CN114506959A - Method for recycling acid wastewater after cleaning of aluminum profile anodic oxidation tank - Google Patents
Method for recycling acid wastewater after cleaning of aluminum profile anodic oxidation tank Download PDFInfo
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- 239000002253 acid Substances 0.000 title claims abstract description 170
- 230000003647 oxidation Effects 0.000 title claims abstract description 39
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 39
- 239000002351 wastewater Substances 0.000 title claims abstract description 35
- 238000004064 recycling Methods 0.000 title claims abstract description 34
- 238000004140 cleaning Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 147
- 239000012528 membrane Substances 0.000 claims description 64
- 238000001704 evaporation Methods 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 15
- 230000008020 evaporation Effects 0.000 claims description 14
- 230000002378 acidificating effect Effects 0.000 claims description 13
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- -1 aluminum ions Chemical class 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 238000011112 process operation Methods 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 50
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000008399 tap water Substances 0.000 description 7
- 235000020679 tap water Nutrition 0.000 description 7
- 230000003203 everyday effect Effects 0.000 description 5
- 239000012466 permeate Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011085 pressure filtration Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002699 waste material 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
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/16—Regeneration of process solutions
- C25D21/20—Regeneration of process solutions of rinse-solutions
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention provides a method for recycling acid wastewater after cleaning an aluminum profile anodic oxidation tank, and belongs to the technical field of acid wastewater treatment. The method for recycling the acid wastewater after cleaning the aluminum profile anodic oxidation tank can recycle acid, water and aluminum ions in the acid wastewater, has simple process operation, high recycling efficiency and good economic benefit, meets the requirement of green and environment-friendly production, and can effectively solve the problems of high pollution, high energy consumption, large acid and alkali consumption and high salinity of wastewater discharged in the aluminum profile anodic oxidation surface treatment and processing link.
Description
Technical Field
The invention relates to the technical field of acid wastewater treatment, in particular to a method for recycling acid wastewater after cleaning an aluminum profile anodic oxidation tank.
Background
The aluminum profile as a novel environment-friendly material plays an important role in the national economic development process, and the usage amount is higher and higher in recent years.
The existing aluminum profile anodic oxidation surface treatment processing link generally has the problems of high pollution, high energy consumption, large acid and alkali consumption, serious excessive use and high salinity of wastewater pollution discharge. In the past, the environment ecology is irreversibly damaged. The link with the largest acid consumption of the anodic oxidation line is that the sulfuric acid carried by a workpiece after the workpiece is discharged from an oxidation tank enters subsequent cleaning water, the sulfuric acid consumed in the process is close to 60% of the consumption of the sulfuric acid replenished by the anodic oxidation tank every day, the acidic wastewater is completely treated by terminal neutralization reaction in the anodic oxidation industry, a large amount of sodium hydroxide is consumed to neutralize waste acid, the salt content of the wastewater is very high, the main salt is sodium sulfate, the sodium sulfate can not be reused, and the acidic wastewater is finally discharged into a natural water body to cause irreversible damage to soil and water environment. Meanwhile, the process consumes a large amount of tap water, and long-term influence is also generated on stable water supply of cities.
Disclosure of Invention
In view of the above, the present invention provides a method for recycling acidic wastewater after cleaning an aluminum profile anodic oxidation tank. The method for recycling the acid wastewater after cleaning the aluminum profile anodic oxidation tank can recycle acid, water and aluminum ions in the acid wastewater.
The technical scheme provided by the invention is as follows: a method for recycling acid wastewater after cleaning an aluminum profile anodic oxidation tank comprises the following steps:
(1) collecting the acid cleaning wastewater after being cleaned by the anodic oxidation tank through a collecting tank;
(2) filtering the collected acidic cleaning wastewater through a pretreatment membrane to obtain filtered water;
(3) passing the filtered water through a first-stage acid-resistant membrane element to obtain concentrated acid water and produced water containing low-concentration acid;
(4) the water produced in the step (3) containing low-concentration acid is efficiently separated through a three-stage acid-resistant membrane element to obtain separated water and separated concentrated acid water, wherein the separated water is directly returned to a reuse water tank after the pH of the separated water is adjusted, and the separated concentrated acid water is returned to the first-stage acid-resistant membrane element in the step (3) for recycling;
(5) the concentrated acid water obtained in the step (3) is subjected to secondary acid-resistant membrane element to obtain high-efficiency concentrated acid water and water containing low-concentration acid, the high-efficiency concentrated acid water enters a low-temperature concentration system to be evaporated, the concentrated acid water obtained by evaporation is cooled and then separated to separate aluminum sulfate crystals, and the concentrated acid water is recovered in an acid temporary storage tank and can be directly used in an anodic oxidation tank; after adjusting the pH value of the condensed water generated by evaporation, returning the condensed water to the reuse water tank in the step (4) for continuously cleaning the workpiece;
and (4) returning the produced water containing the low-concentration acid to the first-stage acid-resistant membrane element in the step (3) for recycling.
Preferably, the pretreatment membrane is an acid-resistant ceramic membrane module, and the cutoff pore diameter is 0.05 μm.
Preferably, the concentration of the concentrated acid water in the step (3) is 20-30 g/L.
Preferably, the acid concentration in the water produced in the step (3) containing low-concentration acid is lower than 2 g/L.
Preferably, the concentration of acid in the produced water after separation in the step (4) is lower than 0.1g/L, and the pH value is 4-5.
Preferably, the concentration of the concentrated acid water in the step (5) is 80-100 g/L.
Preferably, the concentration of acid in the water produced in the step (5) containing a low concentration of acid is less than 10 g/L.
Preferably, the pH after the adjustment in the step (4) and the step (5) is independently 6-8.
Preferably, the evaporation temperature of the step (5) is 37-50 ℃.
Preferably, the separation of step (5) comprises centrifugal separation or pressure filtration separation.
The invention has the beneficial technical effects that:
1. more than 95% of acid carried away by the workpiece from the anodic oxidation tank is recycled and reused in the anodic oxidation tank;
2. the consumption of sodium hydroxide required by acid-base neutralization reaction in the sewage treatment process is saved by more than 95 percent;
3. workpiece cleaning water is recycled on line with the total consumption of 95%, so that the consumption of tap water is greatly reduced;
4. the aluminum ions are changed into aluminum sulfate crystals which are used as a sewage treatment flocculating agent to reduce the production of aluminum-containing sludge;
5. greatly reducing the sewage treatment operating environment and labor intensity;
6. the whole process of the process control process is automatically controlled, and unattended operation is realized through data exchange;
drawings
FIG. 1 is a process flow diagram for recycling acidic wastewater after cleaning an aluminum profile anodic oxidation tank.
Detailed Description
The invention provides a method for recycling acid wastewater after cleaning an aluminum profile anodic oxidation tank, which comprises the following steps:
(1) collecting the acid cleaning wastewater after being cleaned by the anodic oxidation tank through a collecting tank;
(2) filtering the collected acidic cleaning wastewater through a pretreatment membrane to obtain filtered water;
(3) passing the filtered water through a first-stage acid-resistant membrane element to obtain concentrated acid water and produced water containing low-concentration acid;
(4) the water produced in the step (3) containing low-concentration acid is efficiently separated through a three-stage acid-resistant membrane element to obtain separated water and separated concentrated acid water, wherein the separated water is directly returned to a reuse water tank after the pH of the separated water is adjusted, and the separated concentrated acid water is returned to the first-stage acid-resistant membrane element in the step (3) for recycling;
(5) the concentrated acid water obtained in the step (3) is subjected to secondary acid-resistant membrane element to obtain high-efficiency concentrated acid water and water containing low-concentration acid, the high-efficiency concentrated acid water enters a low-temperature concentration system to be evaporated, the concentrated acid water obtained by evaporation is cooled and then separated to separate aluminum sulfate crystals, and the concentrated acid water is recovered in an acid temporary storage tank and can be directly used in an anodic oxidation tank; after adjusting the pH value of the condensed water generated by evaporation, returning the condensed water to the reuse water tank in the step (4) for continuously cleaning the workpiece;
and (4) returning the produced water containing the low-concentration acid to the first-stage acid-resistant membrane element in the step (3) for recycling.
The invention collects the acid cleaning wastewater after the cleaning of the anodic oxidation tank through the collecting tank.
In the invention, the acidic cleaning wastewater comes from a rear end washing tank of an anodic oxidation tank, the main components of the anodic oxidation tank are sulfuric acid and aluminum ions, the concentration of the sulfuric acid is 160-250 g/L, the concentration of the aluminum ions is 10-18 g/L, a large amount of acid can be carried on the surface and in a groove of a workpiece in the process of discharging the workpiece out of the tank, the workpiece enters a rear washing tank of the anodic oxidation tank, the acid on the surface and in the groove of the workpiece can be cleaned through a large amount of tap water, and then the workpiece can enter the next link of the production process, so that a large amount of sulfuric acid can be consumed in the process, and a large amount of tap water can be consumed at the same time. The main components of the acidic wastewater are low-concentration sulfuric acid and aluminum ions, the concentration of the sulfuric acid is 5-20 g/L, and the concentration of the aluminum ions is about 0.2-1.5 g/L.
After the acidic cleaning wastewater in the collecting tank is obtained, the collected acidic cleaning wastewater is filtered by a pretreatment membrane to obtain filtered water.
In the present invention, the pretreatment membrane is preferably an acid-resistant ceramic membrane module preferably selected from the group consisting of Jiangsu Jiugu high-tech Co., Ltd, a tolerant sulfuric acid concentration by mass of preferably < 25%, a sulfuric acid rejection rate of preferably all passing through, and a rejection pore size of preferably 0.05 μm.
The invention adopts the acid-resistant ceramic membrane component, can remove trace ash and suspended matters with the apparent characteristics of particle size of more than 0.05 micron in the wastewater, and the acid-resistant ceramic membrane component needs to be regularly washed to ensure the stable flux of the membrane, and the whole washing process is fully automatically controlled.
After filtered water is obtained, the filtered water passes through a first-stage acid-resistant membrane element to obtain concentrated acid water and produced water containing low-concentration acid.
In the invention, the primary acid-proof membrane element is preferably a primary acid-proof pressure membrane element, the concentration of the concentrated acid water is preferably 20-30 g/L, and the concentration of the acid in the produced water containing low-concentration acid is preferably lower than 2 g/L.
In the invention, the high-efficiency interception of acid can be realized through the primary acid-resistant pressure membrane element, after the separation of the primary acid-resistant pressure membrane element, more than 90% of sulfuric acid can not permeate the primary acid-resistant pressure membrane element membrane, and aluminum ions can not permeate the membrane and are also remained on the concentrated acid side.
After obtaining the concentrated acid water and the produced water containing the low-concentration acid, the invention realizes the high-efficiency separation of the water of the produced water containing the low-concentration acid in the step (3) through a three-stage acid-resistant membrane element to obtain the separated produced water and the separated concentrated acid water, wherein the separated produced water is directly returned to a reuse water tank after the pH value is adjusted, and the separated concentrated acid water is returned to the first-stage acid-resistant membrane element in the step (3) for recycling.
In the invention, the concentration of acid in the separated produced water is preferably lower than 0.1g/L, the pH is preferably 4-5, and the pH after adjustment is preferably 6-8.
In the invention, the high-efficiency separation of water is realized by the three-stage acid-resistant pressure membrane element. The quality of the separated produced water is improved by more than 50% compared with tap water, is close to the quality of pure water, and is directly returned to the reuse water tank for continuously cleaning workpieces, more than 90% of concentrated acid water can not penetrate through the three-stage acid-resistant pressure membrane element to form concentrated acid water, and the concentrated acid water is returned to the one-stage acid-resistant pressure membrane element for recycling.
The concentrated acid water in the step (3) is subjected to secondary acid-resistant membrane element to obtain high-efficiency concentrated acid water and water containing low-concentration acid, the high-efficiency concentrated acid water enters a low-temperature concentration system for evaporation, the concentrated acid water obtained by evaporation is cooled and then separated to separate aluminum sulfate crystals, and the concentrated acid water is recovered in an acid temporary storage tank and can be directly used in an anodic oxidation tank; after adjusting the pH value of the condensed water generated by evaporation, returning the condensed water to the reuse water tank in the step (4) for continuously cleaning the workpiece; and (4) returning the produced water containing the low-concentration acid to the first-stage acid-resistant membrane element in the step (3) for recycling.
In the invention, the concentration of the high-efficiency concentrated acid water is preferably 80-100 g/L;
the concentration of acid in the water containing low concentration of acid is preferably less than 10 g/L;
the pH value after adjustment is preferably 6-8;
the evaporation temperature of the step is preferably 37-50 ℃;
the separation preferably comprises centrifugal separation or pressure filtration separation.
In the invention, the high-efficiency concentration of acid is realized by the secondary acid-resistant pressure membrane element. The concentrated acid water after being separated again by the second-stage acid-proof pressure membrane element has over 90 percent of acid which can not permeate the membrane, and simultaneously, aluminum ions can not permeate the second-stage acid-proof pressure membrane element and remain on the concentrated acid side.
In the invention, the low-temperature concentration system is used for realizing high-power concentration and recycling of acid. Evaporating water from the concentrated acid water through a low-temperature concentration system to further improve the concentration of sulfuric acid, and directly returning the concentrated acid water to the anodic oxidation tank for use as long as the concentration of the sulfuric acid exceeds 20%; the concentration of the sulfuric acid can also be improved to 90%, supersaturated aluminum ions are precipitated in the form of aluminum sulfate crystals after the sulfuric acid is cooled, the aluminum sulfate crystals are separated out through filter pressing or centrifugation and used as a sewage treatment flocculating agent, the sulfuric acid after solid-liquid separation is used in an anodic oxidation tank, the sulfuric acid basically cannot volatilize during low-temperature evaporation, the pH of the generated condensed water is 5-6, and the condensed water is directly reused in a water washing tank to continuously wash workpieces after the pH is finely adjusted to 6-8.
In the invention, the primary acid-proof membrane element, the secondary acid-proof membrane element and the tertiary acid-proof membrane element are preferably selected from Suez group of France, the type of the primary acid-proof membrane element, the type of the secondary acid-proof membrane element and the type of the tertiary acid-proof membrane element are preferably InDUSTRIAL R058040F35, the mass concentration of the tolerant sulfuric acid is preferably less than 25%, the sulfuric acid retention rate is preferably 90-95%, the retention pore diameter is preferably 0.0001 mu m, the pressure-resistant range of the primary acid-proof membrane element is preferably 2-4 mpa, the pressure-resistant range of the secondary acid-proof membrane element is preferably 5-8 mpa, and the pressure-resistant range of the tertiary acid-proof membrane element is preferably 1.5-2.5 mpa.
In order to further illustrate the present invention, the following will describe in detail the recycling method of acidic wastewater after cleaning of the anodic oxidation tank for aluminum profiles according to the present invention with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Taking a certain aluminum material oxidation enterprise as an example:
150 tons of anodic aluminum oxide profiles are used every day, 7 tons of 98% industrial sulfuric acid are used every day in an anodic oxidation tank, 300 tons of tap water are used in a rinsing tank after the oxidation tank every day, the concentration of sulfuric acid discharged by the rinsing tank is 15g/L, and the concentration of aluminum ions is 1.1 g/L.
The acid wastewater after the aluminum profile anodic oxidation tank is cleaned is treated by the following process method (figure 1 is a process flow chart):
(1) collecting the acid cleaning wastewater after being cleaned by the anodic oxidation tank through a collecting tank;
(2) filtering the collected acidic cleaning wastewater by a pretreatment membrane, wherein the pretreatment membrane is an acid-resistant ceramic membrane component, the interception pore diameter is 0.05 mu m, and removing trace ash and suspended matters with the apparent characteristics of particle sizes of more than 0.05 mu m in the wastewater to obtain filtered water;
(3) passing the filtered water through a first-stage acid-resistant membrane element to obtain concentrated acid water and produced water containing low-concentration acid; the concentration of the concentrated acid water in the step (3) is 25 g/L; the acid concentration in the produced water containing low-concentration acid in the step (3) is 1.5 g/L;
(4) carrying out efficient separation on the water containing the low-concentration acid in the step (3) through a three-stage acid-resistant membrane element to obtain separated water (0.1g/L) and separated concentrated acid water, wherein the separated water is directly returned to a reuse water tank after the pH value of the separated water is adjusted to 7, and the separated concentrated acid water is returned to the first-stage acid-resistant membrane element in the step (3) for recycling;
(5) the concentrated acid water in the step (3) is subjected to secondary acid-resistant membrane element to obtain high-efficiency concentrated acid water (90g/L) and water containing low-concentration acid (the concentration of the acid is lower than 10g/L), the high-efficiency concentrated acid water enters a low-temperature concentration system to be evaporated at 40 ℃, the evaporated concentrated acid water is cooled and then separated to separate aluminum sulfate crystals, and the concentrated acid water is recovered in an acid temporary storage tank and can be directly used in an anodic oxidation tank; after the pH value of the condensed water generated by evaporation is adjusted to 7, returning the condensed water to the reuse water tank in the step (4) for continuously cleaning the workpiece;
and (4) returning the produced water containing the low-concentration acid to the first-stage acid-resistant membrane element in the step (3) for recycling.
After the treatment, 4 tons of 98 percent industrial sulfuric acid, 290 tons of tap water and 3.25 tons of sodium hydroxide are saved every day. The conductivity of the reuse water is 100-400 us/cm, the pH of the reuse water is 7, the mass concentration of the recovered sulfuric acid is 60%, the recovered sulfuric acid is equivalent to about 4 tons of 98% industrial sulfuric acid, and the crystalline aluminum sulfate is about 200 KG.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. A method for recycling acid wastewater after cleaning an aluminum profile anodic oxidation tank is characterized by comprising the following steps:
(1) collecting the acid cleaning wastewater after being cleaned by the anodic oxidation tank through a collecting tank;
(2) filtering the collected acidic cleaning wastewater through a pretreatment membrane to obtain filtered water;
(3) passing the filtered water through a first-stage acid-resistant membrane element to obtain concentrated acid water and produced water containing low-concentration acid;
(4) the water produced in the step (3) containing low-concentration acid is efficiently separated through a three-stage acid-resistant membrane element to obtain separated water and separated concentrated acid water, wherein the separated water is directly returned to a reuse water tank after the pH of the separated water is adjusted, and the separated concentrated acid water is returned to the first-stage acid-resistant membrane element in the step (3) for recycling;
(5) the concentrated acid water obtained in the step (3) is subjected to secondary acid-resistant membrane element to obtain high-efficiency concentrated acid water and water containing low-concentration acid, the high-efficiency concentrated acid water enters a low-temperature concentration system to be evaporated, the concentrated acid water obtained by evaporation is cooled and then separated to separate aluminum sulfate crystals, and the concentrated acid water is recovered in an acid temporary storage tank and can be directly used in an anodic oxidation tank; after adjusting the pH value of the condensed water generated by evaporation, returning the condensed water to the reuse water tank in the step (4) for continuously cleaning the workpiece;
and (4) returning the produced water containing the low-concentration acid to the first-stage acid-resistant membrane element in the step (3) for recycling.
2. The recycling method according to claim 1, wherein the pretreatment membrane is an acid-resistant ceramic membrane module having a cutoff pore size of 0.05 μm.
3. The recycling method according to claim 1, wherein the concentration of the concentrated acid water in the step (3) is 20-30 g/L.
4. The recycling method according to claim 1, wherein the acid concentration in the produced water containing low concentration of acid in the step (3) is less than 2 g/L.
5. The recycling method of claim 1, wherein the concentration of the acid in the produced water separated in the step (4) is lower than 0.1g/L, and the pH value is 4-5.
6. The recycling method according to claim 1, wherein the concentration of the concentrated acid water in step (5) is 80-100 g/L.
7. The recycling method according to claim 1, wherein the concentration of acid in the produced water containing low concentration of acid in the step (5) is less than 10 g/L.
8. The recycling method according to claim 1, wherein the adjusted pH values in the steps (4) and (5) are independently 6-8.
9. The recycling method according to claim 1, wherein the evaporation temperature in the step (5) is 37-50 ℃.
10. The recycling method according to claim 1, wherein the separation of step (5) comprises centrifugal separation or filter-press separation.
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| CN202210194468.3A CN114506959A (en) | 2022-03-01 | 2022-03-01 | Method for recycling acid wastewater after cleaning of aluminum profile anodic oxidation tank |
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| CN202210194468.3A Withdrawn CN114506959A (en) | 2022-03-01 | 2022-03-01 | Method for recycling acid wastewater after cleaning of aluminum profile anodic oxidation tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114959824A (en) * | 2022-05-24 | 2022-08-30 | 日铭电脑配件(上海)有限公司 | On-line treatment and regeneration method of anodic oxidation liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959824A (en) * | 2022-05-24 | 2022-08-30 | 日铭电脑配件(上海)有限公司 | On-line treatment and regeneration method of anodic oxidation liquid |
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