CN220537631U - Treatment system for realizing zero discharge of electroplating chromium-containing wastewater - Google Patents
Treatment system for realizing zero discharge of electroplating chromium-containing wastewater Download PDFInfo
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- CN220537631U CN220537631U CN202321877240.0U CN202321877240U CN220537631U CN 220537631 U CN220537631 U CN 220537631U CN 202321877240 U CN202321877240 U CN 202321877240U CN 220537631 U CN220537631 U CN 220537631U
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- 239000002351 wastewater Substances 0.000 title claims abstract description 41
- 238000009713 electroplating Methods 0.000 title claims abstract description 40
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 36
- 239000011651 chromium Substances 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 157
- 238000004064 recycling Methods 0.000 claims abstract description 43
- 150000003839 salts Chemical class 0.000 claims abstract description 22
- 239000012528 membrane Substances 0.000 claims abstract description 19
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 18
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 17
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 238000001179 sorption measurement Methods 0.000 claims abstract description 12
- 238000002425 crystallisation Methods 0.000 claims abstract description 5
- 230000008025 crystallization Effects 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000004793 Polystyrene Substances 0.000 claims description 4
- 239000003957 anion exchange resin Substances 0.000 claims description 4
- 229920002223 polystyrene Polymers 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 8
- 231100000719 pollutant Toxicity 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 239000013078 crystal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000026676 system process Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 231100000171 higher toxicity Toxicity 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The utility model provides a treatment system for realizing zero discharge of electroplating chromium-containing wastewater, which is characterized by comprising an electroplating chromium-containing wastewater tank, a multi-medium filter, hexavalent chromium adsorption resin, a pH regulating tank, an ultrafiltration membrane system, an intermediate water tank, a recycling system and a salt recycling system; the recycling system comprises a primary RO system, a primary water producing tank, a secondary RO system and a recycling water tank, and the water discharged from the recycling water tank is directly recycled to enterprises; the salt recycling system comprises a first-stage concentrated water tank, a concentrated water concentration reverse osmosis system, a high-concentration water tank and an evaporator, and the crystallization product of the evaporator is used for recycling salt. The system can realize zero emission treatment of pollutants and recycling utilization of water and crystalline salt.
Description
Technical Field
The utility model relates to an electroplating chromium-containing wastewater treatment system, in particular to a treatment system for realizing zero discharge of electroplating chromium-containing wastewater.
Technical Field
With the rapid development of the electroplating industry, the environmental pollution problem caused by the electroplating industry is continuously aggravated. The electroplating wastewater has complex components and contains a large amount of heavy metals. Chromium metal is widely applied to the industrial fields of metal electroplating, paint and pigment, leather tanning, textile dyeing, wood corrosion prevention, refractory materials and the like, is one of main pollutants in electroplating wastewater, and chromium in the electroplating wastewater mainly exists in hexavalent chromium and trivalent chromium forms, wherein the hexavalent chromium has higher toxicity, has carcinogenic action, can generate serious pollution after being discharged into the environment, and threatens the health of human bodies, so that the wastewater is discharged after reaching standards after being properly treated.
Although many well-established systems for treating electroplating chromium-containing wastewater exist, these systems still have problems during operation: (1) ZL2022201976054 discloses a chromium-containing electroplating wastewater treatment device, which can overcome the defects of unstable treatment effect and large occupied area of the original process on the basis of a reduction-chemical precipitation method, but the device can not realize zero emission treatment, a certain amount of pollutants still need to be discharged in the treatment process, and secondary pollution is easily caused to the environment along with the continuous accumulation of the pollutants in the environment; (2) Because of the complexity of pollutants in the electroplating chromium-containing wastewater, most of the existing treatment systems for the electroplating chromium-containing wastewater only carry out process design from the point of reaching the standard of treated effluent, and the existing treatment processes for realizing resource utilization while reaching the standard of treatment are few. The utility model aims to invent a treatment system for realizing zero discharge of electroplating chromium-containing wastewater, which combines the water quality characteristics of the electroplating chromium-containing wastewater, and develops a treatment system capable of efficiently and stably treating the electroplating chromium-containing wastewater through system process optimization and operation parameter adjustment. The system can realize zero emission treatment of pollutants and recycling utilization of water and crystalline salt.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a treatment system for realizing zero discharge of electroplating chromium-containing wastewater, which adopts the following technical scheme:
a treatment system for realizing zero discharge of electroplating chromium-containing wastewater is characterized by comprising an electroplating chromium-containing wastewater pool, a multi-medium filter, hexavalent chromium adsorption resin, a pH regulating tank, an ultrafiltration membrane system, an intermediate water tank, a recycling system and a salt recycling system; the recycling system comprises a primary RO system, a primary water producing tank, a secondary RO system and a recycling water tank, and the water discharged from the recycling water tank is directly recycled to enterprises; the salt recycling system comprises a first-stage concentrated water tank, a concentrated water concentration reverse osmosis system, a high-concentration water tank and an evaporator, and the crystallization product of the evaporator is used for recycling salt.
Further, the concentrated water of the primary RO system enters the primary concentrated water tank, and the water produced by the primary RO system enters the primary water production tank; the concentrated water of the secondary RO system enters the intermediate water tank, and the water produced by the secondary RO system enters the reuse water tank; the concentrated water of the concentrated water reverse osmosis system enters the high-concentration water tank, and the water produced by the concentrated water reverse osmosis system enters the first-stage water production tank.
Further, the condensed water generated by the evaporator enters the primary water production tank for treatment.
Further, the hexavalent chromium adsorption resin adopts a strong base anion exchange resin with a polystyrene architecture.
Further, the ultrafiltration membrane system adopts an immersed ultrafiltration membrane or an external ultrafiltration membrane.
Compared with the prior art, the utility model has the advantages that:
(1) The system can realize that the treated effluent reaches the water quality standard of class B in the water quality standard of metal plating and chemical coverage process water through a two-stage RO system, meets the standard of reuse water, can be used for enterprise production, further realizes the recycling of water resources, effectively saves water and avoids waste;
(2) The system concentrates the concentrated water of the first-stage concentration reverse osmosis system and combines an evaporation process to enable salts in the concentrated water to form crystals, and the crystals have high purity and are beneficial to subsequent recycling treatment;
(3) Independent filter devices are arranged in front of the hexavalent chromium adsorption resin and the primary RO system respectively, and the arrangement of the device can effectively avoid membrane blockage, so that continuous and stable operation of the treatment system is ensured;
(4) The system integrally realizes zero discharge of electroplating chromium-containing wastewater, and meanwhile, salt crystals generated by the system are sold or recovered, so that a certain benefit can be obtained, and the production cost is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present utility model;
Detailed Description
The utility model is further illustrated and described below with reference to the drawings and detailed description.
As shown in figure 1, the treatment system for realizing zero discharge of electroplating chromium-containing wastewater comprises an electroplating chromium-containing wastewater tank, a multi-medium filter, hexavalent chromium adsorption resin, a pH adjusting tank, an ultrafiltration membrane system, an intermediate water tank, a recycling system and a salt recycling system; the recycling system comprises a primary RO system, a primary water producing tank, a secondary RO system and a recycling water tank, and the water discharged from the recycling water tank is directly recycled to enterprises; the salt recycling system comprises a first-stage concentrated water tank, a concentrated water concentration reverse osmosis system, a high-concentration water tank and an evaporator, and the crystallization product of the evaporator is used for recycling salt.
The primary RO system concentrated water enters the primary concentrated water tank, and the primary RO system produced water enters the primary produced water tank; the concentrated water of the secondary RO system enters the intermediate water tank, and the water produced by the secondary RO system enters the reuse water tank; the concentrated water of the concentrated water concentration reverse osmosis system enters the high-concentration water tank, and the water produced by the concentrated water concentration reverse osmosis system enters the first-stage water production tank; condensed water generated by the evaporator enters the primary water producing tank for treatment; the hexavalent chromium adsorption resin adopts a strong base anion exchange resin with a polystyrene architecture; the ultrafiltration membrane system adopts an immersed ultrafiltration membrane or an external ultrafiltration membrane.
The processing flow of the system is as follows: the wastewater in the electroplating chromium-containing wastewater pool enters a multi-medium filter, so that suspended impurities in the wastewater are effectively removed; the effluent of the multi-medium filter enters hexavalent chromium adsorption resin, and hexavalent chromium in the wastewater is removed to less than 0.1mg/L in the process; enabling hexavalent chromium adsorption resin effluent to enter a pH regulating tank, and controlling the pH range to be 7.5-8.0, so that other metal ions in the wastewater form suspended matters; the effluent of the pH regulating tank enters an ultrafiltration membrane system, the system enables suspended matters to be separated and removed, the collected suspended matters are concentrated and then press-filtered into mud cakes, and the mud cakes are subjected to hazardous waste treatment; the effluent of the ultrafiltration membrane system enters an intermediate water tank; the water from the intermediate water tank enters a first-stage RO system, the water from the first-stage RO system enters a first-stage water producing tank, the water from the first-stage water producing tank enters a second-stage RO system, the water from the second-stage RO system enters a recycling water tank, the concentrated water from the second-stage RO system flows back to the intermediate water tank, and the water from the recycling water tank reaches the water quality standard of class B of the water quality standard of metal plating and chemical coverage process water, so that the water can be directly used for enterprise production; the concentrated water of the primary RO system enters a primary concentrated water tank, the water discharged from the primary concentrated water tank enters a concentrated reverse osmosis system, the concentrated water of the concentrated reverse osmosis system enters a high-concentration water tank, the water produced by the concentrated reverse osmosis system enters a primary water production tank, the water discharged from the high-concentration water tank enters an evaporator, condensed water produced under the high-temperature evaporation effect flows back to the primary water production tank, and the produced salt crystal is subjected to resource treatment outside the water supply, wherein the main component is anhydrous sodium sulphate.
At present, a treatment system for electroplating chromium-containing wastewater is mostly designed from the point of reaching the standard of treated effluent, and has few treatment processes capable of realizing resource utilization while reaching the standard, and zero emission treatment is difficult to realize by the existing treatment processes. The utility model combines the water quality characteristics of the electroplating chromium-containing wastewater, and develops a treatment system capable of efficiently and stably treating the electroplating chromium-containing wastewater through system process optimization and operation parameter adjustment. The system can realize zero emission treatment of pollutants and recycling of water and metal salt.
Examples
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments of the present utility model.
By adopting the technical scheme, the treatment system for realizing zero discharge of the electroplating chromium-containing wastewater is manufactured in a trial manner, and as shown in fig. 1, the treatment object is the electroplating chromium-containing wastewater.
The system comprises an electroplating chromium-containing wastewater pool, a multi-medium filter, hexavalent chromium adsorption resin, a pH adjusting pool, an ultrafiltration membrane system, an intermediate water tank, a recycling system and a salt recycling system; the recycling system comprises a primary RO system, a primary water producing tank, a secondary RO system and a recycling water tank, and the water discharged from the recycling water tank is directly recycled to enterprises; the salt recycling system comprises a first-stage concentrated water tank, a concentrated water concentration reverse osmosis system, a high-concentration water tank and an evaporator, and the crystallization product of the evaporator is used for recycling salt.
The primary RO system concentrated water enters the primary concentrated water tank, and the primary RO system produced water enters the primary produced water tank; the concentrated water of the secondary RO system enters the intermediate water tank, and the water produced by the secondary RO system enters the reuse water tank; the concentrated water of the concentrated water concentration reverse osmosis system enters the high-concentration water tank, and the water produced by the concentrated water concentration reverse osmosis system enters the first-stage water production tank; condensed water generated by the evaporator enters the primary water producing tank for treatment; the hexavalent chromium adsorption resin adopts strong base anion exchange resin with polystyrene architecture; the ultrafiltration membrane system adopts an immersed ultrafiltration membrane.
The system is used for treating the chromium-containing electroplating wastewater, continuously runs every day, continuously monitors running data for about three months, the average value of the water quality of the treated water and the recycled water of the system is shown in the table 1, the removal rate of pollutants is up to 99.9%, the water quality of the recycled water meets the B-type water quality standard of the metal plating and chemical coverage process water quality standard, and the recycled water can be directly reused for enterprise production. The yield of salt crystals produced by the system is 0.2% of the original water, the purity is up to more than 95%, the market price is 300 yuan/ton, and the treatment cost of wastewater is further reduced. Therefore, the system has good treatment effect on the electroplating chromium-containing wastewater and high recycling treatment degree.
Table 1 System for treating Water quality of Inlet and outlet Water
| Index (I) | Hexavalent chromium (mg/L) | Total chromium (mg/L) | Conductivity (uS/cm) |
| Inflow of water | 500 | 600 | 5000 |
| Reuse water | ＜0.1 | ＜0.1 | 50 |
| Removal rate of | 99.9％ | 99.9％ | 99％ |
The above examples are only intended to illustrate one embodiment of the present utility model, not to limit it. It should be noted that: modifications of the technical solutions described in the above embodiments or equivalent substitutions of some or all of the technical features thereof may be made by those skilled in the art; these modifications or substitutions do not depart from the essence of the corresponding technical solutions from the protection scope of the technical solutions of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Claims (5)
1. A treatment system for realizing zero discharge of electroplating chromium-containing wastewater is characterized by comprising an electroplating chromium-containing wastewater pool, a multi-medium filter, hexavalent chromium adsorption resin, a pH regulating tank, an ultrafiltration membrane system, an intermediate water tank, a recycling system and a salt recycling system; the recycling system comprises a primary RO system, a primary water producing tank, a secondary RO system and a recycling water tank, and the water discharged from the recycling water tank is directly recycled to enterprises; the salt recycling system comprises a first-stage concentrated water tank, a concentrated water concentration reverse osmosis system, a high-concentration water tank and an evaporator, and the crystallization product of the evaporator is used for recycling salt.
2. The treatment system for realizing zero discharge of electroplating chromium-containing wastewater according to claim 1, wherein the primary RO system concentrate enters the primary concentrate tank, and the primary RO system product water enters the primary product tank; the concentrated water of the secondary RO system enters the intermediate water tank, and the water produced by the secondary RO system enters the reuse water tank; the concentrated water of the concentrated water reverse osmosis system enters the high-concentration water tank, and the water produced by the concentrated water reverse osmosis system enters the first-stage water production tank.
3. The treatment system for realizing zero discharge of chromium-containing electroplating wastewater according to claim 1, wherein condensed water generated by the evaporator enters the primary water production tank for treatment.
4. The treatment system for realizing zero discharge of electroplating chromium-containing wastewater according to claim 1, wherein the hexavalent chromium adsorption resin is a strong base anion exchange resin with a polystyrene architecture.
5. The treatment system for realizing zero discharge of electroplating chromium-containing wastewater according to claim 1, wherein the ultrafiltration membrane system adopts an immersed ultrafiltration membrane or an external ultrafiltration membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321877240.0U CN220537631U (en) | 2023-07-17 | 2023-07-17 | Treatment system for realizing zero discharge of electroplating chromium-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321877240.0U CN220537631U (en) | 2023-07-17 | 2023-07-17 | Treatment system for realizing zero discharge of electroplating chromium-containing wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220537631U true CN220537631U (en) | 2024-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321877240.0U Active CN220537631U (en) | 2023-07-17 | 2023-07-17 | Treatment system for realizing zero discharge of electroplating chromium-containing wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220537631U (en) |
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2023
- 2023-07-17 CN CN202321877240.0U patent/CN220537631U/en active Active
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