CN101219304B - Method and system for processing wastewater of cleaning printed circuit board - Google Patents
Method and system for processing wastewater of cleaning printed circuit board Download PDFInfo
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- CN101219304B CN101219304B CN2007101896929A CN200710189692A CN101219304B CN 101219304 B CN101219304 B CN 101219304B CN 2007101896929 A CN2007101896929 A CN 2007101896929A CN 200710189692 A CN200710189692 A CN 200710189692A CN 101219304 B CN101219304 B CN 101219304B
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- filter
- porous ceramics
- circuit board
- printed circuit
- sic porous
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Abstract
The invention relates to a processing method and a system of rinsing waster water in a printed circuit board. The method carries out the solid-liquid separation of the rinsing waste water, filters the waste water to control the particles in the waste water not to be larger than 30 micron and then filters the waste water to set discharge standard through a SiC porous ceramic filter leaf. The system comprises a solid-liquid separating device, a preliminary filtering unit and a depth-type filtering unit. The preliminary filtering unit uses a filtering net or a high molecular film to be a filtering element; the depth-type filtering unit comprises a multilevel filtering unit that uses the SiC porous ceramic filter leaf as the filtering element. The set level of the filtering unit causes drained water after filtering to meet the set standard. The invention adopts the physical filter and adsorption instead of the chemical reaction, thus having remarkable absorption and filter effect of heavy metal ions without introducing other substances. With low cost, little energy consumption, simple operation, small occupied area and wide application scope, the invention has the good application outlook and the remarkable social benefits.
Description
(1) technical field
The present invention relates to a kind of processing method and system of wastewater of cleaning printed circuit board.
(2) background technology
The printed circuit board production technology is as follows: raw sheet → whole (boring) → chemical treatment of material cut-out → material (copper facing) → subsides dry film → exposure → alkaline development → etching → alkalescence peels off → and interim work → hot pressing → surface (plating) → sharp processing (boring) → the process antirust processing → inspection → bale packing shipment of pressing of fitting → film of drying → whole → surface coating.In process of production, can use multiple industrial chemicals, the kind of waste water of generation is various, complicated component, and pH changes greatly.Different production processes are cleaned the waste water and the waste liquid that are produced and are contained pollutant of different nature, and heavy metal compound is arranged, and synthetic high polymer organic matter and various organic additive are also arranged.The heavy metal contaminants major part exists with the free ions attitude, is mainly Cu
2+, Ni
2+, Pb
2+Deng, the part heavy metal exists with the form of complex compound, as EDTA-Cu and Cu (NH
3)
4 2+Deng.
The treatment process of wastewater of cleaning printed circuit board is at present both at home and abroad all based on physical-chemical process.After the pH value of waste water is adjusted to certain limit, add various medicaments, make heavy metal and medicine produce chemical reaction, flocculation sediment, mud separates, and supernatant water is adjusted the discharging of pH value back again.Ion-exchange also belongs to the category of physics, chemical method.To the removal of organic pollution COD, level oxidation or charcoal absorption are handled after general the employing.But the chemical treatment cost is higher in the conventional method, and waste water and waste liquid that different operation is discharged will just can reach discharge standard through different processing.Though concerning large-scale producer, because enough fund inputs are arranged, can handle separately categorizedly by the different operations of wet processing waste water fully, discharging is concentrated in back up to standard respectively, but also has the waste water treatment process complexity, sewage treatment equipment is huge, floor space is big, and power consumption is big, and investment is many, management is difficult, the not wield problem of operating personnel.For medium-sized and small enterprises, then be unfavorable for fully applying.
(3) summary of the invention
The object of the present invention is to provide a kind of processing method of wastewater of cleaning printed circuit board, can reduce fund input and energy consumption, simplified treatment process, be suitable for various types of printed circuit board (PCB) manufacturer and use.
Further aim of the present invention provides a kind of treatment system of wastewater of cleaning printed circuit board, and equipment is few, assembling connects simply, it is few to take up an area of, and greatly reduces the equipment funds input.
The technical solution used in the present invention is as follows:
A kind of processing method of wastewater of cleaning printed circuit board will be cleaned waste water and be carried out Separation of Solid and Liquid earlier, and the particle that filters then in the control waste water is not more than 30 μ m, is filtered to the setting discharge standard by SiC porous ceramics filter more afterwards.
This method mainly is that the heavy metal ion in the waste water is handled, particularly Cu
2+, Ni
2+, Pb
2+, Sn
2+Etc. heavy metal ion.
Concrete, clean waste water and can carry out Separation of Solid and Liquid by sedimentation processing or centrifugation.Utilize filter screen or polymeric membrane to filter, and no matter be to use filter screen or polymeric membrane to filter when still SiC porous ceramics filter filters, can take multistage filtering as required with the granular size in the control waste water.
Described filter screen, polymeric membrane can directly be bought the commercially available prod, as long as the particle that satisfies in the waste water of filter back is not more than 30 μ m.
SiC porous ceramics filter has advantages such as intensity height, heat and corrosion resistant, heat shock resistance, Stability Analysis of Structures, long service life and stability in use are good.By reasonable structural design, can make the harmful substance in the sewage filter eliminating, reach discharge standard.The preferred aperture of the present invention is the SiC porous ceramics filter that 5～30 μ m pores are solid netted distribution, and when adopting multistage filtering, the aperture of filter adopts the gradient distribution design to reduce step by step, can significantly improve filtering accuracy and filtering rate.Pore is solid netted distribution, it filters mainly and finishes by surface interception, diffusion, collision absorption, its filter sizes to liquid is 1/10～1/5 of a pore size, promptly the particle size that can pass through at last is at 0.5-1 μ m, SiC porous ceramics filter is good to the adsorption effect of heavy metal ion, through multistage filtering absorption, clean waste water and can reach discharge standard.
Described SiC porous ceramics filter can be prepared in accordance with the following methods: the silicon carbide micro-powder, carbon dust, clay and the potassic feldspar that adopt 10～100 μ m, in 30～60: 30～50: 5～20: 5～10 mass parts ratio wet-mixing, after dry-pressing formed, sintering promptly gets described SiC porous ceramics filter under 1200-1300 ℃ high temperature, intensity height, high temperature resistant, corrosion-resistant, average pore size between 5～30 μ m, the porosity 〉=60%.
The present invention also provides a kind of treatment system of wastewater of cleaning printed circuit board, comprise equipment for separating liquid from solid, preliminary filter, depth-type filtration device, described preliminary filter is a filter element with filter screen or polymeric membrane, it is the filter element of filter element with SiC porous ceramics filter that described depth-type filtration device comprises multistage, and the progression of filter element is arranged so that filtering the back draining reaches established standards.
Described equipment for separating liquid from solid can adopt centrifuge to carry out centrifugation or settling tank, if when using settling tank, can with described be that the primary filter device of filter element cleans waterwater entrance to the setting of outlet interbody spacer from settling tank with the multistorey strainer mesh, make and clean waste water from the process of inlet outflow outlet, the strainer filtering that be arranged in parallel that reduces gradually through the aperture successively, so not only simplify technology, also saved floor space.
SiC porous ceramics filter adopts carrier supported in the filter element, washer sealing, and,, have certain corrosivity because sewage is alkalescence with the flange connection, so adopt corrosion resistant silica gel plate packing ring.
In general, in the wastewater of cleaning printed circuit board mainly be Cu
2+, Ni
2+, Pb
2+And other heavy metal ion such as the solid particle less such as tin, gold, silver with some particle diameters, when waste water is crossed SiC porous ceramics filter, because the holding back of porous ceramics filter, seizure effect make waste water effectively be filtered in the process by SiC porous ceramics filter; Add the suction-operated of pore inside, the solid particle major part is filtered, and a large amount of heavy metal ion also is filtered, adsorbs; The inner solid netted air vent channel of the main dependence of cause porous ceramics filter adsorbs subparticle and catches, so relative other filter plants of the pressure loss are less.After a period of time is carried out in filtration, porous ceramics filter surface forms filter cake and thickening gradually, also deposited subparticle on the porous ceramics filter internal porosity conduit wall, at this moment can influence the handling capacity of liquid, therefore preferably SiC porous ceramics filter blowback system is set at every grade of filter element, the porous ceramics filter is carried out blowback handle, concrete, can in filter element, reserve inlet to insert pressure-air or to utilize the gas-vapor mix Rapid Cleaning.Further, for the not operation of interrupting device when the porous ceramics filter is cleared up, guarantee the rate of filtration of porous ceramics, it is the filtration branch road of filter element with SiC porous ceramics filter that every grade of filter element is provided with arranged side by side, the porous ceramics filter of a branch road stops up in the time of need carrying out blowback therein, and another branch road can operate as normal.But, be difficult for blowback and remove, thereby heavy metal ion will be kept in the porous ceramics filter because heavy metal ion generally adheres to the inwall in hole; When the device internal pressure reaches certain value, show and stop up in the porous ceramics filter seriously that solidified considerable heavy metal ion in the sheet this moment, should change sheet and clean.Can use ultrasonic cleaning preferably.Clean porous ceramics filter aperture, back and connect well, the inner no residual solid impurity of pore can be recycled.
Be provided with multistagely when being the filter element of filter element with SiC porous ceramics filter, employed SiC porous ceramics filter bore diameter gradient is provided with, and reduces step by step.
During use, described wastewater of cleaning printed circuit board is placed settling tank, in the time of sedimentation, the filtration through multistorey strainer mesh obtains particles contained filtrate below 30 μ m successively; The SiC porous ceramics filter that is not more than 30 μ m through the aperture carries out the one-level depth-type filtration again; The one-level filtrate filtered is carried out the secondary depth-type filtration through the littler SiC porous ceramics filter in aperture again; Determine the progression of needs depth-type filtration according to actual conditions, until reaching discharge standard.
The present invention has following advantage with respect to existing technology:
Adopt physical filtering absorption but not the method for chemical reaction, not only to Cu
2+, Ni
2+, Pb
2+, Sn
2+Adsorption filtration effect etc. heavy metal ion is remarkable, and can not introduce other materials and cause secondary pollution; The preliminary treatment of Separation of Solid and Liquid and strainer filtering carry out simultaneously, have simplified technology, have saved floor space; Depth-type filtration device design multistage, multiple branch circuit had both guaranteed that operating efficiency had also guaranteed filter quality; Critical piece SiC ceramic filter has power of regeneration, and long service life has reduced production cost; The equipment that adopts is simple, easy to assemble, clean and maintenance, can also carry out the various combination of each assembly according to the difference of sewage composition, better reach the purpose of purifying waste water, water after handling is carried out the production reuse of enterprise, can be enterprise and save huge water rate spending, alleviate current water scarcity present situation.Cost is low generally, energy consumption is little, and is simple to operate, floor space is little, and applied range has good prospects for application and remarkable social benefit.
(4) description of drawings
(a) and (b) are respectively the pore distribution of shapes figure and the SEM figure on SiC porous ceramics filter surface in the embodiment of the invention 1 among Fig. 1;
Fig. 2 is a two-stage depth-type filtration apparatus structure schematic diagram in the embodiment of the invention 3.
(5) specific embodiment:
Below with specific embodiment technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
The preparation of embodiment 1 SiC porous ceramics filter
Adopt silicon carbide micro-powder, carbon dust, clay and the potassic feldspar of 100 μ m, in 45: 35: 12: 8 mass parts ratio wet-mixing, dry-pressing formed, promptly get described SiC porous ceramics filter at 1240 ℃ of sintering, the porosity is 65%, and average pore size is 30 μ m, and pore is solid netted distribution.
Embodiment 2
Adopt silicon carbide micro-powder, carbon dust, clay and the potassic feldspar of 10 μ m, in 40: 50: 6: 6 mass parts ratio wet-mixing, dry-pressing formed, promptly get described SiC porous ceramics filter at 1280 ℃ of sintering, the porosity is 60%, and average pore size is 5 μ m, and pore is solid netted distribution.
Embodiment 3:
The cleaning waste water of printed circuit board (PCB) factory, wherein the content of Ni, Cu, Pb element is respectively: 155ng/mL, 11410ng/mL, 1077ng/mL, PH are 10.The wastewater of cleaning printed circuit board treating apparatus that present embodiment adopts is: settling tank, settling tank is connected with 200 orders, 400 mesh filter screens on the wastewater treatment process thereafter, the aperture is respectively 74 μ m, 37 μ m, and being connected with the SiC porous ceramics filter that is solid netted distribution with pore afterwards is the one-level depth-type filtration device and the secondary depth-type filtration device of filter element; The aperture of SiC porous ceramics filter is 30 μ m (adopting the SiC porous ceramics filter of embodiment 1 preparation) in the one-level depth-type filtration device, in the secondary depth-type filtration device is 5 μ m (adopting the SiC porous ceramics filter of embodiment 2 preparations), SiC porous ceramics filter adopts carrier supported, the silica gel plate washer sealing, flange connects; All be provided with two branch roads in the I and II depth-type filtration device, each branch road all is provided with a filter element that contains SiC porous ceramics filter, and a high pressure back-blowing device is arranged.Elder generation through the settling tank sedimentation, plays preliminary Separation of Solid and Liquid with sewage; And then remove wherein size at the particle of 100～30 μ m with filter screen; Again by one-level depth-type filtration device; Pass through secondary depth-type filtration device thereafter; Content through Ni, Cu, Pb element in the filtrate after the secondary depth-type filtration is respectively after testing: 6.63ng/mL, 42.6ng/mL, 5.91ng/mL; PH is 8.The concrete discharge value of each index of first discharge standard is as follows among " integrated wastewater discharge standard " (the GB 8978-1996) of country: Ni
2+Be 1.0mg/L, Cu
2+Be 0.5mg/L, Pb
2+Be 1.0mg/L, PH is 6～9; After circuit board of the present invention cleans the Waste Water Treatment processing, clean waste water and reach discharge standard.
Embodiment 4:
The cleaning waste water of printed circuit board (PCB) factory, wherein the content of Ni, Cu, Pb element is respectively: 209ng/mL, 15223ng/mL, 1925ng/mL, PH are 10.The wastewater of cleaning printed circuit board treating apparatus that present embodiment adopts is: settling tank, wherein parallel 200 orders, 400 mesh filter screens of being equipped with, the aperture is respectively 74 μ m, 37 μ m, and it is the one-level depth-type filtration device and the secondary depth-type filtration device of filter element that settling tank is connected with the SiC porous ceramics filter that is solid netted distribution with pore thereafter on the wastewater treatment process; The aperture of SiC porous ceramics filter is 30 μ m (adopting the SiC porous ceramics filter of embodiment 1 preparation) in the one-level depth-type filtration device, in the secondary depth-type filtration device is 5 μ m (adopting the SiC porous ceramics filter of embodiment 2 preparations), SiC porous ceramics filter adopts carrier supported, the silica gel plate washer sealing, flange connects; All be provided with two branch roads in the I and II depth-type filtration device, each branch road all is provided with a filter element that contains SiC porous ceramics filter, and a high pressure back-blowing device is arranged.Elder generation through the settling tank sedimentation, plays preliminary Separation of Solid and Liquid with sewage; In sedimentation, make sewage obtain particles contained filtrate below 30 μ m through the filtration of filter screen successively; Again by one-level depth-type filtration device; Pass through secondary depth-type filtration device at last; Content through Ni, Cu, Pb element in the filtrate after the secondary depth-type filtration is respectively after testing: 7.41ng/mL, 43.1ng/mL, 5.91ng/mL; PH is 8.After circuit board of the present invention cleans the Waste Water Treatment processing, clean waste water and reach first discharge standard among " integrated wastewater discharge standard " (the GB 8978-1996) of discharging country.
Claims (8)
1. the processing method of a wastewater of cleaning printed circuit board, it is characterized in that described method carries out Separation of Solid and Liquid earlier for cleaning waste water, the particle that filters then in the control waste water is not more than 30 μ m, is filtered to the setting discharge standard by SiC porous ceramics filter more afterwards; The pore of described SiC porous ceramics filter is solid netted distribution, and the aperture of filter is 5 μ m.
2. the processing method of wastewater of cleaning printed circuit board as claimed in claim 1 is characterized in that being not more than 30 μ m by the particle in the strainer filtering control waste water.
3. the processing method of wastewater of cleaning printed circuit board as claimed in claim 2, it is characterized in that described strainer filtering and SiC porous ceramics filter filter carries out repeatedly respectively.
4. the processing method of wastewater of cleaning printed circuit board as claimed in claim 1, it is characterized in that described SiC porous ceramics filter is prepared in accordance with the following methods: adopt silicon carbide micro-powder, carbon dust, clay and potassic feldspar, in 40: 50: 6: 6 mass parts ratio wet-mixing, after dry-pressing formed, sintering promptly gets described SiC porous ceramics filter under 1200-1300 ℃ high temperature, described silicon carbide micro-powder particle diameter 10～100 μ m.
5. the treating apparatus of a wastewater of cleaning printed circuit board, it is characterized in that described device comprises equipment for separating liquid from solid, preliminary filter, depth-type filtration device, described preliminary filter is a filter element with filter screen or polymeric membrane, it is the filter element of filter element with SiC porous ceramics filter that the depth-type filtration device comprises multistage, and the progression of filter element is arranged so that filtering the back draining reaches established standards; The aperture of described SiC porous ceramics filter is 5 μ m, and pore is solid netted distribution.
6. the treating apparatus of wastewater of cleaning printed circuit board as claimed in claim 5 is characterized in that it is the filtration branch road of filter element with SiC porous ceramics filter that every grade of filter element is provided with arranged side by side.
7. as the treating apparatus of claim 5 or 6 described wastewater of cleaning printed circuit board, it is characterized in that every grade of filter element is provided with SiC porous ceramics filter blowback system.
8. the treating apparatus of wastewater of cleaning printed circuit board as claimed in claim 7 is characterized in that described equipment for separating liquid from solid is a settling tank, and described preliminary filter comprises multistorey strainer mesh, cleans waterwater entrance to the setting of outlet interbody spacer in settling tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101896929A CN101219304B (en) | 2007-10-09 | 2007-10-09 | Method and system for processing wastewater of cleaning printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101896929A CN101219304B (en) | 2007-10-09 | 2007-10-09 | Method and system for processing wastewater of cleaning printed circuit board |
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| Publication Number | Publication Date |
|---|---|
| CN101219304A CN101219304A (en) | 2008-07-16 |
| CN101219304B true CN101219304B (en) | 2011-05-04 |
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ID=39629547
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101896929A Expired - Fee Related CN101219304B (en) | 2007-10-09 | 2007-10-09 | Method and system for processing wastewater of cleaning printed circuit board |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102215636B (en) * | 2010-04-12 | 2012-12-19 | 富葵精密组件(深圳)有限公司 | Circuit board wet processing device |
| CN102115278A (en) * | 2010-12-30 | 2011-07-06 | 北大方正集团有限公司 | Method and device for treating waste liquid from circuit board preparation |
| CN103623701A (en) * | 2013-11-27 | 2014-03-12 | 杭州创享环境技术有限公司 | Technique of utilizing silicon carbide film instead of filter press in production and edulcoration of epoxy ester plasticizer |
| CN106532193A (en) * | 2016-11-30 | 2017-03-22 | 金华市潜龙新材料科技有限公司 | Water injection power generation camping lamp |
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Assignee: Huizhou Jinbaize Circuit Technology Co., Ltd. Assignor: Zhengzhou University Contract record no.: 2012440000146 Denomination of invention: Method and system for processing wastewater of cleaning printed circuit board Granted publication date: 20110504 License type: Exclusive License Open date: 20080716 Record date: 20120331 |
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Granted publication date: 20110504 Termination date: 20171009 |
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