CN113968650A - System and method for recycling wastewater generated in pseudoboehmite production - Google Patents
System and method for recycling wastewater generated in pseudoboehmite production Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 128
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 title claims abstract description 73
- 238000004064 recycling Methods 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000000126 substance Substances 0.000 claims abstract description 25
- 238000001728 nano-filtration Methods 0.000 claims abstract description 24
- 239000007787 solid Substances 0.000 claims abstract description 21
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 20
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 19
- 238000002425 crystallisation Methods 0.000 claims abstract description 19
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 19
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 19
- 230000008025 crystallization Effects 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 238000005189 flocculation Methods 0.000 claims description 23
- 230000016615 flocculation Effects 0.000 claims description 23
- 238000005406 washing Methods 0.000 claims description 21
- 239000013505 freshwater Substances 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 230000002431 foraging effect Effects 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 abstract description 9
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 239000010865 sewage Substances 0.000 description 8
- 150000002500 ions Chemical class 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- -1 sulfate Chemical class 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000009297 electrocoagulation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
-
- 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
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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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
- 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
- C02F1/44—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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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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
- 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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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- 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
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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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
- C02F2209/19—SO4-S
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- C02F2209/29—Chlorine compounds
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Abstract
The invention relates to a system for recycling wastewater generated in pseudo-boehmite production, which comprises a regulating reservoir, a suspended matter device, a multi-medium filter, a nanofiltration device, a reverse osmosis device, an MVR device and a crystallization device which are sequentially connected. The invention also relates to a method for recycling the wastewater generated in the production of pseudo-boehmite, which comprises the following steps: (1) the wastewater enters an adjusting tank to adjust the pH value of the wastewater; (2) the wastewater enters a suspended matter device to remove suspended matters in the wastewater to obtain solid suspended matters and wastewater from which the suspended matters are removed; (3) the wastewater from which the suspended substances are removed enters a multi-media filter to remove insoluble substances in the wastewater; (4) then the concentrated water enters a nanofiltration device for primary concentration and removal of part of divalent salt, and the concentrated water produced by the nanofiltration device continues to enter a reverse osmosis device for further concentration to obtain concentrated water; (5) the concentrated water enters an MVR device for further concentration; (6) and (4) enabling concentrated water after further concentration to enter a crystallization device, and crystallizing and separating sodium sulfate solid.
Description
Technical Field
The invention belongs to the technical field of oil refining catalyst sewage treatment, and particularly relates to a system and a method for recycling pseudo-boehmite production wastewater.
Background
Porous Al2O3The method is characterized in that a large amount of wastewater discharged in the production process (commonly called pseudo-boehmite) generates 13-15 tons of wastewater when 1 ton of catalyst pseudo-boehmite is produced, the wastewater is mainly generated in the washing process of a filter, the wastewater contains certain content of pseudo-boehmite particles, sulfate, chloride and the like, 98 percent of the wastewater exists in the form of sodium sulfate, the concentration of the wastewater is over 20000-30000 mg/L, and if the wastewater is directly discharged, a large amount of water resources are wasted.
Along with the strictness of national environmental protection legislation, the salt limit of discharged sewage is promoted, and the method adopts 'sewage diversion, differential treatment, source treatment and reasonable utilization' as an optimized way for the sewage treatment of a catalyst production plant according to the characteristics of the sewage generated by different production sections aiming at a catalyst production device. Aiming at the wastewater, as the main salt in the wastewater is sodium sulfate and the components are single, the recycling of the high-purity sodium sulfate wastewater and the recycling of water are realized, and the key point of low-cost sewage treatment is to prevent the wastewater from entering a comprehensive water tank to be mixed into mixed salt and reduce the difficulty of subsequent sewage treatment.
Disclosure of Invention
Aiming at the problems, the invention provides a system and a method for recycling pseudo-boehmite production wastewater, which solve the problem of recycling the existing pseudo-boehmite production wastewater.
Therefore, the invention provides a system for recycling wastewater generated in the production of pseudo-boehmite, which comprises a regulating reservoir, a suspended matter device, a multi-medium filter, a nanofiltration device, a reverse osmosis device, an MVR device and a crystallization device which are sequentially connected.
The system for recycling the wastewater generated in the pseudoboehmite production is characterized in that the pH value of the wastewater in the regulating tank is preferably less than or equal to 10.
The system for recycling the wastewater generated in the production of the pseudo-boehmite is characterized in that the suspension device is preferably a magnetic flocculation device or an electric flocculation device.
The system for recycling the wastewater generated in the production of the pseudo-boehmite is characterized in that the suspension device is preferably connected with a crystallization tank.
The system for recycling the wastewater from the pseudoboehmite production of the invention preferably comprises pseudoboehmite suspended particles, sulfate and chloride, wherein 98 wt% of solute in the wastewater is sodium sulfate, and the concentration of the wastewater is more than 20000 mg/L.
Therefore, the invention also provides a method for recycling the wastewater generated in the production of pseudo-boehmite, which comprises the following steps:
(1) the wastewater enters an adjusting tank to adjust the pH value of the wastewater;
(2) the wastewater enters a suspended matter device to remove suspended matters in the wastewater to obtain solid suspended matters and wastewater from which the suspended matters are removed;
(3) the wastewater from which the suspended substances are removed enters a multi-media filter to remove insoluble substances in the wastewater;
(4) then the fresh water produced by the nanofiltration device is used for producing clean water to be recycled to the pseudo-boehmite washing procedure, and the concentrated water produced by the nanofiltration device is continuously fed into a reverse osmosis device for further concentration to obtain concentrated water;
(5) fresh water generated in the concentration process of the reverse osmosis device is also used for producing clean water for recycling to the pseudo-boehmite washing process, concentrated water enters the MVR device for further concentration, and evaporated condensed water generated by the MVR device is also used for producing clean water for recycling to the pseudo-boehmite washing process;
(6) and (5) feeding the concentrated water subjected to further concentration in the step (5) into a crystallization device, and crystallizing and separating out a sodium sulfate solid.
In the method for recycling the wastewater from the pseudoboehmite production, the pH value of the wastewater is preferably adjusted to be less than or equal to 10 in the step (1).
The invention relates to a method for recycling wastewater generated in pseudoboehmite production, wherein a magnetic flocculation device or an electric flocculation device is preferably used as a suspended matter device.
In the method for recycling the wastewater from the pseudoboehmite production, in the step (2), the solid suspended substance preferably enters a crystallizing tank for aging treatment.
The method for recycling the pseudo-boehmite production wastewater, disclosed by the invention, has the advantages that the sulfate radical mass content is preferably not higher than 0.5% and the chloride mass content is preferably not higher than 1% in the clean water.
The method for recycling the wastewater from the pseudoboehmite production comprises the following steps of preferably, wherein the wastewater contains pseudoboehmite suspended particles, sulfate and chloride, 98 wt% of compounds in the wastewater is sodium sulfate, and the concentration of the wastewater is more than 20000 mg/L.
The invention has the following beneficial effects:
after the system regulates the pH value of the wastewater in the regulating tank, suspended matters in the wastewater are removed to the maximum extent through the suspended matter device, and suspended matter solids are recycled; divalent ion and monovalent ion in the wastewater are separated by combining nanofiltration, divalent ion (sulfate radical) is maximally enriched and concentrated on the concentrated water side, and more than 99% of sulfate radical is recovered; then, sodium sulfate in the pseudo-boehmite waste water is crystallized and evaporated by an existing MVR evaporation crystallization device, high-purity sodium sulfate is generated for sale during recovery, condensed water of evaporation crystallization and nanofiltration produced water are mixed and then directly reused in the production process, so that the water resource recycling of the pseudo-boehmite washing process is realized to the greatest extent, and the purpose of waste water recycling is achieved.
The suspended matter device of the invention adopts the magnetic flocculation device or the electric flocculation device to remove the suspended matters in the wastewater to the maximum extent, and other chemical substances are not introduced in the suspended matter removing process, so that valuable solid suspended matters can be recycled.
Drawings
FIG. 1 is a schematic structural diagram of a system for recycling wastewater from pseudoboehmite production according to the present invention.
Fig. 2 is a schematic structural diagram of a system for recycling wastewater from pseudoboehmite production according to an embodiment of the present invention.
Reference numerals:
1-a regulating reservoir; 2-suspension device; 21-an electrocoagulation device; 3-a multi-media filter; 4-a nanofiltration device; 5, a reverse osmosis device; 6-an MVR device; 7-crystallization device.
Detailed Description
The following examples illustrate the invention in detail: the present example is carried out on the premise of the technical scheme of the present invention, and detailed embodiments and processes are given, but the scope of the present invention is not limited to the following examples, and the experimental methods without specific conditions noted in the following examples are generally performed according to conventional conditions.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a system for recycling wastewater from pseudoboehmite production according to the present invention. The system for recycling the wastewater generated in the production of the pseudo-boehmite comprises a regulating reservoir 1, a suspended matter device 2, a multi-medium filter, a nanofiltration device, a reverse osmosis device, an MVR device and a crystallization device which are sequentially connected.
In some embodiments, the pH of the wastewater in the conditioning tank is 10 or less.
In some embodiments, the suspension device is a magnetic flocculation device or an electric flocculation device.
In some embodiments, a crystallization tank is also connected to the suspension apparatus.
Based on the system for recycling the wastewater from the pseudoboehmite production, the method for recycling the wastewater from the pseudoboehmite production comprises the following steps:
(1) the wastewater enters an adjusting tank 1 to adjust the pH value of the wastewater to be less than or equal to 10;
(2) the wastewater enters a suspended matter device 2 to remove suspended matters therein to obtain solid suspended matters and wastewater from which the suspended matters are removed;
(3) the wastewater from which the suspended substances are removed enters a multi-media filter 3 to remove insoluble substances therein; and (4) feeding the solid suspended substance into a crystallizing tank for aging treatment.
(4) Then the fresh water produced by the nanofiltration device 4 is used for producing clean water to be recycled to the pseudo-boehmite washing procedure, and the concentrated water produced by the nanofiltration device 4 is continuously fed into a reverse osmosis device 5 for further concentration to obtain concentrated water;
(5) fresh water generated in the concentration process of the reverse osmosis device 5 is also used for producing clean water for recycling to the pseudo-boehmite washing process, concentrated water enters the MVR device 6 for further concentration, and evaporated condensed water generated by the MVR device 6 is also used for producing clean water for recycling to the pseudo-boehmite washing process;
(6) and (5) feeding the concentrated water further concentrated in the step (5) into a crystallizing device 7, and crystallizing and separating clean sodium sulfate solid.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a system for recycling wastewater from pseudoboehmite production according to an embodiment of the present invention. Wherein the suspension device 2 is an electric flocculation device 21.
In the embodiment, when the system for recycling the wastewater from the pseudoboehmite production works, the specific steps are as follows:
the wastewater firstly enters the regulating tank 1, after the pH value of the wastewater is regulated to be less than or equal to 10, the wastewater enters the electric flocculation device 21, suspended matters in the wastewater are removed in the electric flocculation device 21, and the wastewater and solid suspended matters with the suspended matters removed are obtained. Of course the electric flocculation apparatus 21 can also be replaced by a magnetic flocculation apparatus.
Wherein the obtained suspended substance (mainly pseudoboehmite particles with a particle size of below 50 μm) is sent into a pseudoboehmite recrystallization tank (not shown) for aging treatment to increase the particle size, thereby achieving the purpose of recovering pseudoboehmite; because the invention removes the suspended solid of waste water and adopts the electric flocculation or magnetic flocculation means, does not introduce other chemical substances, therefore this part of suspended solid can be recycled directly.
Wherein, the wastewater without suspended matters enters the multi-medium filter 3 to further remove the insoluble matters, so that the wastewater after entering the nanofiltration system meets the requirement of the nanofiltration system on the content of the suspended matters in the wastewater; the wastewater after the insoluble substances are removed completely directly enters a nanofiltration device 4, and fresh water containing trace divalent salt and concentrated water containing a large amount of divalent salt (most of sodium sulfate) after primary concentration are obtained through separation.
Wherein, the fresh water is directly used for production and recycled to the pseudo-boehmite washing procedure, the mass content of sulfate radical in the fresh water is not higher than 0.5 percent, and the mass content of chloride is not higher than 1 percent. (if the content of the chloride in the fresh water is higher than 1% by mass, part of the water is discharged to the integrated sewage treatment plant)
Wherein, the concentrated water continues to enter the reverse osmosis device 5 for further concentration, the concentration of divalent salt (most of sodium sulfate) in the concentrated water is further improved, the load of a subsequent evaporation unit is reduced, and the energy consumption is reduced. The concentrated water enters an MVR device 6 for evaporation for crystallization; clean water generated by the reverse osmosis device 5 is also used for production and is recycled to the pseudo-boehmite washing procedure, and the mass content of sulfate radicals in the clean water is not higher than 0.5%.
The evaporated condensed water generated by the MVR device 6 is recycled to the pseudo-boehmite washing procedure to achieve the purpose of recycling the wastewater; and the wastewater concentrated by the MVR device 6 enters a crystallizing device 7, and clean sodium sulfate solid is separated out.
Example 1
The pseudo-boehmite production wastewater sent from a workshop is 30t/h, wherein the contents of sulfate ions, sodium ions and other substances are detailed in Table 1.
By adopting the system shown in FIG. 2, the wastewater firstly enters an adjusting tank 1, the pH value of the wastewater is adjusted to be less than or equal to 10 by adopting sulfuric acid, and then the wastewater enters an electric flocculation device 2 to remove suspended matters in the wastewater, so that the content of the suspended matters in the wastewater is less than 5 mug/L; the wastewater from which suspended substances are removed is further subjected to removal of insoluble substances by a multi-media filter 3, and the obtained suspended substances are sent to a pseudoboehmite recrystallization tank (not shown) for aging treatment to increase the particle size, thereby achieving the purpose of recovering the pseudoboehmite.
The wastewater after the insoluble substances are completely removed directly enters a nanofiltration device 4 to primarily concentrate and remove part of divalent salt, namely sulfate, the fresh water side is used for producing clean water (the mass content of the sulfate is not higher than 0.5 percent, and the mass content of the chloride is not higher than 1 percent) for about 20t/h to be recycled to the pseudo-boehmite washing procedure, and the concentrated water is about 10t/h to continuously enter a reverse osmosis device 5 to be further concentrated.
Concentrated water from the nanofiltration device 4 enters a reverse osmosis device 5 for further concentration, and the concentrated water enters an MVR device 6 for evaporation at about 5t/h for crystallization; fresh water generated by the reverse osmosis device 5 is used for producing clean water about 5t/h and is recycled to the pseudo-boehmite washing procedure; the concentrated water enters a crystallization process after being further concentrated in the MVR device 6, and clean sodium sulfate solid is separated out and is about 600 kg/h; the evaporated condensed water generated by the MVR device 6 is recycled to the pseudo-boehmite washing procedure at about 4 t/h. Thus about 29t/h of waste water is recycled.
Example 2
The pseudo-boehmite production wastewater sent from a workshop is 30t/h, wherein the contents of sulfate ions, sodium ions and other substances are detailed in Table 1.
By adopting the system shown in FIG. 2, the wastewater firstly enters an adjusting tank 1, the pH value of the wastewater is adjusted to be less than or equal to 10 by adopting sulfuric acid, and then the wastewater enters an electric flocculation device 2 to remove suspended matters in the wastewater, so that the content of the suspended matters in the wastewater is less than 5 mug/L; the wastewater from which suspended substances are removed is further subjected to removal of insoluble substances by a multi-media filter 3, and the obtained suspended substances are sent to a pseudoboehmite recrystallization tank (not shown) for aging treatment to increase the particle size, thereby achieving the purpose of recovering the pseudoboehmite.
The wastewater after the insoluble substances are completely removed directly enters a nanofiltration device 4 to primarily concentrate and remove part of divalent salt, namely sulfate, the fresh water side is used for producing clean water (the mass content of the sulfate is not higher than 0.5 percent, and the mass content of the chloride is not higher than 1 percent) for about 20t/h to be recycled to the pseudo-boehmite washing procedure, and the concentrated water is about 10t/h to continuously enter a reverse osmosis device 5 to be further concentrated.
Concentrated water from the nanofiltration device 4 enters a reverse osmosis device 5 for further concentration, and the concentrated water enters an MVR device 6 for evaporation at about 5t/h for crystallization; fresh water generated by the reverse osmosis device 5 is used for producing clean water about 5t/h and is recycled to the pseudo-boehmite washing procedure; the concentrated water enters a crystallization process after being further concentrated in the MVR device 6, and clean sodium sulfate solid is separated out at about 590 kg/h; the evaporated condensed water generated by the MVR device 6 is recycled to the pseudo-boehmite washing procedure at about 4 t/h. Thus about 29t/h of waste water is recycled.
TABLE 1
From the above examples it can be seen that:
after the system regulates the pH value of the wastewater in the regulating tank, suspended matters in the wastewater are removed to the maximum extent through the suspended matter device, and suspended matter solids are recycled; divalent ion and monovalent ion in the wastewater are separated by combining nanofiltration, divalent ion (sulfate radical) is maximally enriched and concentrated on the concentrated water side, and more than 99% of sulfate radical is recovered; then, sodium sulfate in the pseudo-boehmite waste water is crystallized and evaporated by an existing MVR evaporation crystallization device, high-purity sodium sulfate is generated for sale during recovery, condensed water of evaporation crystallization and nanofiltration produced water are mixed and then directly reused in the production process, so that the water resource recycling of the pseudo-boehmite washing process is realized to the greatest extent, and the purpose of waste water recycling is achieved.
The suspended matter device of the invention adopts the magnetic flocculation device or the electric flocculation device to remove the suspended matters in the wastewater to the maximum extent, and other chemical substances are not introduced in the suspended matter removing process, so that valuable solid suspended matters can be recycled.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that all such changes and modifications as fall within the true spirit and scope of the invention be considered as within the following claims.
Claims (10)
1. A system for recycling wastewater generated in the production of pseudo-boehmite is characterized by comprising a regulating reservoir, a suspended matter device, a multi-media filter, a nanofiltration device, a reverse osmosis device, an MVR device and a crystallization device which are sequentially connected.
2. The system for recycling wastewater generated in pseudoboehmite production according to claim 1, characterized in that the pH value of the wastewater in the adjusting tank is less than or equal to 10.
3. The system for recycling wastewater generated in pseudoboehmite production according to claim 1, characterized in that the suspension device is a magnetic flocculation device or an electric flocculation device.
4. The system for recycling wastewater generated in pseudoboehmite production according to claim 1, characterized in that a crystallizing tank is further connected to the suspension device.
5. The system for recycling pseudoboehmite production wastewater according to claim 1, characterized in that the wastewater contains pseudoboehmite suspended particles, sulfate and chloride, 98 wt% of solute in the wastewater is sodium sulfate, and the concentration of the wastewater is 20000mg/L or more.
6. A method for recycling wastewater generated in pseudoboehmite production is characterized by comprising the following steps:
(1) the wastewater enters an adjusting tank to adjust the pH value of the wastewater;
(2) the wastewater enters a suspended matter device to remove suspended matters in the wastewater to obtain solid suspended matters and wastewater from which the suspended matters are removed;
(3) the wastewater from which the suspended substances are removed enters a multi-media filter to remove insoluble substances in the wastewater;
(4) then the fresh water produced by the nanofiltration device is used for producing clean water to be recycled to the pseudo-boehmite washing procedure, and the concentrated water produced by the nanofiltration device is continuously fed into a reverse osmosis device for further concentration to obtain concentrated water;
(5) fresh water generated in the concentration process of the reverse osmosis device is also used for producing clean water for recycling to the pseudo-boehmite washing process, concentrated water enters the MVR device for further concentration, and evaporated condensed water generated by the MVR device is also used for producing clean water for recycling to the pseudo-boehmite washing process;
(6) and (5) feeding the concentrated water subjected to further concentration in the step (5) into a crystallization device, and crystallizing and separating out a sodium sulfate solid.
7. The method for recycling wastewater from pseudoboehmite production according to claim 6, characterized in that in step (1), the pH of the wastewater is adjusted to 10 or less.
8. The method for recycling wastewater generated in pseudoboehmite production according to claim 6, characterized in that the suspension device is a magnetic flocculation device or an electric flocculation device.
9. The method for recycling wastewater generated in pseudoboehmite production according to claim 6, characterized in that in the step (2), the solid suspension enters a crystallizing tank for aging treatment.
10. The method for recycling pseudo-boehmite production wastewater according to claim 6, characterized in that the sulfate radical mass content in the clean water is not higher than 0.5%, and the chloride mass content is not higher than 1%.
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