CN115417547A - Precursor synthesis wastewater desalination system - Google Patents
Precursor synthesis wastewater desalination system Download PDFInfo
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- CN115417547A CN115417547A CN202211062261.7A CN202211062261A CN115417547A CN 115417547 A CN115417547 A CN 115417547A CN 202211062261 A CN202211062261 A CN 202211062261A CN 115417547 A CN115417547 A CN 115417547A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 97
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 59
- 239000002243 precursor Substances 0.000 title claims abstract description 22
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 21
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 230000009615 deamination Effects 0.000 claims abstract description 33
- 238000006481 deamination reaction Methods 0.000 claims abstract description 33
- 239000013505 freshwater Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 18
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 15
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 15
- 239000013078 crystal Substances 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000002244 precipitate Substances 0.000 claims abstract description 10
- 238000001704 evaporation Methods 0.000 claims abstract description 9
- 238000011033 desalting Methods 0.000 claims abstract description 7
- 238000001223 reverse osmosis Methods 0.000 claims description 50
- 239000000523 sample Substances 0.000 claims description 30
- 239000012528 membrane Substances 0.000 claims description 23
- 238000011001 backwashing Methods 0.000 claims description 21
- 238000012544 monitoring process Methods 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- 230000033116 oxidation-reduction process Effects 0.000 claims description 5
- 238000004065 wastewater treatment Methods 0.000 claims description 5
- 239000000022 bacteriostatic agent Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 3
- 239000002455 scale inhibitor Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 2
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- 239000006227 byproduct Substances 0.000 abstract description 9
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 235000011152 sodium sulphate Nutrition 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 239000012452 mother liquor Substances 0.000 description 2
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- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000010446 mirabilite Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000003204 osmotic effect Effects 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/05—Conductivity or salinity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- 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
-
- 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
- Y02A20/131—Reverse-osmosis
Abstract
The invention discloses a precursor synthesis wastewater desalination system, which comprises: a pretreatment system, a desalination system and a mechanical vapor recompression system; the pretreatment system is used for adjusting the value of the wastewater, stripping and deaminating the wastewater, recovering the generated ammonia water, and intercepting and adjusting the value of precipitates of the deaminated wastewater; the desalting system is used for pressurizing and desalting the deaminated wastewater to generate fresh water and concentrated water; and the mechanical vapor recompression system is used for evaporating the concentrated water generated by the desalination system to obtain condensed water and crystals, storing the condensed water and recovering the crystals. According to the invention, the wastewater after deamination is desalted and desalted to generate fresh water, the fresh water and condensed water generated by concentrated water through a mechanical vapor recompression system are recovered together to be used as raw production water, and generated crystals are used as byproducts, so that not only is zero discharge of the wastewater realized, but also the byproducts generated in the treatment process are effectively utilized, and the maximum cyclic utilization of resources is realized.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a precursor synthesis wastewater desalination system.
Background
A large amount of wastewater is generated in the production process of the ternary precursor, and is discharged after being treated in the past, and with the increasing requirement on environmental protection, how to reduce the wastewater discharge is an important problem, so that the wastewater generated by the prior art needs to be treated to reach the level of industrial water for recycling.
The traditional treatment process comprises a steam stripping-freezing crystallization process and a steam stripping-traditional deamination-freezing crystallization process, but the traditional treatment process has the problems of low treatment efficiency, high operation cost, low recovery rate of sodium sulfate, high salinity of discharged water, secondary pollution and the like.
Disclosure of Invention
The invention provides a precursor synthesis wastewater desalination system, which aims to solve the technical problems of low treatment efficiency, low recovery rate and secondary pollution in the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides a system for desalinating precursor synthesis wastewater, including: a pretreatment system, a desalination system and a mechanical vapor recompression system;
the pretreatment system is used for adjusting the value of the wastewater, stripping and deaminating the wastewater, recovering the generated ammonia water, and intercepting and adjusting the value of precipitates of the deaminated wastewater;
the desalination system is used for pressurizing and desalinating the deaminated wastewater to generate fresh water and concentrated water, and storing the fresh water;
and the mechanical vapor recompression system is used for evaporating the concentrated water generated by the desalination system to obtain condensed water and crystals, storing the condensed water and recovering the crystals.
As a preferred scheme, the pretreatment system comprises a value regulating water tank, a deamination tower, a filtering system and a wastewater collecting tank;
the value regulating water tank is used for carrying out acid-base value regulation on the wastewater;
the deamination tower is used for performing steam stripping deamination on the wastewater output by the value-regulated water tank and subjected to acid-base value regulation to generate ammonia water and deamination wastewater, and recovering the ammonia water generated after deamination;
the filtering system is used for intercepting metal flocculent precipitates of the deamination wastewater generated in the deamination tower;
and the wastewater collection tank is used for collecting wastewater output by the filtering system.
As a preferred scheme, the wastewater collection tank is further provided with a first dosing device, and the first dosing device is used for adjusting the value of wastewater in the wastewater collection tank.
Preferably, the desalination system comprises: a reverse osmosis desalination system and a backwashing system;
the reverse osmosis desalination system is provided with a multi-stage reverse osmosis module and a storage tank, and the multi-stage reverse osmosis module is used for pressurizing, desalting and desalinating the wastewater output by the pretreatment system, so that the multi-stage reverse osmosis module generates concentrated water at a pressurizing end and generates fresh water at the other end; the storage tank is used for storing desalted water which is output by the multistage reverse osmosis module and is desalted;
and the back-washing system is used for back-washing the multistage reverse osmosis module according to a preset time period and recovering metals in back-washing water generated by back-washing.
As a preferred scheme, a second dosing device is arranged in the backwashing system and is used for providing bacteriostatic agents and scale inhibitors for the backwashing system.
Preferably, the reverse osmosis membranes in the multistage reverse osmosis modules are distributed in a three-dimensional manner by using supports, and water in the multistage reverse osmosis modules flows to the storage tank by gravity for storage.
Preferably, the method further comprises the following steps: a monitoring system; the monitoring system is used for monitoring the wastewater treatment process and monitoring the water quality.
Preferably, the monitoring system comprises a pool liquid level radar, a pH probe, a flow velocity probe, a pipeline pressure probe, a conductivity probe and an oxidation-reduction potential probe.
Preferably, the mechanical vapor recompression system comprises a centrifuge, an evaporator and a plate heat exchanger;
the centrifugal machine is used for carrying out centrifugal treatment on the concentrated water output from the desalination system;
the evaporator is used for evaporating the concentrated water after centrifugal treatment to obtain evaporated water vapor and precipitated crystals;
the plate heat exchanger is used for condensing the evaporated water vapor to obtain condensed water.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, ammonia water is recycled through the front-end pretreatment system, most of precipitates are intercepted, the stable operation of the rear-end desalination system is ensured, the fault rate of the desalination system is reduced, the stable and durable operation of the system is ensured, simultaneously, wastewater after deamination is desalted and desalted, generated fresh water is collected and is recycled together with condensed water generated by concentrated water through the mechanical steam recompression system to serve as raw production water, generated crystals serve as byproducts, the zero discharge of wastewater is realized, the byproducts generated in the treatment process are effectively utilized, the maximum cyclic utilization of resources is realized, and the design and production completely meet the requirements of green development concept.
Drawings
FIG. 1: the structural schematic diagram of the precursor synthesis wastewater desalination system provided by the embodiment of the invention;
FIG. 2: the embodiment of the invention provides a schematic structural diagram of the rear end of a precursor synthesis wastewater desalination system.
Wherein the reference numbers of the drawings in the specification are as follows:
the system comprises a pretreatment system 101, a desalination system 102, a mechanical vapor recompression system 103 and a monitoring system 104;
the device comprises an oxidation-reduction potential probe 1, a first conductivity probe 2, a pool liquid level radar 3, a first pipeline pressure probe 4, a second pipeline pressure probe 5, a pH probe 6, a conductivity probe 7, two groups of permeation membrane groups 8, a single group of permeation membrane group 9, a collecting tank 10 and a backwashing system 11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The traditional precursor synthesis wastewater treatment system adopts a steam stripping and freezing crystallization process, ammonia nitrogen in wastewater is reduced after washing water is mixed with mother liquor, the efficiency of recovering ammonia nitrogen by steam stripping is influenced, the design treatment capacity of steam stripping needs to be increased, and the investment and the operation cost of steam stripping are increased. When the freezing crystallization process is adopted, the removal rate of sodium sulfate is about 50%, and the salt content in the discharged water is about 50g/L, so that increasingly strict requirements of environmental emission standards are difficult to meet.
The embodiment of the invention provides that the front end adopts stripping deamination, recovered ammonia water is pumped to the front end synthesis process for use, a precise filter intercepts and recycles metal floccules, an MVR evaporation system is used for evaporating concentrated water after concentration of a reverse osmosis membrane system, condensed water generated by evaporation is delivered to a fresh water tank, and crystallized, centrifugally dried and used as a byproduct glauber salt for external sale. Recovering and recycling ammonia and heavy metals in the wastewater; the by-product anhydrous sodium sulphate can be sold as a chemical raw material, and the by-product distilled water and the water produced by the desalination system 102 are returned to the production process as raw water of a pure water system for use. Realizing zero discharge of waste water and recycling waste.
Example one
Referring to fig. 1, a precursor synthesis wastewater desalination system 102 provided by an embodiment of the present invention includes: a pre-treatment system 101, a desalination system 102, a monitoring system 104, and a mechanical vapor recompression system 103.
The pretreatment system 101 is used for adjusting the value of the wastewater, stripping and deaminating the wastewater, recovering the generated ammonia water, and intercepting and adjusting the value of the precipitate of the deaminated wastewater.
As a preferable scheme of the embodiment, the pretreatment system 101 comprises a value regulating water tank, a deamination tower, a filtering system and a wastewater collecting tank.
And the value regulating pool is used for carrying out acid-base value regulation on the wastewater.
And the deamination tower is used for performing steam stripping deamination on the wastewater subjected to acid-base value regulation and output by the value regulating pool to generate ammonia water and deamination wastewater, and recovering the ammonia water generated after deamination.
And the filtering system is used for intercepting the metal flocculent precipitate of the deamination wastewater generated in the deamination tower.
And the wastewater collection tank is used for collecting the wastewater output by the filtering system.
As the preferred scheme of this embodiment, waste water collecting pit still installs first charge device, first charge device is used for adjusting the value to the waste water in the waste water collecting pit.
The wastewater after value adjustment is sent to a deamination tower, ammonia water is recovered by stripping deamination (the concentration of the recovered ammonia water can reach 9% -10%), wastewater after deamination is collected and intercepted by a precision filter, the intercepted metal is effectively recovered, and the wastewater is put into the previous working procedure for leaching and recycling. Meanwhile, a first dosing device is installed in the deamination waste water collecting tank and used for adjusting the value of the deamination waste water, so that the deamination waste water reaches the standard of bringing the deamination waste water into the desalination system 102.
Referring to fig. 2, a desalination system 102, a monitoring system 104 and a mechanical vapor recompression system 103 are shown at the rear end of the embodiment.
And the desalination system 102 is used for pressurizing and desalinating the deaminated wastewater to generate fresh water and concentrated water, and storing the fresh water.
As a preferred solution of this embodiment, the desalination system 102 includes: a reverse osmosis desalination system 102 and a backwash system.
The reverse osmosis desalination system 102 is provided with a multi-stage reverse osmosis module and a storage tank, and the multi-stage reverse osmosis module is used for pressurizing, desalting and desalinating the wastewater output by the pretreatment system 101, so that the multi-stage reverse osmosis module generates concentrated water at a pressurizing end and generates fresh water at the other end; the storage tank is used for storing the desalted water which is output by the multistage reverse osmosis module and is desalted.
As the preferred scheme of this embodiment, the reverse osmosis membrane in the multistage reverse osmosis module adopts support three-dimensional distribution, and the water of multistage reverse osmosis module flows to the storage tank through gravity and stores.
It should be noted that, in the process of desalting the precursor synthesis wastewater, the reverse osmosis membrane is an important link for desalting the wastewater. Reverse osmosis equipment is handled to waste water desalination water utilizes reverse osmosis membrane to part aquatic moisture and salinity, is a pellicle at reverse osmosis membrane, and the solvent can see through and the solute can not see through, and high pressure is applyed to intaking in reverse osmosis membrane one side, and then partly pure water can see through reverse osmosis membrane arrival opposite side in the waste water, output fresh water, and the salinity is discharged along with dense water. The reverse osmosis membrane has higher requirement on the water quality of raw material water, needs more complex pretreatment, has strict pretreatment requirement, and ensures the service life of the reverse osmosis membrane.
Further, as another preferred scheme of this embodiment, before input to desalination system 102, can also further filter the waste water of input desalination system 102 through setting up the security filter, preferably security filter adopts 5um filter cores to hold back impurity, guarantees to reach the raw water quality in desalination system 102, reduces reverse osmosis membrane fault rate, improves reverse osmosis membrane's life.
Meanwhile, the integral components of the multistage reverse osmosis module in the desalination system 102 are distributed in a three-dimensional manner by adopting supports, so that the occupied area is reduced, and the generated fresh water and concentrated water flow to a bottom storage tank by gravity to be stored. A two-stage reverse osmosis membrane system is arranged in the multistage reverse osmosis module, one stage is two groups of permeation membrane groups 8, the other stage is a single group of permeation module group 9, and waste water after deamination is efficiently desalted.
And the backwashing system 11 is used for backwashing the multistage reverse osmosis module according to a preset time period and recovering metals in backwashing water generated by backwashing.
It should be noted that the backwashing system 11 is disposed below the desalination system 102, and is configured to backwash the membrane module according to a program setting time, and backwash wastewater is collected by the collection tank 10 below the desalination system 102. A small amount of metal precipitates are contained in the backwashing wastewater, and are recycled by a plate frame machine.
As a preferred scheme of this embodiment, be provided with the second charge device in the back flush system, the second charge device is used for the back flush system provides bacteriostatic agent and antisludging agent.
It should be noted that the dosing frequency of the second dosing device is programmed by software, the size of the metering pump is fixed after debugging, and then the dosing pump is adjusted according to the subsequent water quality. The bacteriostatic agent and the scale inhibitor can provide a protective effect for the reverse osmosis membrane which is subjected to long-time osmotic filtration, and the reduction of the filtration efficiency of scale stains on the reverse osmosis membrane caused by long-time filtration is avoided.
It can be understood that through the mutual cooperation of the pretreatment and desalination systems 102, the precursor synthetic wastewater can be effectively desalinated, and on the premise of ensuring the water quality of the desalinated wastewater, the fault rate of the reverse osmosis membrane is effectively reduced, and the service life is prolonged.
As a preferable scheme of this embodiment, the monitoring system 104 is further included; the monitoring system 104 is used for monitoring the wastewater treatment process and monitoring the water quality.
Preferably, the monitoring system 104 includes a pool level radar, a pH probe, a flow rate probe, a line pressure probe, a conductivity probe, and an oxidation-reduction potential probe.
In the embodiment, an oxidation-reduction potential probe 1, a first conductivity probe 2, a pool liquid level radar 3 and a first pipeline pressure probe 4 are arranged at the front end of the desalination system 102, and a second pipeline pressure probe 5, a pH probe 6 and a conductivity probe 7 are arranged at the rear end of the desalination system 102.
It should be noted that the liquid level radar level gauge of each water tank ensures that the water tank does not overflow, the pH probe monitors the pH value of fresh water, the automation of the dispensing system is realized, the pipeline pressure probe and the conductivity probe monitor the operation and working process of the multistage reverse osmosis module, and the stable and safe operation of the device is ensured.
The mechanical vapor recompression system 103 is configured to evaporate the concentrated water generated by the desalination system 102 to obtain condensed water and crystals, store the condensed water, and recover the crystals.
As a preferable solution of this embodiment, the mechanical vapor recompression system 103 includes a centrifuge, an evaporator and a plate heat exchanger.
It should be noted that the mechanical vapor recompression system 103 (MVR system) of this embodiment includes a plate heat exchanger, an evaporator, a concentrator, a centrifuge, and a mother liquor collecting tank, and evaporates the concentrated water generated by the desalination system 102, and the condensed water is discharged to a fresh water tank, and the precipitated crystals are packed and recovered after being centrifugally dried.
The centrifuge is used for carrying out centrifugal treatment on the concentrated water output from the desalination system 102.
The evaporator is used for evaporating the concentrated water after centrifugal treatment to obtain evaporated water vapor and precipitated crystals.
The plate heat exchanger is used for condensing the evaporated water vapor to obtain condensed water.
It should be noted that the obtained condensed water and the fresh water obtained from the desalination system can be used as production water together, and the pretreatment system and the desalination system in the system are subjected to operations such as deamination, value adjustment and infiltration, but in actual production operation, most of the condensed water and the fresh water obtained from the desalination system are input into an external pure water system and used as raw water of the pure water production system; wherein, the pure water system can purify the condensate water and the fresh water of output to obtain industrial or domestic water.
The above embodiment is implemented, and has the following effects:
according to the technical scheme, the ammonia water is recycled through the front-end pretreatment system, most of precipitates are intercepted, the stable operation of a rear-end desalination system is guaranteed, the fault rate of the desalination system is reduced, the stable and durable operation of the system is guaranteed, meanwhile, the deaminated wastewater is desalted and desalted, the generated fresh water is collected and is recycled as raw production water together with condensed water generated by concentrated water through a mechanical steam recompression system, generated crystals are used as byproducts, the zero discharge of the wastewater is realized, the byproducts generated in the treatment process are effectively utilized, the resource is recycled to the maximum extent, the design and production completely meet the requirements of green development concepts, in addition, the method that a reverse osmosis membrane group is combined with the mechanical steam recompression system is adopted for recycling the production wastewater, the concentrated water obtained after the reverse osmosis membrane concentration is evaporated, and the recycling cost is saved.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (9)
1. A precursor synthesis wastewater desalination system is characterized by comprising: a pretreatment system, a desalination system and a mechanical vapor recompression system;
the pretreatment system is used for adjusting the value of the wastewater, stripping and deaminating the wastewater, recovering the generated ammonia water, and intercepting and adjusting the value of precipitates of the deaminated wastewater;
the desalination system is used for pressurizing and desalinating the deaminated wastewater to generate fresh water and concentrated water, and storing the fresh water;
and the mechanical vapor recompression system is used for evaporating the concentrated water generated by the desalination system to obtain condensed water and crystals, storing the condensed water and recovering the crystals.
2. The desalination system for precursor synthesis wastewater as defined in claim 1, wherein the pretreatment system comprises a value regulating water tank, a deamination tower, a filtration system and a wastewater collection tank;
the value regulating water tank is used for carrying out acid-base value regulation on the wastewater;
the deamination tower is used for performing steam stripping deamination on the wastewater output by the value-regulated water tank and subjected to acid-base value regulation to generate ammonia water and deamination wastewater, and recovering the ammonia water generated after deamination;
the filtering system is used for intercepting metal flocculent precipitates of the deamination wastewater generated in the deamination tower;
and the wastewater collection tank is used for collecting wastewater output by the filtering system.
3. The desalination system for precursor synthesis wastewater of claim 2, wherein the wastewater collection tank is further provided with a first chemical adding device, and the first chemical adding device is used for adjusting the value of wastewater in the wastewater collection tank.
4. The desalination system of precursor synthesis wastewater of claim 1, wherein the desalination system comprises: a reverse osmosis desalination system and a backwashing system;
the reverse osmosis desalination system is provided with a multi-stage reverse osmosis module and a storage tank, and the multi-stage reverse osmosis module is used for pressurizing, desalting and desalinating the wastewater output by the pretreatment system, so that the multi-stage reverse osmosis module generates concentrated water at a pressurizing end and generates fresh water at the other end; the storage tank is used for storing desalted water which is output by the multistage reverse osmosis module and is desalted;
and the backwashing system is used for backwashing the multistage reverse osmosis module according to a preset time period and recovering metals in backwashing water generated by backwashing.
5. The desalination system for precursor synthesis wastewater of claim 4, wherein a second dosing device is arranged in the backwashing system, and the second dosing device is used for providing bacteriostatic agents and scale inhibitors for the backwashing system.
6. The system for desalinating precursor synthesis wastewater according to claim 4, wherein the reverse osmosis membranes in the multistage reverse osmosis module are spatially distributed by using a support, and water in the multistage reverse osmosis module flows to the storage tank by gravity for storage.
7. The system for desalinating precursor synthesis wastewater according to claim 1, further comprising: a monitoring system; the monitoring system is used for monitoring the wastewater treatment process and monitoring the water quality.
8. The system for desalinating precursor synthesis wastewater according to claim 7, wherein the monitoring system comprises a pool liquid level radar, a pH probe, a flow rate probe, a line pressure probe, a conductivity probe, and an oxidation-reduction potential probe.
9. The desalination system for precursor synthesis wastewater of claim 1, wherein the mechanical vapor recompression system comprises a centrifuge, an evaporator, and a plate heat exchanger;
the centrifugal machine is used for carrying out centrifugal treatment on the concentrated water output from the desalination system;
the evaporator is used for evaporating the concentrated water after centrifugal treatment to obtain evaporated water vapor and precipitated crystals;
the plate heat exchanger is used for condensing the evaporated water vapor to obtain condensed water.
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| CN202211062261.7A CN115417547A (en) | 2022-09-01 | 2022-09-01 | Precursor synthesis wastewater desalination system |
| PCT/CN2023/082260 WO2024045563A1 (en) | 2022-09-01 | 2023-03-17 | Precursor synthesis-based wastewater desalination system |
| FR2308243A FR3139333A1 (en) | 2022-09-01 | 2023-07-28 | Precursor Synthesis Wastewater Desalination System |
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| WO2024045563A1 (en) * | 2022-09-01 | 2024-03-07 | 宁德邦普循环科技有限公司 | Precursor synthesis-based wastewater desalination system |
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| CN213388200U (en) * | 2020-08-26 | 2021-06-08 | 长沙矿冶研究院有限责任公司 | Lithium battery anode material precursor wastewater treatment system |
| CN115417547A (en) * | 2022-09-01 | 2022-12-02 | 宁德邦普循环科技有限公司 | Precursor synthesis wastewater desalination system |
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| CN104812705A (en) * | 2012-11-27 | 2015-07-29 | 奥加诺株式会社 | Device for treating ammonia-containing wastewater, and method for treating ammonia-containing wastewater |
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