CN114804475A - High-hardness industrial wastewater induced crystallization removal device and method - Google Patents
High-hardness industrial wastewater induced crystallization removal device and method Download PDFInfo
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- CN114804475A CN114804475A CN202210264697.8A CN202210264697A CN114804475A CN 114804475 A CN114804475 A CN 114804475A CN 202210264697 A CN202210264697 A CN 202210264697A CN 114804475 A CN114804475 A CN 114804475A
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- 238000002425 crystallisation Methods 0.000 title claims abstract description 88
- 230000008025 crystallization Effects 0.000 title claims abstract description 84
- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 308
- 238000003860 storage Methods 0.000 claims abstract description 60
- 239000013078 crystal Substances 0.000 claims abstract description 23
- 150000003839 salts Chemical class 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims description 52
- 238000001223 reverse osmosis Methods 0.000 claims description 30
- 238000009292 forward osmosis Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 239000012141 concentrate Substances 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 238000001728 nano-filtration Methods 0.000 claims description 5
- 238000010979 pH adjustment Methods 0.000 claims description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract description 2
- 239000001110 calcium chloride Substances 0.000 abstract description 2
- 229910001628 calcium chloride Inorganic materials 0.000 abstract description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 description 10
- 239000003814 drug Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 229910021653 sulphate ion Inorganic materials 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward 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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a device and a method for removing high-hardness industrial wastewater through induced crystallization. According to the invention, the industrial wastewater is filtered and softened, and then concentrated to obtain concentrated solution, the concentrated solution is introduced into the crystallization unit, the concentrated solution is crystallized to obtain salt crystals, evaporated crystallization water is introduced into the water storage unit, and the salt crystals are treated and recovered in the same direction of the treatment unit to obtain calcium chloride and magnesium chloride crystals in the salt crystals, so that the wastewater treatment cost is reduced.
Description
Technical Field
The invention particularly relates to the technical field of sewage treatment, and particularly relates to a device and a method for removing high-hardness industrial wastewater through induced crystallization.
Background
Wastewater generated in the industrial production processes of electric power, metallurgy, chemical industry, seawater desalination, printing and dyeing, papermaking and the like generally contains higher hardness and higher salinity, the higher hardness mainly means that the total concentration of calcium and magnesium ions in the wastewater is high, and the wastewater can cause salinization of water and soil and harm the natural environment if being directly discharged without treatment.
At present, the softening method for the high-hardness wastewater mainly comprises a chemical method and an ion exchange method, wherein the chemical method is most common in the practical application of removing calcium and magnesium from various high-salt wastewater, and the main mechanism is to add a certain chemical agent into the wastewater to enable calcium and magnesium ions to form insoluble salt to be removed through precipitation or flocculation. The hardness of the high-salt-content wastewater is higher, the water amount is larger, the amount of chemicals required to be input by adopting a chemical method is correspondingly larger, and the cost is higher.
The invention patent with publication number CN107915351A discloses a system for treating high-hardness wastewater by self-crystallization of a combined fluidized bed, which comprises: the device comprises a self-crystallization fluidized bed reactor, a medicament A adding device and a medicament B adding device; the raw water pool is connected with a water inlet of the self-crystallizing fluidized bed reactor through a water inlet pipeline by a water inlet pump and a first pipeline mixer in sequence; the medicament A adding device is connected with the first pipeline mixer through a medicament A adding pipeline; the outer side of a water outlet of the self-crystallization fluidized bed reactor is connected with an external pipeline, and a suction pump is arranged on the external pipeline; the medicament B adding device is connected with a second pipeline mixer arranged on a water return pipeline of a circulating water system of the self-crystallization fluidized bed reactor through a medicament B adding pipeline;
the utility model discloses a utility model patent that publication number is CN205676307U discloses a high sulphate high rigidity waste water treatment composite set, including high sulphate high rigidity waste water tank, filter equipment, water-feeding pump, circulation water-feeding pump, first concentrated diverging device, circulation concentration back flow, chemical desiliconization device, middling pressure reverse osmosis enrichment facility, high-pressure membrane enrichment facility, evaporation crystallization device, calcium sulfate crystal add the device, alkali adds the device, calcium sulfate crystallization reaction precipitation unit, the concentrated diverging device of second, cooling crystallization device, back flow, organic compound antisludging agent and adds the device. The utility model discloses a combination of process units can realize not softening with the medicament, and makes the high hardness waste water of high sulphate realize the high rate of recovery, has reduced water treatment system's running cost.
Disclosure of Invention
The invention aims to provide a device and a method for removing high-hardness industrial wastewater through induced crystallization, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a high rigidity industrial waste water induction crystallization desorption device, includes water storage unit, filter unit, concentration unit and crystallization unit, wherein:
the water storage unit is used for receiving the industrial wastewater and the return water generated by the crystallization desulfurization device and leading the industrial wastewater and the return water to the filtering unit;
the filtering unit is used for receiving the industrial wastewater, filtering and softening the industrial wastewater to obtain residue-free water, and introducing the residue-free water into the concentrating unit;
the concentration unit is used for receiving residue-free water, concentrating the residue-free water to obtain a concentrated solution and concentrated return water, introducing the concentrated solution into the crystallization unit, and introducing the concentrated return water into the water storage unit;
and the crystallization unit is used for receiving the concentrated solution, crystallizing the concentrated solution to obtain salt crystals and water produced by evaporative crystallization, and introducing the water produced by evaporative crystallization into the water storage unit.
As a further scheme of the invention: the water outlet of the water storage unit is communicated with the water inlet of the concentration unit, the filtering unit is arranged between the water outlet of the water storage unit and the water inlet of the concentration unit, and the concentrated solution outlet of the concentration unit is communicated with the liquid inlet of the crystallization unit.
As a still further scheme of the invention: the water circulation unit is communicated with a condensed water outlet of water produced by the crystallization unit, and a slag inlet of the treatment unit is communicated with a slag discharge port of the crystallization unit.
As a still further scheme of the invention: the water storage unit comprises a water inlet pool, a water return pool and a circulating water pool, wherein first water inlet valves are arranged on drain pipes of the water inlet pool and the water return pool, and second water inlet valves are arranged on drain pipes of the circulating water pool.
As a still further scheme of the invention: the concentration unit is provided with a condensed water outlet, the condensed water outlet of the concentration unit is communicated with a water inlet of the circulating water pool, and the water circulating unit is communicated with the circulating water pool; the water return tank is communicated with a water return port of the concentration unit and used for receiving the concentrated return water discharged by the concentration unit.
As a still further scheme of the invention: the filtering unit comprises a filtering grid, a medium filter and a nanofiltration softener which are sequentially arranged along the flowing direction of water flow.
As a still further scheme of the invention: the concentration unit comprises a reverse osmosis device and a forward osmosis device, and a concentrated solution outlet of the reverse osmosis device is communicated with a liquid inlet of the forward osmosis device.
As a still further scheme of the invention: the water return port of the reverse osmosis device is communicated with the water storage unit, and the water return port of the forward osmosis device is communicated with the water inlet of the reverse osmosis device.
As a still further scheme of the invention: the device also comprises a pH adjusting unit which is arranged between the water storage unit and the filtering unit and is used for leading the industrial wastewater discharged by the water storage unit to the filtering unit after the pH adjustment.
A method for a device for removing high-hardness industrial wastewater through induced crystallization comprises the following steps:
s100, leading the industrial wastewater to a filtering unit, and filtering and softening the industrial wastewater to obtain residue-free water;
s200, introducing residue-free water into a concentration unit, concentrating the residue-free water to obtain a concentrated solution and concentrated return water, introducing the concentrated solution into a crystallization unit, and introducing the concentrated return water into a water storage unit for recycling;
s300, crystallizing the concentrated solution to obtain salt crystals and water produced by evaporative crystallization, introducing the water produced by evaporative crystallization into a water storage unit, and treating and recycling the salt crystals in a treatment unit in the same direction.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the industrial wastewater is filtered and softened, and then concentrated to obtain concentrated solution, the concentrated solution is introduced into the crystallization unit, the concentrated solution is crystallized to obtain salt crystals, evaporated crystallization water is introduced into the water storage unit, and the salt crystals are treated and recovered in the same direction of the treatment unit to obtain calcium chloride and magnesium chloride crystals in the salt crystals, so that the wastewater treatment cost is reduced.
Drawings
FIG. 1 is a block diagram showing the structure of an embodiment 1 of a high hardness industrial wastewater induced crystallization removal device.
FIG. 2 is a block diagram showing the structure of a water storage unit in a high hardness industrial wastewater induced crystallization removal device.
FIG. 3 is a block diagram of a filtering unit in a high hardness industrial wastewater induced crystallization removal device.
FIG. 4 is a block diagram of the structure of a concentration unit in the high hardness industrial wastewater induced crystallization removal device.
FIG. 5 is a block diagram of the structure of an embodiment 2 of the high hardness industrial wastewater induced crystallization removal device.
FIG. 6 is a flow chart of a method for removing high hardness industrial wastewater by induced crystallization.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1 to 4, in an embodiment of the present invention, a device for removing high-hardness industrial wastewater by induced crystallization includes a water storage unit 100, a filtering unit 200, a concentrating unit 300, and a crystallizing unit 400, wherein a water outlet of the water storage unit 100 is communicated with a water inlet of the concentrating unit 300, the filtering unit 200 is disposed between the water outlet of the water storage unit 100 and the water inlet of the concentrating unit 300, and a concentrated solution outlet of the concentrating unit 300 is communicated with a liquid inlet of the crystallizing unit 400, wherein:
a water storage unit 100 for receiving the industrial wastewater and the backwater generated from the crystallization desulfurization apparatus, and leading the industrial wastewater and the backwater to a filtering unit 200;
the filtering unit 200 is used for receiving industrial wastewater, filtering and softening the industrial wastewater to obtain residue-free water, and introducing the residue-free water into the concentrating unit 300;
the concentration unit 300 is configured to receive residue-free water, perform concentration treatment on the residue-free water to obtain a concentrated solution and concentrated return water, introduce the concentrated solution into the crystallization unit, and introduce the concentrated return water into the water storage unit 100;
and the crystallization unit 400 is used for receiving the concentrated solution, crystallizing the concentrated solution to obtain salt crystals and water produced by evaporative crystallization, and introducing the water produced by evaporative crystallization into the water storage unit 100.
Further, in the embodiment of the present invention, the water circulation unit 600 and the processing unit 500 are further included, a water inlet of the water circulation unit 600 is communicated with a condensed water outlet of the water produced by the crystallization unit 400, and a slag inlet of the processing unit 500 is communicated with a slag discharge port of the crystallization unit 400, and is configured to receive salt crystals of the water produced by the crystallization unit 400.
Referring to fig. 2, in the embodiment of the present invention, the water storage unit 100 includes a water inlet tank 110, a water return tank 120 and a circulating water tank 130, a first water inlet valve 140 is disposed on a water discharge pipe of the water inlet tank 110 and the water return tank 120, a second water inlet valve 150 is disposed on a water discharge pipe of the circulating water tank 130, it should be noted that the concentration unit 300 is also provided with a condensed water outlet, the condensed water outlet of the concentration unit 300 is communicated with a water inlet of the circulating water tank 130, and the water circulating unit 600 is communicated with the circulating water tank 130; and the water return tank 120 is communicated with a water return port of the concentration unit 300 and is used for receiving the concentrated return water discharged by the concentration unit 300.
Referring to fig. 3, in the embodiment of the present invention, the filtering unit 200 includes a filtering grid 210, a media filter 220, and a nanofiltration softener 230, which are sequentially disposed along a flow direction of a water stream, and are used for sequentially performing multi-stage filtering and softening treatment on industrial wastewater to obtain residue-free water.
Referring to fig. 4, in the embodiment of the present invention, the concentration unit 300 includes a reverse osmosis device 310 and a forward osmosis device 320, wherein a concentrate outlet of the reverse osmosis device 310 is communicated with a liquid inlet of the forward osmosis device 320, and is configured to introduce a concentrate generated by the reverse osmosis device 310 into the forward osmosis device 320, so as to perform a concentration treatment on the residue-free water;
furthermore, a water return port of the reverse osmosis device 310 is communicated with the water storage unit 100 and is used for introducing the concentrated return water generated by the reverse osmosis device 310 into the water storage unit 100; the water return port of the forward osmosis device 320 is communicated with the water inlet of the reverse osmosis device 310 and is used for introducing the concentrated return water generated by the forward osmosis device 320 into the reverse osmosis device 310 for cyclic treatment.
Example 2
Referring to fig. 1 to 4, in an embodiment of the present invention, a device for removing high-hardness industrial wastewater by induced crystallization includes a water storage unit 100, a filtering unit 200, a concentrating unit 300, and a crystallizing unit 400, wherein a water outlet of the water storage unit 100 is communicated with a water inlet of the concentrating unit 300, the filtering unit 200 is disposed between the water outlet of the water storage unit 100 and the water inlet of the concentrating unit 300, and a concentrated solution outlet of the concentrating unit 300 is communicated with a liquid inlet of the crystallizing unit 400, wherein:
a water storage unit 100 for receiving the industrial wastewater and the backwater generated from the crystallization desulfurization apparatus, and leading the industrial wastewater and the backwater to a filtering unit 200;
the filtering unit 200 is used for receiving industrial wastewater, filtering and softening the industrial wastewater to obtain residue-free water, and introducing the residue-free water into the concentrating unit 300;
the concentration unit 300 is configured to receive residue-free water, perform concentration treatment on the residue-free water to obtain a concentrated solution and concentrated return water, introduce the concentrated solution into the crystallization unit, and introduce the concentrated return water into the water storage unit 100;
and the crystallization unit 400 is used for receiving the concentrated solution, crystallizing the concentrated solution to obtain salt crystals and water produced by evaporative crystallization, and introducing the water produced by evaporative crystallization into the water storage unit 100.
Further, in the embodiment of the present invention, the water circulation unit 600 and the processing unit 500 are further included, a water inlet of the water circulation unit 600 is communicated with a condensed water outlet of the water produced by the crystallization unit 400, and a slag inlet of the processing unit 500 is communicated with a slag discharge port of the crystallization unit 400, and is configured to receive salt crystals of the water produced by the crystallization unit 400.
Referring to fig. 2, in the embodiment of the present invention, the water storage unit 100 includes a water inlet tank 110, a water return tank 120 and a circulating water tank 130, a first water inlet valve 140 is disposed on a water discharge pipe of the water inlet tank 110 and the water return tank 120, a second water inlet valve 150 is disposed on a water discharge pipe of the circulating water tank 130, it should be noted that the concentration unit 300 is also provided with a condensed water outlet, the condensed water outlet of the concentration unit 300 is communicated with a water inlet of the circulating water tank 130, and the water circulating unit 600 is communicated with the circulating water tank 130; furthermore, the water return tank 120 is communicated with a water return port of the concentration unit 300, and is configured to receive the concentrated return water discharged by the concentration unit 300.
Referring to fig. 3, in the embodiment of the present invention, the filtering unit 200 includes a filtering grid 210, a media filter 220, and a nanofiltration softener 230, which are sequentially disposed along a flow direction of a water stream, and are used for sequentially performing multi-stage filtering and softening treatment on industrial wastewater to obtain residue-free water.
Referring to fig. 4, in the embodiment of the present invention, the concentration unit 300 includes a reverse osmosis device 310 and a forward osmosis device 320, wherein a concentrate outlet of the reverse osmosis device 310 is communicated with a liquid inlet of the forward osmosis device 320, and is configured to introduce a concentrate generated by the reverse osmosis device 310 into the forward osmosis device 320, so as to perform a concentration treatment on the residue-free water;
furthermore, a water return port of the reverse osmosis device 310 is communicated with the water storage unit 100 and is used for introducing the concentrated return water generated by the reverse osmosis device 310 into the water storage unit 100; the water return port of the forward osmosis device 320 is communicated with the water inlet of the reverse osmosis device 310 and is used for introducing the concentrated return water generated by the forward osmosis device 320 into the reverse osmosis device 310 for cyclic treatment.
Referring to fig. 5, the embodiment of the invention is different from embodiment 1 in that:
the device also comprises a pH adjusting unit 700, wherein the pH adjusting unit 700 is arranged between the water storage unit 100 and the filtering unit 200 and is used for adjusting the pH of the industrial wastewater discharged from the water storage unit 100 and then leading the industrial wastewater to the filtering unit 200;
in the embodiment of the present invention, the pH adjusting unit 700 adjusts the pH of the industrial wastewater to 10 by adding sodium hydroxide to the industrial wastewater, and the reaction time is 30 min.
Example 3
Referring to fig. 1 to 4, in an embodiment of the present invention, a device for removing high-hardness industrial wastewater by induced crystallization includes a water storage unit 100, a filtering unit 200, a concentrating unit 300, and a crystallizing unit 400, wherein a water outlet of the water storage unit 100 is communicated with a water inlet of the concentrating unit 300, the filtering unit 200 is disposed between the water outlet of the water storage unit 100 and the water inlet of the concentrating unit 300, and a concentrated solution outlet of the concentrating unit 300 is communicated with a liquid inlet of the crystallizing unit 400, wherein:
a water storage unit 100 for receiving the industrial wastewater and the backwater generated from the crystallization desulfurization apparatus, and leading the industrial wastewater and the backwater to a filtering unit 200;
the filtering unit 200 is used for receiving industrial wastewater, filtering and softening the industrial wastewater to obtain residue-free water, and introducing the residue-free water into the concentrating unit 300;
the concentration unit 300 is configured to receive residue-free water, perform concentration treatment on the residue-free water to obtain a concentrated solution and concentrated return water, introduce the concentrated solution into the crystallization unit, and introduce the concentrated return water into the water storage unit 100;
and the crystallization unit 400 is used for receiving the concentrated solution, crystallizing the concentrated solution to obtain salt crystals and water produced by evaporative crystallization, and introducing the water produced by evaporative crystallization into the water storage unit 100.
Further, in the embodiment of the present invention, the water circulation unit 600 and the processing unit 500 are further included, a water inlet of the water circulation unit 600 is communicated with a condensed water outlet of the water produced by the crystallization unit 400, and a slag inlet of the processing unit 500 is communicated with a slag discharge port of the crystallization unit 400, and is configured to receive salt crystals of the water produced by the crystallization unit 400.
Referring to fig. 2, in the embodiment of the present invention, the water storage unit 100 includes a water inlet tank 110, a water return tank 120 and a circulating water tank 130, a first water inlet valve 140 is disposed on a water discharge pipe of the water inlet tank 110 and the water return tank 120, a second water inlet valve 150 is disposed on a water discharge pipe of the circulating water tank 130, it should be noted that the concentration unit 300 is also provided with a condensed water outlet, the condensed water outlet of the concentration unit 300 is communicated with a water inlet of the circulating water tank 130, and the water circulating unit 600 is communicated with the circulating water tank 130; furthermore, the water return tank 120 is communicated with a water return port of the concentration unit 300, and is configured to receive the concentrated return water discharged by the concentration unit 300.
Referring to fig. 3, in the embodiment of the present invention, the filtering unit 200 includes a filtering grid 210, a media filter 220, and a nanofiltration softener 230, which are sequentially disposed along a flow direction of a water stream, and are used for sequentially performing multi-stage filtering and softening treatment on industrial wastewater to obtain residue-free water.
Referring to fig. 4, in the embodiment of the present invention, the concentration unit 300 includes a reverse osmosis device 310 and a forward osmosis device 320, wherein a concentrate outlet of the reverse osmosis device 310 is communicated with a liquid inlet of the forward osmosis device 320, and is configured to introduce a concentrate generated by the reverse osmosis device 310 into the forward osmosis device 320, so as to perform a concentration treatment on the residue-free water;
furthermore, a water return port of the reverse osmosis device 310 is communicated with the water storage unit 100 and is used for introducing the concentrated return water generated by the reverse osmosis device 310 into the water storage unit 100; the water return port of the forward osmosis device 320 is communicated with the water inlet of the reverse osmosis device 310 and is used for introducing the concentrated return water generated by the forward osmosis device 320 into the reverse osmosis device 310 for cyclic treatment.
Referring to fig. 5, the embodiment of the invention is different from embodiment 1 in that:
the device also comprises a pH adjusting unit 700, wherein the pH adjusting unit 700 is arranged between the water storage unit 100 and the filtering unit 200 and is used for adjusting the pH of the industrial wastewater discharged from the water storage unit 100 and then leading the industrial wastewater to the filtering unit 200;
in the embodiment of the present invention, the pH adjusting unit 700 adjusts the pH of the industrial wastewater to 10 by adding sodium hydroxide to the industrial wastewater, and the reaction time is 30 min.
Referring to fig. 6, an embodiment of the present invention further discloses a method for removing high-hardness industrial wastewater by induced crystallization, including the following steps:
s100, leading the industrial wastewater to a filtering unit, and filtering and softening the industrial wastewater to obtain residue-free water;
s200, introducing residue-free water into a concentration unit, concentrating the residue-free water to obtain a concentrated solution and concentrated return water, introducing the concentrated solution into a crystallization unit, and introducing the concentrated return water into a water storage unit for recycling;
s300, crystallizing the concentrated solution to obtain salt crystals and water produced by evaporative crystallization, introducing the water produced by evaporative crystallization into a water storage unit, and treating and recycling the salt crystals in a treatment unit in the same direction.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A high-hardness industrial wastewater induced crystallization removal device is characterized by comprising a water storage unit (100), a filtering unit (200), a concentrating unit (300) and a crystallizing unit (400), wherein:
a water storage unit (100) for receiving the industrial wastewater and the return water generated by the crystallization desulfurization device, and leading the industrial wastewater and the return water to a filtering unit (200);
the filtering unit (200) is used for receiving the industrial wastewater, filtering and softening the industrial wastewater to obtain residue-free water, and introducing the residue-free water into the concentrating unit (300);
the concentration unit (300) is used for receiving residue-free water, concentrating the residue-free water to obtain concentrated solution and concentrated return water, introducing the concentrated solution into the crystallization unit, and introducing the concentrated return water into the water storage unit (100);
and the crystallization unit (400) is used for receiving the concentrated solution, crystallizing the concentrated solution to obtain salt crystals and water produced by evaporative crystallization, and introducing the water produced by evaporative crystallization into the water storage unit (100).
2. The high-hardness industrial wastewater induced crystallization removal device according to claim 1, wherein the water outlet of the water storage unit (100) is communicated with the water inlet of the concentration unit (300), the filtration unit (200) is arranged between the water outlet of the water storage unit (100) and the water inlet of the concentration unit (300), and the concentrated solution outlet of the concentration unit (300) is communicated with the liquid inlet of the crystallization unit (400).
3. The high-hardness industrial wastewater induced crystallization removal device according to claim 2, further comprising a water circulation unit (600) and a treatment unit (500), wherein a water inlet of the water circulation unit (600) is communicated with a condensed water outlet of water produced by the crystallization unit (400), and a slag inlet of the treatment unit (500) is communicated with a slag outlet of the crystallization unit (400).
4. The high-hardness industrial wastewater induced crystallization removal device according to claim 1, wherein the water storage unit (100) comprises a water inlet tank (110), a water return tank (120) and a circulating water tank (130), a first water inlet valve (140) is arranged on a water discharge pipe of the water inlet tank (110) and the water return tank (120), and a second water inlet valve (150) is arranged on a water discharge pipe of the circulating water tank (130).
5. The high-hardness industrial wastewater induced crystallization removal device according to claim 4, wherein the concentration unit (300) is provided with a condensed water outlet, the condensed water outlet of the concentration unit (300) is communicated with a water inlet of the circulating water tank (130), and the water circulating unit (600) is communicated with the circulating water tank (130); the water return pool (120) is communicated with a water return port of the concentration unit (300) and used for receiving concentrated return water discharged by the concentration unit (300).
6. The high-hardness industrial wastewater induced crystallization removal apparatus as claimed in claim 1, wherein the filtering unit (200) comprises a filtering grid (210), a media filter (220) and a nanofiltration softener (230) which are sequentially arranged in a flow direction of a water stream.
7. The high-hardness industrial wastewater induced crystallization removal device according to claim 1, wherein the concentration unit (300) comprises a reverse osmosis device (310) and a forward osmosis device (320), and a concentrate outlet of the reverse osmosis device (310) is communicated with a liquid inlet of the forward osmosis device (320).
8. The high-hardness industrial wastewater induced crystallization removal device according to claim 7, wherein the water return port of the reverse osmosis device (310) is communicated with the water storage unit (100), and the water return port of the forward osmosis device (320) is communicated with the water inlet port of the reverse osmosis device (310).
9. The high-hardness industrial wastewater induced crystallization removal device according to claim 1, further comprising a pH adjusting unit (700), wherein the pH adjusting unit (700) is disposed between the water storage unit (100) and the filtering unit (200) and is used for leading the industrial wastewater discharged from the water storage unit (100) to the filtering unit (200) after being subjected to pH adjustment.
10. The method of the high hardness industrial wastewater induced crystallization removal apparatus as claimed in any one of claims 1 to 9, comprising the steps of:
s100, leading the industrial wastewater to a filtering unit, and filtering and softening the industrial wastewater to obtain residue-free water;
s200, introducing residue-free water into a concentration unit, concentrating the residue-free water to obtain a concentrated solution and concentrated return water, introducing the concentrated solution into a crystallization unit, and introducing the concentrated return water into a water storage unit for recycling;
s300, crystallizing the concentrated solution to obtain salt crystals and water produced by evaporative crystallization, introducing the water produced by evaporative crystallization into a water storage unit, and treating and recycling the salt crystals in a treatment unit in the same direction.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6416668B1 (en) * | 1999-09-01 | 2002-07-09 | Riad A. Al-Samadi | Water treatment process for membranes |
| CN105036393A (en) * | 2015-07-07 | 2015-11-11 | 北京沃特尔水技术股份有限公司 | Treating method and apparatus for high-hardness high-salinity waste water |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6416668B1 (en) * | 1999-09-01 | 2002-07-09 | Riad A. Al-Samadi | Water treatment process for membranes |
| CN105036393A (en) * | 2015-07-07 | 2015-11-11 | 北京沃特尔水技术股份有限公司 | Treating method and apparatus for high-hardness high-salinity waste water |
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Application publication date: 20220729 |