilled water B is discharged out of the system after passing through a denitration preheater 2. The concentrated solution enters a denitration thickener 8 to be stirred and then is discharged to a denitration solid-liquid separation device 9 to be subjected to solid-liquid separation, the separated solid is sodium sulfate crystal C, and the liquid is mixed salt liquid. Discharging the mixed salt solution to a mother liquor pool 10, and reducing the temperature to 40-60 ℃.
Entering a desalting section, preheating to 60-90 ℃ by a desalting preheater 11, entering a desalting evaporator 12, heating to a bubble point, and carrying out gas-liquid separation in a desalting separator 13, wherein the separated gas phase is steam and the temperature is 90-100 ℃, and the liquid phase is a solid-liquid mixed concentrated solution and the temperature is 90-120 ℃. The water vapor is sent to a compressor 5, the temperature is raised to 120 ℃ after being compressed, then the water vapor is used as a heat source of a desalination evaporator 12, the water vapor is cooled and then becomes distilled water B, the distilled water B is discharged to a condensation water tank 14, and the distilled water B is discharged out of the system after passing through a desalination preheater 11; the concentrated solution enters a desalting thickener 15 to be stirred and then is discharged to a desalting solid-liquid separation device 16 to be subjected to solid-liquid separation, the separated solid is a mixed salt solid D, and the liquid is a mixed salt mixed solution. The mixed salt mixed liquid is discharged to a mother liquid pool 10, then returns to a desalination separator 13, and enters a system machine type for evaporation.
All the equipment devices are connected through pipelines.
The MVR evaporation salt separation system is suitable for treating mixed wastewater which is high in concentration, contains sodium chloride and sodium sulfate components and is high in sodium sulfate content in industrial wastewater. Aiming at the waste liquid with high sodium sulfate and sodium chloride content in the industrial wastewater treatment, the method has the characteristics of low energy consumption, high treatment capacity, capability of separating nitrate and reducing secondary pollution. Not only can reduce the generation of solid wastes, but also achieves the purpose of resource utilization
The above description is directed to embodiments of the present invention, but is not limited to the above embodiments. If any equivalent changes or modifications are made to the present disclosure without departing from the scope of the present invention, these changes and modifications should be considered as the protection scope of the present invention if they fall within the claims and the equivalent technical scope of the present invention.
Claims (7)
1. A MVR evaporation salt separation system is characterized in that: the MVR is adopted to evaporate the salt and nitrate mixed liquid, so that the aim of separating salt is fulfilled. The system is divided into two working sections, namely a denitration working section and a desalination working section. The denitration workshop section includes buffer tank, denitration pre-heater, denitration evaporimeter, denitration separator, condensate water pitcher, vapor compressor, denitration stiff ware, denitration solid-liquid separation equipment. The desalting section comprises a desalting preheater, a desalting evaporator, a desalting separator, a condensate water tank, a desalting thickener, a desalting solid-liquid separation device, a vacuum device and a plurality of chemical process pumps. The buffer tank is connected to the denitration preheater, the denitration preheater is connected to the denitration evaporator, the denitration evaporator with the denitration separator is connected, the steam outlet of denitration separator is connected to the steam compressor entry, the denitration separator with the denitration thickener, the material export of denitration thickener with denitration solid-liquid separation equipment connects, denitration solid-liquid separation equipment is connected to the mother liquor pond. The mother liquid pool is connected to the desalination preheater, the desalination preheater is connected to the desalination evaporator, the desalination evaporator is connected with the desalination separator, the steam outlet of the desalination separator is connected to the steam compressor inlet, the desalination separator with the desalination thickener, the material outlet of the desalination thickener is connected with the desalination solid-liquid separation device, the desalination solid-liquid separation device is connected to the mother liquid pool, and the mother liquid pool is connected to the desalination separator.
2. The MVR evaporative salt separation system of claim 1, wherein: also included is a vacuum device connected to the condensate tank.
3. The MVR evaporative salt separation system of claim 1, wherein: the denitration and desalination evaporator is a plate heat exchanger or a tube type heat exchanger.
4. The MVR evaporative salt separation system of claim 1, wherein: the system adopts a forced circulation mode to evaporate and desalt.
5. The MVR evaporative salt separation system of claim 1, wherein: the water vapor compressor is a Roots water vapor compressor or a centrifugal water vapor compressor.
6. The MVR evaporative salt separation system of claim 1, wherein: the solid-liquid separation device is a centrifugal machine, a filter press or vacuum filtration equipment.
7. The MVR evaporative salt separation system of claim 1, wherein: the water vapor compressor is connected to the denitration and desalination evaporator and provides a heat source for evaporation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910173774.7A CN111661886A (en) | 2019-03-07 | 2019-03-07 | MVR evaporation salt separation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910173774.7A CN111661886A (en) | 2019-03-07 | 2019-03-07 | MVR evaporation salt separation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111661886A true CN111661886A (en) | 2020-09-15 |
Family
ID=72382359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910173774.7A Pending CN111661886A (en) | 2019-03-07 | 2019-03-07 | MVR evaporation salt separation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111661886A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480074A (en) * | 2021-07-29 | 2021-10-08 | 阳谷祥光铜业有限公司 | Advanced wastewater treatment system and process |
| CN114409157A (en) * | 2021-11-12 | 2022-04-29 | 重庆市映天辉氯碱化工有限公司 | Resource method for preparing chlor-alkali by electrolyzing waste brine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120095654A (en) * | 2011-02-21 | 2012-08-29 | 곽승룡 | Mvr(mechanical vapor re-compressor system) using evaporator for waste water |
| CN105016555A (en) * | 2015-07-18 | 2015-11-04 | 北京建筑材料科学研究总院有限公司 | Garbage fly ash water washing liquid evaporation desalination system and method |
| CN105523676A (en) * | 2015-12-23 | 2016-04-27 | 倍杰特国际环境技术股份有限公司 | High-salt wastewater zero-discharge evaporation crystallization salt substance-division method |
| CN107162297A (en) * | 2016-03-08 | 2017-09-15 | 广州市心德实业有限公司 | One kind one imitates four body MVR mixed salts waste water separators and separation method |
| CN107364877A (en) * | 2017-08-09 | 2017-11-21 | 深圳市瑞升华科技股份有限公司 | A kind of solventing-out Processes and apparatus of zero discharge of industrial waste water |
-
2019
- 2019-03-07 CN CN201910173774.7A patent/CN111661886A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120095654A (en) * | 2011-02-21 | 2012-08-29 | 곽승룡 | Mvr(mechanical vapor re-compressor system) using evaporator for waste water |
| CN105016555A (en) * | 2015-07-18 | 2015-11-04 | 北京建筑材料科学研究总院有限公司 | Garbage fly ash water washing liquid evaporation desalination system and method |
| CN105523676A (en) * | 2015-12-23 | 2016-04-27 | 倍杰特国际环境技术股份有限公司 | High-salt wastewater zero-discharge evaporation crystallization salt substance-division method |
| CN108275816A (en) * | 2015-12-23 | 2018-07-13 | 倍杰特国际环境技术股份有限公司 | A kind of high-salinity wastewater zero-emission crystalline salt by evaporation sub-prime device and method |
| CN107162297A (en) * | 2016-03-08 | 2017-09-15 | 广州市心德实业有限公司 | One kind one imitates four body MVR mixed salts waste water separators and separation method |
| CN107364877A (en) * | 2017-08-09 | 2017-11-21 | 深圳市瑞升华科技股份有限公司 | A kind of solventing-out Processes and apparatus of zero discharge of industrial waste water |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480074A (en) * | 2021-07-29 | 2021-10-08 | 阳谷祥光铜业有限公司 | Advanced wastewater treatment system and process |
| CN114409157A (en) * | 2021-11-12 | 2022-04-29 | 重庆市映天辉氯碱化工有限公司 | Resource method for preparing chlor-alkali by electrolyzing waste brine |
| CN114409157B (en) * | 2021-11-12 | 2023-10-13 | 重庆市映天辉氯碱化工有限公司 | Recycling method for preparing chlor-alkali by waste salt water electrolysis |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106830465B (en) | Salt separation and purification recovery method of salt-containing wastewater | |
| CN102849887B (en) | Seawater desalting method | |
| CN108275815B (en) | High-salinity wastewater zero-discharge evaporation crystallization salt quality-grading system and method | |
| CN113636702A (en) | Recycling and zero-discharge process for salt-containing organic wastewater | |
| WO2006094437A1 (en) | A method and an multi-effect evaporation for waste water of alkylene oxides | |
| CN106630332A (en) | Garbage leachate reverse-osmosis concentrate treatment method | |
| CN102030441A (en) | Method for treating wastewater in production of sebacic acid | |
| CN104926011B (en) | The evaporative crystallization zero-discharge treatment system and processing method of a kind of high-COD waste water | |
| CN105084630A (en) | Oil refining catalyst wastewater zero-discharging treatment method | |
| CN101318716A (en) | Film evaporating concentration liquid processing system and processing method | |
| CN111661886A (en) | MVR evaporation salt separation system | |
| CN108275823A (en) | A kind of compound Zero discharging system of dense salt waste water and technique | |
| CN204310904U (en) | A kind of system reclaiming salt from Waste Water Treatment | |
| WO2024041327A1 (en) | Energy-saving treatment system and process for salt-containing and heavy metal-containing ammonia-nitrogen wastewater | |
| CN105481160B (en) | Method and device for preparing industrial salt by strong brine with zero discharge | |
| CN112408569A (en) | Continuous treatment method of high-salinity wastewater containing sodium chloride | |
| CN204939142U (en) | A kind for the treatment of facility of desulfurization wastewater of flue gas desulphurization system discharge | |
| CN101503257B (en) | Method and apparatus for recovering and treating ammonium nitrate condensate liquid wastewater | |
| CN208440312U (en) | A kind of processing system of desulfurization wastewater | |
| CN105152405A (en) | Method and device for treating desulfurization wastewater discharged by flue gas desulfurization system | |
| CN106430771B (en) | salt separation system and salt separation method | |
| CN107540139B (en) | Recycling treatment system and method for cold rolling wastewater ion exchange strong brine | |
| CN216273564U (en) | Ammonium nitrate wastewater treatment system | |
| CN205473142U (en) | Device of industry salt is prepared in strong brine zero release | |
| CN213294703U (en) | Fly ash desalination system containing potassium chloride salt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |