CN104843887A - Circuit board cleaning wastewater purifying and recycling system - Google Patents
Circuit board cleaning wastewater purifying and recycling system Download PDFInfo
- Publication number
- CN104843887A CN104843887A CN201410725889.XA CN201410725889A CN104843887A CN 104843887 A CN104843887 A CN 104843887A CN 201410725889 A CN201410725889 A CN 201410725889A CN 104843887 A CN104843887 A CN 104843887A
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- Prior art keywords
- water
- filter
- cleaning
- circuit board
- reverse osmosis
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- 238000004140 cleaning Methods 0.000 title claims abstract description 53
- 239000002351 wastewater Substances 0.000 title claims abstract description 47
- 238000004064 recycling Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 96
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 47
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 37
- 238000001914 filtration Methods 0.000 claims abstract description 24
- 239000006004 Quartz sand Substances 0.000 claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000012528 membrane Substances 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 10
- 238000010612 desalination reaction Methods 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 239000000084 colloidal system Substances 0.000 claims abstract description 8
- 238000004062 sedimentation Methods 0.000 claims abstract description 5
- 238000011001 backwashing Methods 0.000 claims description 18
- 238000000746 purification Methods 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- 239000002455 scale inhibitor Substances 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 3
- 238000011033 desalting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 239000011550 stock solution Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance 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)
Abstract
The invention provides a circuit board cleaning wastewater purifying and recycling system comprising a quartz sand filter, a multi-media filter, a self-cleaning filter, an ultrafiltration system, and a reverse osmosis system. The quartz sand filter is used for carrying out preliminary sedimentation and filtering of circuit board cleaning wastewater. The multi-media filter is used for carrying out secondary sedimentation and filtering of the water produced from the quartz sand filter. The self-cleaning filter is used for re-filtering the water produced from the multi-media filter, such that the produced water meets the requirements of ultrafiltration inlet water. The ultrafiltration system is used for carrying out deep treatment upon the water produced from the self-cleaning filter, such that suspended solids, particles, impurities and colloids in the water source are further removed. The reverse osmosis system is used for carrying out desalination upon the water produced from the ultrafiltration system with a high-desalination-rate reverse osmosis membrane element, such that the quality of outlet water completely meets the requirements of circuit board production water. With the system provided by the invention, circuit board wastewater can be purified into qualified pure water and can be reused in circuit board production, such that wastewater can be purified and recycled, discharge can be reduced, and water can be saved.
Description
Technical Field
The invention belongs to the field of environmental engineering, and particularly relates to a circuit board cleaning wastewater purifying and recycling system.
Background
With the rapid development of the electronic industry, the demand of circuit boards is increased, and the production of the circuit boards is an important basic industry of the electronic industry. The water consumption for cleaning the circuit board is huge, and the purification and recycling of the cleaning wastewater in China with increasingly serious water resource shortage are necessary: on one hand, water resources can be saved, and the water using difficulty of enterprises is reduced; on the other hand, the production cost of enterprises can be reduced, and the environmental pollution is reduced.
The cleaning wastewater for the circuit board is prepared from procedures of grinding, washing, electroplating, washing a cylinder and the like, accounts for more than 80% of the total water amount, is acidic overall, has relatively low pollutant concentration, generally has a pH value of 2-5, a COD (chemical oxygen demand) (representing the content of organic matters) of below 100mg/L and a copper ion mass concentration of below 100mg/L, and has high recycling value. The water quality requirement of the production water of the circuit board is high, and the water quality of the cleaning wastewater treated by the traditional process can hardly reach the quality standard of process water due to the high content of metal ions and organic matters.
Disclosure of Invention
Aiming at the technical problem that the quality of the cleaning wastewater treated by the traditional process is difficult to reach the quality standard of process water due to high content of metal ions and organic matters in the prior art, the invention provides a system for purifying and recycling the cleaning wastewater of the circuit board, and the purposes of purifying and recycling the wastewater, reducing emission and saving water are achieved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a circuit board cleaning wastewater purification and recycling system comprises a quartz sand filter, a multi-medium filter, a self-cleaning filter, an ultrafiltration system and a reverse osmosis system; wherein,
the quartz sand filter is used for carrying out preliminary precipitation and filtration on the circuit board cleaning wastewater to preliminarily remove various suspended matters, colloids, particles and impurities in the wastewater;
the multi-medium filter is used for carrying out secondary sedimentation and filtration on the produced water of the quartz sand filter, so that the SDI and the turbidity of the produced water meet the self-cleaning water inlet requirement;
the self-cleaning filter is used for filtering the water produced by the multi-medium filter again, so that the produced water meets the requirement of ultrafiltration water inflow;
the ultrafiltration system carries out advanced treatment on the water produced by the self-cleaning filter, further removes suspended matters, particles, impurities and colloids in a water source, and removes partial COD and chromaticity;
the reverse osmosis system adopts a reverse osmosis membrane element with high desalination rate to desalt the water produced by the ultrafiltration system, so that the water quality of the effluent completely meets the requirement of circuit board production water.
According to the circuit board cleaning wastewater purification and recycling system provided by the invention, the quartz sand filter is used for primarily filtering the wastewater stock solution, the multi-medium filter is used for secondarily filtering, the self-cleaning filter is used for thirdly filtering, the ultrafiltration system is used for deeply treating, and the reverse osmosis system is used for desalting, so that the circuit board wastewater can be finally purified into qualified pure water and can be applied to circuit board production again, the purposes of wastewater purification and recycling, emission reduction and water saving are achieved, the operation is simple, and the system has the advantages of high efficiency, stability, simplicity, convenience and low cost, and can be widely applied to the circuit board industry cleaning wastewater purification and recycling.
Furthermore, the quartz sand filter and the multi-medium filter are respectively provided with a set of backwashing system, and backwashing water is reverse osmosis concentrated water.
Further, a plate heat exchanger is arranged between the multi-medium filter and the self-cleaning filter.
Further, the ultrafiltration system is provided with a scale inhibitor and a reducing agent dosing device.
Further, the ultrafiltration system and the multi-media filter share a set of backwashing system.
Further, a first security filter and a second security filter are arranged in front of the reverse osmosis system.
Further, the filtering precision of the first security filter is 5 microns, and the filtering precision of the second security filter is 1 micron.
Further, the salt rejection of the high salt rejection reverse osmosis membrane element is greater than or equal to 99.5%.
Further, the conductivity of the outlet water of the reverse osmosis system is less than 10 mu s/cm.
Drawings
FIG. 1 is a schematic flow chart of a circuit board cleaning wastewater purification and recycling system provided by the invention.
In the figure, 1, a wastewater tank; 11. a quartz sand filter; 12. a multi-media filter; 13. a self-cleaning filter; 14. an ultrafiltration system; 141. an ultrafiltration water-producing tank; 142. scale inhibitor and reducing agent dosing device; 15. a reverse osmosis system; 151. a reverse osmosis water producing tank; 152. a reverse osmosis concentrated water tank; 2. a lift pump; 3. a booster pump; 4. a high pressure pump; 5. a backwash pump; 6. a plate heat exchanger; 7. a first security filter; 8. a second cartridge filter.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Referring to fig. 1, a circuit board cleaning wastewater purifying and recycling system includes a quartz sand filter 11, a multi-media filter 12, a self-cleaning filter 13, an ultrafiltration system 14 and a reverse osmosis system 15; wherein,
the quartz sand filter 11 performs preliminary precipitation and filtration on the circuit board cleaning wastewater to preliminarily remove various suspended matters, colloids, particles and impurities in the wastewater;
the multi-medium filter 12 is used for carrying out secondary sedimentation and filtration on the produced water of the quartz sand filter 11, so as to ensure that the SDI (pollution index) and the turbidity of the produced water meet the requirements of self-cleaning water inlet;
the self-cleaning filter 13 is used for filtering the water produced by the multi-medium filter 12 again to ensure that the produced water meets the requirement of ultrafiltration water inlet;
the ultrafiltration system 14 carries out advanced treatment on the water produced by the self-cleaning filter 13, further removes suspended matters, particles, impurities and colloids in a water source, and removes partial COD and chromaticity;
the reverse osmosis system 15 adopts a high desalination rate reverse osmosis membrane element to desalt the water produced by the ultrafiltration system 14, so that the water quality of the effluent completely meets the requirement of circuit board production water.
According to the circuit board cleaning wastewater purification and recycling system provided by the invention, the quartz sand filter is used for primarily filtering the wastewater stock solution, the multi-medium filter is used for secondarily filtering, the self-cleaning filter is used for thirdly filtering, the ultrafiltration system is used for deeply treating, and the reverse osmosis system is used for desalting, so that the circuit board wastewater can be finally purified into qualified pure water and can be applied to circuit board production again, the purposes of wastewater purification and recycling, emission reduction and water saving are achieved, the operation is simple, and the system has the advantages of high efficiency, stability, simplicity, convenience and low cost, and can be widely applied to the circuit board industry cleaning wastewater purification and recycling.
Specifically, referring to fig. 1, the regulated, coagulated, precipitated and oxidized circuit board wastewater or the circuit board wastewater after physicochemical and biochemical treatment is collected in a wastewater tank 1, the circuit board wastewater in the wastewater tank is transported to the quartz sand filter 11 by a lift pump 2, and then passes through the multi-media filter 12, the self-cleaning filter 13 and the ultrafiltration system 14 (ultrafiltration host), the produced water of the ultrafiltration system 14 is collected in an ultrafiltration production water tank 141, and then the ultrafiltration production water is transported to the reverse osmosis system 15 (reverse osmosis host) by a booster pump 3 and a high pressure pump 4, and finally the effluent of the reverse osmosis system 15 is collected in a reverse osmosis production water tank 151, and the produced reverse osmosis concentrated water is collected in a reverse osmosis concentrated water tank 152. Wherein, the self-cleaning filter 13 ensures that the produced water meets the requirement of ultrafiltration water inlet, and aims to ensure the stability and safety of the operation of the ultrafiltration system 14 to the utmost extent; the ultrafiltration system 14 has the advantages of high operation reliability, strong pollution resistance, large water permeability, small occupied area, simple and convenient maintenance, stable effluent quality, long service life and the like, and can ensure that the inlet water of the reverse osmosis system 15 meets the inlet water requirement of the high desalination membrane element and the stability and safety of the system.
As a specific example, please refer to fig. 1, wherein the quartz sand filter 11 and the multi-media filter 12 are respectively provided with a set of backwashing system, and backwashing water is reverse osmosis concentrated water; specifically, the backwashing system is connected with the reverse osmosis concentrated water tank 152 through a backwashing pump 5, and the reverse osmosis concentrated water in the reverse osmosis concentrated water tank 152 is conveyed to the backwashing system through the backwashing pump 5, so as to perform backwashing treatment on the quartz sand filter 11 and the multimedia filter 12. The method specifically comprises the following steps: the head loss is increased continuously along with the continuous accumulation of impurities in the packing layer, and when the head loss reaches a certain set limit (when the pressure difference of the inlet water and the outlet water of the filter is increased by 0.07MPa compared with that of the filter when the filter just starts to operate), the system is switched to a backwashing state to clean the accumulated impurities and prevent the quartz sand from being hardened into blocks due to long-time operation; compressed air can be introduced during backwashing to enhance the backwashing effect.
As a specific example, referring to fig. 1, a plate heat exchanger 6 is installed between the multi-media filter 12 and the self-cleaning filter 13, and the temperature of reverse osmosis inlet water is controlled by the heat exchanger to be between 24 ℃ and 26 ℃, so that scale formed on the reverse osmosis membrane surface by the insoluble salt and suspended matters (mainly inorganic particles, colloids, microorganisms, algae, and the like) deposited on the reverse osmosis membrane surface can be removed.
As a specific example, please refer to fig. 1, the ultrafiltration system 14 is provided with a scale inhibitor and reducing agent feeding device 142; specifically, the scale inhibitor and reducing agent adding device 142 is connected to the pipeline between the ultrafiltration product water tank 141 and the booster pump 3, specifically, when adding the scale inhibitor, the scale formation on the reverse osmosis concentrated water side is prevented, and when adding the reducing agent, the oxidation of the reverse osmosis membrane by the oxidizing substance in the source water is prevented.
As a specific example, the ultrafiltration system 14 and the multimedia filter 12 share a set of backwashing system, and the organic and inorganic matters trapped on the surface of the ultrafiltration membrane can be removed by the shared backwashing system, so that the water production capacity of the ultrafiltration membrane is restored.
As an embodiment, referring to fig. 1, a first safety filter 7 and a second safety filter 8 are installed in front of the reverse osmosis system 15, so as to ensure that reverse osmosis membrane elements are not damaged by suspended particles.
In a preferred embodiment, the filtration precision of the first security filter 7 is 5 microns, and the filtration precision of the second security filter 8 is 1 micron, so that the first security filter 7 can intercept particles larger than 5 microns, and the second security filter 8 can intercept particles larger than 1 micron, thereby realizing double protection and ensuring that the reverse osmosis membrane operates more safely.
As a specific embodiment, the reverse osmosis system 15 adopts a high desalination rate reverse osmosis membrane element with a desalination rate of 99.5% or more, so that most of ions in water can be removed to meet the water demand.
As a specific example, the conductivity of the outlet water of the reverse osmosis system 15 is less than 10 mus/cm, thereby ensuring the water demand for water using electricity.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.
Claims (9)
1. A circuit board cleaning wastewater purification and recycling system is characterized by comprising a quartz sand filter, a multi-medium filter, a self-cleaning filter, an ultrafiltration system and a reverse osmosis system; wherein,
the quartz sand filter is used for carrying out preliminary precipitation and filtration on the circuit board cleaning wastewater to preliminarily remove various suspended matters, colloids, particles and impurities in the wastewater;
the multi-medium filter is used for carrying out secondary sedimentation and filtration on the produced water of the quartz sand filter, so that the SDI and the turbidity of the produced water meet the self-cleaning water inlet requirement;
the self-cleaning filter is used for filtering the water produced by the multi-medium filter again, so that the produced water meets the requirement of ultrafiltration water inflow;
the ultrafiltration system carries out advanced treatment on the water produced by the self-cleaning filter, further removes suspended matters, particles, impurities and colloids in a water source, and removes partial COD and chromaticity;
the reverse osmosis system adopts a reverse osmosis membrane element with high desalination rate to desalt the water produced by the ultrafiltration system, so that the water quality of the effluent completely meets the requirement of circuit board production water.
2. The system for purifying and recycling the waste water generated in the cleaning of the circuit board according to claim 1, wherein the quartz sand filter and the multi-media filter are respectively provided with a set of backwashing system, and the backwashing water is reverse osmosis concentrated water.
3. The system for purifying and recycling waste water generated by cleaning circuit boards according to claim 1, wherein a plate heat exchanger is arranged between the multi-media filter and the self-cleaning filter.
4. The system for purifying and recycling the circuit board cleaning wastewater according to claim 1, wherein the ultrafiltration system is provided with a scale inhibitor and a reducing agent dosing device.
5. The system for purifying and recycling the waste water generated by cleaning the circuit board according to claim 1, wherein the ultrafiltration system and the multi-media filter share a set of backwashing system.
6. The system for purifying and recycling waste water generated by cleaning circuit boards according to claim 1, wherein a first security filter and a second security filter are arranged in front of the reverse osmosis system.
7. The wastewater purifying and recycling system for cleaning and recycling circuit boards according to claim 6, wherein the filtration precision of the first security filter is 5 microns, and the filtration precision of the second security filter is 1 micron.
8. The system for purifying and recycling circuit board cleaning wastewater according to claim 1, wherein the desalination rate of the high desalination rate reverse osmosis membrane element is greater than or equal to 99.5%.
9. The system for purifying and recycling waste water generated in cleaning circuit boards according to claim 1, wherein the conductivity of the outlet water of the reverse osmosis system is less than 10 μ s/cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410725889.XA CN104843887A (en) | 2014-12-03 | 2014-12-03 | Circuit board cleaning wastewater purifying and recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410725889.XA CN104843887A (en) | 2014-12-03 | 2014-12-03 | Circuit board cleaning wastewater purifying and recycling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104843887A true CN104843887A (en) | 2015-08-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410725889.XA Pending CN104843887A (en) | 2014-12-03 | 2014-12-03 | Circuit board cleaning wastewater purifying and recycling system |
Country Status (1)
| Country | Link |
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| CN (1) | CN104843887A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111533336A (en) * | 2020-05-09 | 2020-08-14 | 江苏澳特克环境科技有限公司 | Method for recycling cleaning waste liquid |
| CN112028273A (en) * | 2020-07-30 | 2020-12-04 | 中冶南方都市环保工程技术股份有限公司 | High-recovery-rate reclaimed water recycling advanced treatment system and treatment method |
| CN115490366A (en) * | 2022-10-08 | 2022-12-20 | 惠州市成泰环保智能科技有限公司 | Low-emission recycling process for PCB (printed Circuit Board) production water |
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2014
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111533336A (en) * | 2020-05-09 | 2020-08-14 | 江苏澳特克环境科技有限公司 | Method for recycling cleaning waste liquid |
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| CN115490366A (en) * | 2022-10-08 | 2022-12-20 | 惠州市成泰环保智能科技有限公司 | Low-emission recycling process for PCB (printed Circuit Board) production water |
| CN115490366B (en) * | 2022-10-08 | 2024-04-26 | 惠州市成泰环保智能科技有限公司 | Low-emission recycling process for PCB (printed circuit board) production water |
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Application publication date: 20150819 |