CN219136566U - Electroplating wastewater treatment system - Google Patents
Electroplating wastewater treatment system Download PDFInfo
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- CN219136566U CN219136566U CN202221258037.0U CN202221258037U CN219136566U CN 219136566 U CN219136566 U CN 219136566U CN 202221258037 U CN202221258037 U CN 202221258037U CN 219136566 U CN219136566 U CN 219136566U
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- 238000009713 electroplating Methods 0.000 title claims abstract description 39
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 263
- 239000002351 wastewater Substances 0.000 claims abstract description 78
- 238000001914 filtration Methods 0.000 claims abstract description 41
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 35
- 230000003647 oxidation Effects 0.000 claims abstract description 33
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 29
- 238000004064 recycling Methods 0.000 claims abstract description 23
- 238000006479 redox reaction Methods 0.000 claims abstract description 8
- 239000000084 colloidal system Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000001704 evaporation Methods 0.000 claims description 32
- 230000008020 evaporation Effects 0.000 claims description 31
- 239000008213 purified water Substances 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000000108 ultra-filtration Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 11
- 238000007747 plating Methods 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 20
- 238000000746 purification Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 19
- 150000003839 salts Chemical class 0.000 abstract description 15
- 239000000701 coagulant Substances 0.000 abstract description 6
- 230000001112 coagulating effect Effects 0.000 abstract description 5
- 238000004062 sedimentation Methods 0.000 abstract description 5
- 239000002253 acid Substances 0.000 abstract description 4
- 239000012528 membrane Substances 0.000 description 30
- 230000002378 acidificating effect Effects 0.000 description 10
- 238000011084 recovery Methods 0.000 description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 8
- 238000001223 reverse osmosis Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 4
- -1 hydroxyl ions Chemical class 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 238000005374 membrane filtration Methods 0.000 description 2
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The utility model discloses an electroplating wastewater treatment system, which comprises the following components in series connection: the waste water collecting tank is used for collecting waste water generated by electroplating; the pretreatment unit comprises an oxidation device and a filtering device which are sequentially connected in series, electroplating wastewater in the wastewater collection tank enters the oxidation device to undergo oxidation-reduction reaction so as to change macromolecular organic matters in the wastewater into micromolecular organic matters, and the wastewater treated by the oxidation device enters the filtering device to remove impurities and colloid in the wastewater; the recycling treatment unit comprises a primary RO device, a secondary RO device and a concentrated water treatment module, and the wastewater passes through the recycling treatment unit to further remove organic matters, salts and the like in the wastewater; the utility model adopts the micro-electrolysis technology to replace the traditional coagulating sedimentation, so that the addition of acid and coagulant can be reduced; the micro-electrolysis process is not influenced by the ambient temperature, salt and the like, and has stable operation and simple operation.
Description
Technical Field
The utility model relates to the technical field of sewage treatment systems, in particular to an electroplating wastewater treatment system.
Background
The electroplating wastewater has the characteristics of large production amount, heavy pollution, complex treatment process, high treatment cost, multiple secondary pollution and the like, so that the treatment and recycling of the electroplating wastewater are very important, the pretreatment of the electroplating wastewater is realized through the combination of various processes, the pretreated electroplating wastewater is filtered and concentrated in high power, the water quantity of concentrated water required to be treated in a wastewater zero-emission system is reduced, the system investment is reduced, and the system operation cost is reduced.
Because the electroplating wastewater has complex components, high concentration of organic matters, poor biodegradability and high salt content, the treatment and recycling process of the electroplating wastewater in the prior art mostly adopts coagulating sedimentation to remove metal ions, the biochemical process removes organic matters, and most of organic matters and heavy metals in the wastewater are removed after the pretreatment, but the pretreatment cannot remove the salt content in the wastewater and cannot completely remove the organic matters in the wastewater, so the pretreated wastewater enters a recycling treatment unit to completely remove the salt content and the organic matters in the wastewater, thereby reaching the standard of recycling production, and the treatment and recycling process of the electroplating wastewater in the prior art mostly adopts RO membrane filtration process and evaporation process to remove the salt content and the organic matters; however, the electroplating wastewater treatment process in the prior art has the following disadvantages: firstly, a large amount of agents (acid, alkali, coagulant, flocculant, recapture agent and the like) are required to be added in the coagulating sedimentation, so that a large amount of sludge is generated; secondly, the electroplating wastewater has poor biodegradability, the temperature, the pH, the salt content and the like have great influence on the anaerobic and aerobic biological treatment process, the operation is easy to be unstable, the removal rate of organic matters is low, and the occupied area is large; meanwhile, in the existing RO membrane filtration process, the production amount of concentrated water is large, the amount of concentrated water to be treated by an evaporation device is large, the energy consumption required for evaporating the concentrated water is high, and the evaporation operation cost is high.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide the electroplating wastewater treatment system with low cost investment, low energy consumption and high recovery rate.
In order to solve the technical problems, the utility model provides an electroplating wastewater treatment system, which comprises the following components in series connection:
the waste water collecting tank is used for collecting waste water generated by electroplating;
the pretreatment unit comprises an oxidation device and a filtering device which are sequentially connected in series, electroplating wastewater in the wastewater collection tank enters the oxidation device to undergo oxidation-reduction reaction so as to change macromolecular organic matters in the wastewater into micromolecular organic matters, and the wastewater treated by the oxidation device enters the filtering device to remove impurities and colloid in the wastewater;
the recycling treatment unit comprises a first-stage RO device, a second-stage RO device and a concentrated water treatment module, wherein the wastewater treated by the pretreatment unit sequentially enters the first-stage RO device and the second-stage RO device, the concentrated water generated by the first-stage RO device and the second-stage RO device both enter the concentrated water treatment module, and the concentrated water generated by the concentrated water treatment module enters the evaporation device;
the reuse water tank is used for collecting purified water treated by the secondary RO device, purified water treated by the concentrated water treatment module and condensed water treated by the evaporation device, and water collected in the reuse water tank meets the standard of reuse production.
As a further improvement of the utility model, the oxidation device comprises a micro-electrolysis cell and an oxidation cell which are sequentially connected in series, wherein the water inlet of the micro-electrolysis cell is connected with the water outlet of the wastewater collection cell, the water outlet of the micro-electrolysis cell is connected with the water inlet of the oxidation cell, and the water outlet of the oxidation cell is connected with the water inlet of the filtering device.
As a further improvement of the utility model, the filtering device comprises a sand filter, a carbon filter and an ultrafiltration device which are sequentially connected in series, wherein the water inlet of the sand filter is connected with the water outlet of the oxidation pond, the water outlet of the sand filter is connected with the water inlet of the carbon filter, the water outlet of the carbon filter is connected with the water inlet of the ultrafiltration device, and the water outlet of the ultrafiltration device is connected with the water inlet of the primary RO device.
As a further improvement of the utility model, the purified water outlet of the primary RO device is communicated with the water inlet of the secondary RO device, the concentrated water outlet of the secondary RO device is communicated with the water inlet of the primary RO device, and the purified water outlet of the secondary RO device is communicated with the water inlet of the reuse water tank.
As a further improvement of the utility model, the concentrated water outlet of the primary RO device is communicated with the water inlet of the concentrated water treatment module, the purified water outlet of the concentrated water treatment module is communicated with the water inlet of the secondary RO device, and the concentrated water outlet of the concentrated water treatment module is communicated with the water inlet of the evaporation device.
As a further improvement of the utility model, the concentrated water treatment module comprises a concentrated water RO device, wherein the water inlet of the concentrated water RO device is communicated with the concentrated water outlet of the primary RO device, the concentrated water outlet of the concentrated water RO device is communicated with the water inlet of the evaporation device, and the purified water outlet of the concentrated water RO device is communicated with the water inlet of the secondary RO device.
As a further improvement of the utility model, the concentrated water treatment module further comprises a concentrated water RO device, wherein the water inlet of the concentrated water RO device is communicated with the concentrated water outlet of the concentrated water RO device, the concentrated water outlet of the concentrated water RO device is communicated with the water inlet of the evaporation device, and the purified water outlet of the concentrated water RO device is communicated with the water inlet of the secondary RO device.
As a further improvement of the utility model, the concentrated water treatment module further comprises an ultrahigh pressure RO device, wherein the water inlet of the ultrahigh pressure RO device is communicated with the concentrated water outlet of the concentrated water RO device, the concentrated water outlet of the ultrahigh pressure RO device is communicated with the water inlet of the evaporation device, and the purified water outlet of the ultrahigh pressure RO device is communicated with the water inlet of the secondary RO device.
As a further improvement of the utility model, the filtration pressure of the primary RO device is 1.5MPa-3.0MPa, the filtration pressure of the secondary RO device is 1.5MPa-1.8MPa, the filtration pressure of the concentrated water RO device is 2.5MPa-4.0MPa, the filtration pressure of the concentrated water RO device is 3.5MPa-5.0MPa, and the filtration pressure of the ultrahigh pressure RO device is more than 7.5MPa.
As a further improvement of the present utility model, the condensed water outlet of the evaporation device is communicated with the water inlet of the secondary RO device.
The utility model has the beneficial effects that:
the utility model is a electroplating wastewater treatment system, firstly, the utility model adopts a micro-electrolytic cell to replace the traditional coagulating sedimentation structure, because the electroplating wastewater is mainly acidic, the iron-carbon filler in the micro-electrolytic cell generates micro-electrolytic reaction under the condition of acidic wastewater to generate ferrous ions (which can be used as a coagulant), and meanwhile, the pH value of the wastewater can be increased, thus the addition of acid and coagulant can be reduced; secondly, the micro-electrolysis cell can generate oxidation reaction during reaction, can oxidatively decompose organic matters in water, reduce the concentration of the organic matters, can replace the traditional biological treatment process, and meanwhile, the micro-electrolysis process is not influenced by the environmental temperature, salt and the like, has stable operation, is simple to operate and can be operated automatically; furthermore, the utility model adopts the recycling treatment unit to replace the traditional DTRO membrane treatment system, so that the concentrated water quantity required to be evaporated is reduced, the manufacturing cost of the concentrated water treatment equipment is reduced, and the running cost of the concentrated water treatment equipment is reduced under the condition of reaching the same water quality of the effluent; meanwhile, the adopted roll-type packaging RO membrane is an anti-pollution high-pressure membrane of Heidenery company, the concentrated water generated by the primary RO is filtered and concentrated, and finally the concentrated water only accounts for less than 3% of the total water treatment amount, so that the water quantity required to be treated by the evaporation treatment process is greatly reduced, and the running cost and the energy consumption of the whole system are reduced.
Drawings
FIG. 1 is a schematic diagram of a system connection of the present utility model;
the reference numerals in the figures illustrate: 11. a wastewater collection tank; 12. a micro-electrolysis cell; 13. an oxidation pond; 14. a sand filter; 15. a carbon filter; 16. an ultrafiltration device; 17. a primary RO device; 18. a second-stage RO device; 19. a dense water RO device; 20. a dense water RO device; 21. an ultra-high pressure RO device; 22. an evaporation device; 23. and (5) recycling the water tank.
Detailed Description
The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.
Referring to FIG. 1, an embodiment of a plating wastewater treatment system according to the present utility model;
an electroplating wastewater treatment system, comprising:
a wastewater collection tank 11, wherein the wastewater collection tank 11 is used for collecting wastewater generated by electroplating;
the pretreatment unit comprises an oxidation device and a filtering device which are sequentially connected in series, wherein electroplating wastewater in the wastewater collection tank 11 enters the oxidation device to undergo oxidation-reduction reaction so as to change macromolecular organic matters in the wastewater into micromolecular organic matters, and the wastewater treated by the oxidation device enters the filtering device to remove impurities and colloid in the wastewater;
the recycling treatment unit comprises a primary RO device 17, a secondary RO device 18 and a concentrated water treatment module, wherein the wastewater treated by the pretreatment unit sequentially enters the primary RO device 17 and the secondary RO device 18, the concentrated water generated by the primary RO device 17 and the secondary RO device 18 both enter the concentrated water treatment module, and the concentrated water generated by the concentrated water treatment module enters the evaporation device 22; the solution in the evaporation device 22 is heated to a set temperature by electricity or steam, the solution is continuously circulated in an evaporation chamber of the equipment through a circulating pump, the water in the wastewater is evaporated to separate the solution from pollutants, the organic matters and the salt form solids, and the water steam is condensed into purified water for recycling.
The reuse water tank 23, the reuse water tank 23 is used for collecting the purified water treated by the secondary RO device 18, the purified water treated by the concentrated water treatment module and the condensed water treated by the evaporation device 22, and the water collected in the reuse water tank 23 meets the standard of reuse production.
In a specific embodiment of the present utility model, the oxidation device comprises a micro-electrolysis cell 12 and an oxidation cell 13 which are sequentially connected in series, wherein the water inlet of the micro-electrolysis cell 12 is connected with the water outlet of the wastewater collection cell 11, the water outlet of the micro-electrolysis cell 12 is connected with the water inlet of the oxidation cell 13, and the water outlet of the oxidation cell 13 is connected with the water inlet of the filtering device.
The micro-electrolysis cell 12 is provided with an aeration mixing device, the wastewater enters the micro-electrolysis cell 12 filled with micro-electrolysis filler under an acidic condition, the micro-electrolysis filler can undergo oxidation-reduction reaction under the acidic condition to generate free radicals with strong oxidability, so that macromolecular organic matters in the wastewater are broken into micromolecular organic matters, COD (chemical oxygen demand) can be removed efficiently, chromaticity is reduced, and biodegradability is improved;
the wastewater enters an oxidation tank 13 after undergoing the redox reaction of a micro-electrolysis tank 12, hydrogen peroxide is added into the oxidation tank 13 for reaction, ferrous sulfate generated by the micro-electrolysis reaction and the added hydrogen peroxide react under the condition of acidic pH to generate hydroxyl ions with extremely strong oxidability, and the hydroxyl ions can break the chemical chain of organic matters in the water, so that most organic matters are changed into micromolecular organic matters, and the organic matter content of the wastewater is reduced.
The utility model adopts the micro-electrolytic cell 12 to replace the traditional coagulating sedimentation structure, because the electroplating wastewater is mainly acidic, the iron carbon filler in the micro-electrolytic cell 12 undergoes micro-electrolytic reaction under the condition of acidic wastewater to generate ferrous ions (which can be used as a coagulant), and meanwhile, the pH value of the wastewater can be increased, so that the addition of acid and coagulant can be reduced; secondly, the micro-electrolysis cell 12 can generate oxidation reaction during reaction, can oxidatively decompose organic matters in water, reduce the concentration of the organic matters, can replace the traditional biological treatment process, and meanwhile, the micro-electrolysis process is not influenced by the environmental temperature, salt and the like, has stable operation, simple operation and can be operated automatically.
In a specific embodiment of the present utility model, the filtering device comprises a sand filter 14, a carbon filter 15 and an ultrafiltration device 16 which are sequentially connected in series, wherein the water inlet of the sand filter 14 is connected with the water outlet of the oxidation tank 13, the water outlet of the sand filter 14 is connected with the water inlet of the carbon filter 15, the water outlet of the carbon filter 15 is connected with the water inlet of the ultrafiltration device 16, and the water outlet of the ultrafiltration device 16 is connected with the water inlet of the primary RO device 17.
In a specific embodiment of the present utility model, the purified water outlet of the primary RO device 17 is connected to the water inlet of the secondary RO device 18, the concentrated water outlet of the secondary RO device 18 is connected to the water inlet of the primary RO device 17, the purified water outlet of the secondary RO device 18 is connected to the water inlet of the reuse water tank 23, and the condensed water outlet of the evaporation device 22 is connected to the water inlet of the secondary RO device 18. The primary RO device 17 adopts a sea energy low-pressure anti-pollution reverse osmosis membrane (model is PRO-XR1 or PROC 30), the filtering pressure is 1.5MPa-3.0MPa, and the recovery rate is 70% -75%; the secondary RO device 18 adopts a sea energy low-pressure anti-pollution reverse osmosis membrane (model is PROC 10), the filtering pressure is 1.5MPa-1.8MPa, and the recovery rate is 75% -80%; the waste water is subjected to organic matter, salt and the like removal in a first-stage RO device 17 and a second-stage RO device 18, and purified water produced by the second-stage RO device 18 is recycled for production;
in a specific embodiment of the present utility model, the concentrated water outlet of the primary RO device 17 is connected to the water inlet of the concentrated water treatment module, the purified water outlet of the concentrated water treatment module is connected to the water inlet of the secondary RO device 18, and the concentrated water outlet of the concentrated water treatment module is connected to the water inlet of the evaporation device 22.
In a specific embodiment of the present utility model, the concentrated water treatment module includes a concentrated water RO device 19, the filtration pressure of the concentrated water RO device 19 is 2.5MPa to 4.0MPa, the water inlet of the concentrated water RO device 19 is connected to the concentrated water outlet of the primary RO device 17, the concentrated water outlet of the concentrated water RO device 19 is connected to the water inlet of the evaporation device 22, and the purified water outlet of the concentrated water RO device 19 is connected to the water inlet of the secondary RO device 18.
In a specific embodiment of the present utility model, the concentrated water treatment module further includes a concentrated water RO device 20, the filtration pressure of the concentrated water RO device 20 is 3.5MPa to 5.0MPa, the water inlet of the concentrated water RO device 20 is connected to the concentrated water outlet of the concentrated water RO device 19, the concentrated water outlet of the concentrated water RO device 20 is connected to the water inlet of the evaporation device 22, and the purified water outlet of the concentrated water RO device 20 is connected to the water inlet of the secondary RO device 18.
In a specific embodiment of the present utility model, the concentrated water treatment module further includes an ultrahigh pressure RO device 21, the filtration pressure of the ultrahigh pressure RO device 21 is greater than 7.5MPa, the water inlet of the ultrahigh pressure RO device 21 is connected to the concentrated water outlet of the concentrated water RO device 20, the concentrated water outlet of the ultrahigh pressure RO device 21 is connected to the water inlet of the evaporation device 22, and the purified water outlet of the ultrahigh pressure RO device 21 is connected to the water inlet of the secondary RO device 18.
The utility model is used when in use:
(1) electroplating wastewater is discharged into the wastewater collection tank 11 and then enters the pretreatment unit, namely, the electroplating wastewater in the wastewater collection tank 11 is conveyed into the micro-electrolysis tank 12 by a lifting pump, an aeration mixing device is arranged in the micro-electrolysis tank 12, the wastewater enters the micro-electrolysis tank 12 filled with micro-electrolysis filler under the acidic condition, the micro-electrolysis filler can undergo oxidation-reduction reaction under the acidic condition to generate free radicals with strong oxidizing property, macromolecular organic matters in the wastewater are broken into micromolecular organic matters, and COD (chemical oxygen demand) can be removed efficiently, chromaticity is reduced and biodegradability is improved.
(2) The wastewater enters an oxidation tank 13 after undergoing the redox reaction of a micro-electrolysis tank 12, hydrogen peroxide is added into the oxidation tank 13 for reaction, and ferrous sulfate generated by the micro-electrolysis reaction and the added hydrogen peroxide react under the condition of acidic pH to generate hydroxyl ions with extremely strong oxidizing property, and the hydroxyl ions can break the chemical chain of organic matters in the water, so that most organic matters are changed into micromolecular organic matters, and the organic matter content of the wastewater is reduced.
(3) The effluent treated by the oxidation pond 13 sequentially enters a sand filter 14, a carbon filter 15 and an ultrafiltration device 16 for filtration, impurities and colloid in the wastewater are further removed, and the effluent enters a membrane treatment process, namely a recycling treatment unit.
(4) The wastewater treated by the pretreatment unit enters a first-stage RO device 17, namely the effluent treated by an ultrafiltration device 16 enters the first-stage RO device 17, the effluent of the first-stage RO device 17 enters a second-stage RO device 18, RO membranes in the first-stage RO device 17 adopt a sea energy low-pressure anti-pollution reverse osmosis membrane (model PRO-XR1 or PROC 30), the filtration pressure is 1.5MPa-3.0MPa, the recovery rate is 70% -75%, RO membranes in the second-stage RO device 18 adopt a sea energy low-pressure anti-pollution reverse osmosis membrane (model PROC 10), the filtration pressure is 1.5MPa-1.8MPa, the recovery rate is 75% -80%, the organic matters, salts and the like are removed from the wastewater in the first-stage RO device 17 and the second-stage RO device 18, and the effluent of the second-stage RO device 18 enters a recycling water tank 23 for recycling production.
(5) The salt and organic matter solution trapped by the RO membrane in the first-stage RO device 17 is discharged as the concentrated water of the membrane, enters the concentrated water RO device 19, is further filtered in the concentrated water RO device 19, RO membrane effluent in the concentrated water RO device 19 enters the second-stage RO device 18 for filtration and recycling production, and the concentrated water enters the concentrated water RO device 20 for filtration again; RO membranes in the concentrated water RO device 19 adopt sea De energy medium-pressure or high-pressure anti-pollution reverse osmosis membranes (model PRO-XR1 or PRO-LF 1), the filtering pressure is 2.5MPa-4.0MPa, and the recovery rate is 65% -70%.
(6) The purified water generated by the concentrated water RO device 19 enters the secondary RO device 18, and the concentrated water enters the concentrated water RO device 20 for secondary filtration and concentration; RO membranes in the dense water RO device 20 adopt sea energy high-pressure anti-pollution reverse osmosis membranes (model PRO-LF 1), the filtering pressure is 3.5MPa-5.0MPa, and the recovery rate is 50% -55%; the purified water generated by the dense water RO device 20 enters the secondary RO device 18 for filtering and recycling production, and the dense water enters the ultrahigh pressure RO device 21 for re-concentration; the RO membrane in the ultrahigh pressure RO device 21 adopts a sea de energy ultrahigh pressure anti-pollution reverse osmosis membrane (model PRO-XP 1), the filtering pressure is above 7.5MPa, and the recovery rate is 30% -35%; the purified water generated by the ultrahigh pressure RO device 21 enters the secondary RO device 18 for filtration and recycling production, and the concentrated water enters the evaporation device 22 for evaporation.
(7) The solution in the evaporation device 22 is heated to a set temperature by electricity or steam, the solution is continuously circulated in an evaporation chamber of the equipment by a circulating pump, the water in the wastewater is evaporated and separated from pollutants, the organic matters and the salt form solids, and the water vapor is condensed into water for recycling.
The RO membrane needs to be cleaned by medicaments (hydrochloric acid and sodium hydroxide) after being used for a period of time, and can be used continuously after being cleaned; the RO membrane adopted by the method has long service cycle, high removal rate of salt and organic matters, simple and complete cleaning and can be used for 1-2 years before replacement; the RO membrane device is provided with a high-pressure pump, a membrane component, a pressure control instrument and other equipment, and the recovery rate of the wastewater after the wastewater is filtered by the RO device can reach 80 percent.
The sea De energy brand RO membrane module adopted by the utility model is a new generation membrane separation module applied to liquid desalination/concentration aiming at high-concentration sewage treatment and recycling, zero emission and technical process treatment, and is a new generation membrane separation module applied to the fields of steel industry wastewater treatment and recycling, electroplating wastewater treatment and recycling, material concentration, brackish water desalination and the like, and can stably and economically run for a long time under the conditions of high salinity and high COD.
In the utility model, the membrane separation belongs to a physical filtration mode, is little influenced by external factors, has extremely high retention rate on inorganic salt and most COD, and effectively ensures the quality of effluent; the membrane component has the design operating pressure of 120bar, so that high-power concentration of liquid can be realized, the treatment capacity of concentrated liquid is reduced, and the investment cost and the operation cost of subsequent treatment equipment are reduced; meanwhile, the adopted roll-type packaging RO membrane is an anti-pollution high-pressure membrane of Heidenery company, the concentrated water generated by the primary RO is filtered and concentrated, and finally the concentrated water only accounts for less than 3% of the total water treatment amount, so that the water quantity required to be treated by the evaporation treatment process is greatly reduced, and the running cost and the energy consumption of the whole system are reduced.
The technical effects of the present utility model are compared with those of the prior art as shown in the following table 1:
TABLE 1
The above-described embodiments are merely preferred embodiments for fully explaining the present utility model, and the scope of the present utility model is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present utility model, and are intended to be within the scope of the present utility model. The protection scope of the utility model is subject to the claims.
Claims (10)
1. An electroplating wastewater treatment system, comprising:
the waste water collecting tank is used for collecting waste water generated by electroplating;
the pretreatment unit comprises an oxidation device and a filtering device which are sequentially connected in series, electroplating wastewater in the wastewater collection tank enters the oxidation device to undergo oxidation-reduction reaction so as to change macromolecular organic matters in the wastewater into micromolecular organic matters, and the wastewater treated by the oxidation device enters the filtering device to remove impurities and colloid in the wastewater;
the recycling treatment unit comprises a first-stage RO device, a second-stage RO device and a concentrated water treatment module, wherein the wastewater treated by the pretreatment unit sequentially enters the first-stage RO device and the second-stage RO device, the concentrated water generated by the first-stage RO device and the second-stage RO device both enter the concentrated water treatment module, and the concentrated water generated by the concentrated water treatment module enters the evaporation device;
the reuse water tank is used for collecting purified water treated by the secondary RO device, purified water treated by the concentrated water treatment module and condensed water treated by the evaporation device, and water collected in the reuse water tank meets the standard of reuse production.
2. An electroplating wastewater treatment system according to claim 1, wherein the oxidation device comprises a micro-electrolysis cell and an oxidation cell which are sequentially connected in series, wherein the water inlet of the micro-electrolysis cell is connected with the water outlet of the wastewater collection cell, the water outlet of the micro-electrolysis cell is connected with the water inlet of the oxidation cell, and the water outlet of the oxidation cell is connected with the water inlet of the filtration device.
3. The electroplating wastewater treatment system of claim 2, wherein the filtering device comprises a sand filter, a carbon filter and an ultrafiltration device which are sequentially connected in series, wherein the water inlet of the sand filter is connected with the water outlet of the oxidation pond, the water outlet of the sand filter is connected with the water inlet of the carbon filter, the water outlet of the carbon filter is connected with the water inlet of the ultrafiltration device, and the water outlet of the ultrafiltration device is connected with the water inlet of the primary RO device.
4. The electroplating wastewater treatment system of claim 1, wherein the clean water output of the primary RO device is in communication with the water inlet of the secondary RO device, the concentrate output of the secondary RO device is in communication with the water inlet of the primary RO device, and the clean water output of the secondary RO device is in communication with the water inlet of the reuse water tank.
5. The electroplating wastewater treatment system of claim 1, wherein the concentrated water output of the primary RO device is connected to the water inlet of the concentrated water treatment module, the purified water output of the concentrated water treatment module is connected to the water inlet of the secondary RO device, and the concentrated water output of the concentrated water treatment module is connected to the water inlet of the evaporation device.
6. The electroplating wastewater treatment system of claim 1, wherein the concentrate treatment module comprises a concentrate RO device, a water inlet of the concentrate RO device is connected to a concentrate outlet of the primary RO device, a concentrate outlet of the concentrate RO device is connected to a water inlet of the evaporator device, and a purified water outlet of the concentrate RO device is connected to a water inlet of the secondary RO device.
7. The electroplating wastewater treatment system of claim 6, wherein the concentrate treatment module further comprises a concentrate RO device, the water inlet of the concentrate RO device being in communication with the concentrate outlet of the concentrate RO device, the concentrate outlet of the concentrate RO device being in communication with the water inlet of the evaporator device, the water purification outlet of the concentrate RO device being in communication with the water inlet of the secondary RO device.
8. The electroplating wastewater treatment system of claim 7, wherein the concentrate treatment module further comprises an ultra-high pressure RO device, a water inlet of the ultra-high pressure RO device is connected to a concentrate outlet of the concentrate RO device, a concentrate outlet of the ultra-high pressure RO device is connected to a water inlet of the evaporation device, and a purified water outlet of the ultra-high pressure RO device is connected to a water inlet of the secondary RO device.
9. The electroplating wastewater treatment system of claim 8, wherein the filtration pressure of the primary RO device is 1.5MPa to 3.0MPa, the filtration pressure of the secondary RO device is 1.5MPa to 1.8MPa, the filtration pressure of the dense water RO device is 2.5MPa to 4.0MPa, the filtration pressure of the dense water RO device is 3.5MPa to 5.0MPa, and the filtration pressure of the ultra-high pressure RO device is greater than 7.5MPa.
10. A plating wastewater treatment system according to claim 1, wherein a condensed water outlet of said evaporation device is connected to a water inlet of said secondary RO device.
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