CN100378014C - Sewage treating and resource recovering system - Google Patents
Sewage treating and resource recovering system Download PDFInfo
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- CN100378014C CN100378014C CNB2005100165664A CN200510016566A CN100378014C CN 100378014 C CN100378014 C CN 100378014C CN B2005100165664 A CNB2005100165664 A CN B2005100165664A CN 200510016566 A CN200510016566 A CN 200510016566A CN 100378014 C CN100378014 C CN 100378014C
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Abstract
The present invention relates to a sewage treating and resource recovering system which belongs to the sewage treating and resource recovering system and a method thereof. The sewage treating and resource recovering system comprises a displacing and recovery unit, a micro-electrolysis processing unit, a copper-sulfate recovery unit, an alkali recovery unit and a chemical coagulating unit. The present invention has the advantages that pollution is processed in a safe and energy-source saving mode, resource recovery benefit can be obtained, resources can be recovered and reutilized in the days when the resources are gradually decreased day by day, and the waste reducing process can not bring great obsession to users and investors, and needs not to be greatly changed.
Description
Technical field
The present invention relates to a kind of sewage disposal technology, the system and method that particularly a kind of sewage disposal and resource reclaim.
Background technology
As everyone knows, sewage disposal technology, branch trade generally is not divided into chemical treatment mode, biological treatment mode, or say one-level processing, second-stage treatment and tertiary treatment, traditional mode often causes the bigger pollution of environment or needs more cost just can reach, and has formed the more environmental problems and the wasting of resources; In addition, the processing of traditional way more causes great cost burden of investor and risk, but can not get any repayment, is reluctant prevention and cure of pollution cost with single-hearted devotion to such an extent as to be absorbed in, and is absorbed in the vicious cycle of contaminate environment;
Traditional sewage disposal mode often must rely on and spend more multipotency source and more chemical agent and handle pollution problem, promptly uses a kind of pollutent to remove to handle another kind of pollutent, and callable resource is become waste abandons; Like this except expending a large amount of energy, more with recyclable resource manufacturing or be converted into solid waste, cause another kind of the pollution once again, be badly in need of being improved.
Summary of the invention
According to purpose of the present invention, shortcoming at existing Sewage treatment systems existence, the system and method that provides a kind of sewage disposal and resource to reclaim, this system comprises a displacement recovery unit, it has an aluminium is recovering medium, is a settling and a category-B waste liquid in order to replace and to produce a bronze medal with a category-A waste liquid; One little electrolysis treatment unit, it has a filter bed, in order to a current potential to be provided, the chemical oxygen demand (COD) in this category-B waste liquid to be removed, and produced an E class waste liquid; One copper sulfate reclaims the unit, with so that in the C class waste liquid copper sulfate compound carry out the freezing and crystallizing recovery, and produce 5 brochantite crystallizations and a spent acid is recycled; One alkalescence reclaims the unit, and it has an alkaline sand tower, in order to filter the copper hydroxide glue plumage fine particle in the D class waste liquid; One active carbon filtration portion is connected in this alkalescence sand tower, adds sodium hydroxide again, reaches more than 9 in order to adjust pH value, and then forms the tiny glue plumage of a copper hydroxide; B, filter the tiny glue plumage of this copper hydroxide, a clear liquor of gained adds sulfuric acid H thereafter again
2SO
4, adjust pH value to 6～8; C, carry out a RO reverse osmosis and handle, so that this clear liquor produces a required pure water and the pure water sewage of a high rigidity.
As for to E class liquid waste disposal, when every E class sewage produces source (E1, E2, E4) after mixing, promptly carrying out chemical coagulation handles, at first add aluminum chloride and carry out coagulation, this aluminum chloride produces in the A1 treatment scheme, utilizes NaOH to adjust pH value to 6～8 again, adds at last to precipitate after coagulant aids forms big glue plumage, the mud that is produced in settling tank will be handled in the A1 system at last, and upper clear liquid will enter comprehensive pond and can discharge after mixing with the E3 water system.
But F1 and F2 in the last F class waste liquid have the close processing mode that is not quite similar, and wherein F1 can entrust and handle or transfer to material supply merchant recovery; F2 then can transfer to manufacturer's processing if there is generation to handle manufacturer, otherwise need include the B4 system handles in.
Generally, the invention provides a kind of sewage disposal and its recovery method as resource that is applied to the printed circuit board (PCB) processing procedure, its step comprises at least: a, the waste liquid that each processing procedure is produced are divided into a category-A waste liquid, a category-B waste liquid, a C class waste liquid, a D class waste liquid, an E class waste liquid, a F class waste liquid; B, this category-A waste liquid is added an aluminium is recovering medium, is settling and this category-B waste liquid in order to replace and to produce a bronze medal with this category-A waste liquid; C, this category-B waste liquid is carried out a little electrolysis treatment, removing the chemical oxygen demand (COD) in this category-B waste liquid, and produce this E class waste liquid; D, C class waste liquid is imported a copper sulfate reclaim machine, with so that this C class waste liquid produces one 5 brochantite crystallizations and a spent acid to be recycled; E, D class waste liquid is imported an alkaline sand tower, in order to filter the copper hydroxide glue plumage fine particle in this D class waste liquid; And again with an active carbon filtration portion, in order to make this D class waste liquid become a pure water again and to be recycled; F, in E class waste liquid, add a chemical coagulator, with so that this E class waste liquid produces a glue feather-like precipitate and this category-A waste liquid; G, this F class waste liquid of sorting to form this category-B waste liquid, are handled to include step c in.
Be recycled in order to make this D class waste liquid become pure water again; And a chemical coagulating and recovering unit, its tool one chemical coagulator is with so that this E class waste liquid produces a glue feather-like precipitate and this category-A waste liquid; Wherein, said aluminium is that recovering medium is an aluminium powder or aluminium flake; Said filter bed is by an iron powder and an activated carbon powder, is constituted with each ratio of 50%; Said category-A waste liquid is the waste liquid of a replaceable recovery, and it can be an A1 waste cuprous chloride solution, an A2 chemical copper waste liquid, an A3EDTA waste liquid or its mixing; Said category-B waste liquid more comprises a B1 striping development waste liquid, a B2 potassium permanganate waste liquid, a B3 nitric acid waste, other waste liquids of a B4, a B5 acidifying waste liquid or its mixing; Said C class waste liquid is the waste liquid of a copper sulfate, and it can be a C1 micro-etched waste liquid, a C2 copper facing waste liquid or its mixed liquid and closes liquid; Said D class waste liquid is the washing water of printed circuit board (PCB) wet process equipment discharging; Said E class waste liquid is sewage, other waste liquids of E4 or its mixed solution that produces for an E1 processing procedure drainage water wash water, an E2 filtering system backwash water, an E3RO film;
This sewage disposal and resource recovering system also comprise an otherwise processed unit, in order to a F class waste liquid sorting, produce the category-B waste liquid, to include this micro computer electrolysis processing unit in; Wherein F class waste liquid is to be a F1 alkaline etching waste liquid for producing, a F2 tin-lead soldering waste liquid or its mixed solution.
The invention has the advantages that: use a kind of mode safe and the saving energy to handle pollution, can also therefrom obtain the benefit that resource reclaims, and can be in resource day by day rare today, reach the purpose of resource recycling, and in subtracting useless process, can't give user and the too big puzzlement of investor, also change that need be not too much.
Description of drawings:
Fig. 1 block flow diagram of the present invention.
Embodiment:
As shown in Figure 1, the present invention mainly comprises a displacement at least and reclaims unit 1, and it has an aluminium is recovering medium 12, is a settling 13 and a category-B waste liquid 21 in order to replace and to produce a bronze medal with a category-A waste liquid 11; One little electrolysis treatment unit 2, it has a filter bed 22, in order to a current potential to be provided, the chemical oxygen demand (COD) in this category-B waste liquid 21 to be removed, and produced an E class waste liquid 51; One copper sulfate reclaims unit 3, with so that in the C class waste liquid 31 a copper sulfate compound carry out the freezing and crystallizing recovery, and produce 5 brochantite crystallizations 32 and a spent acid 33 is recycled; One alkalescence reclaims unit 4, and it has an alkaline sand tower 42, in order to filter the copper hydroxide glue plumage fine particle 45 in the D class waste liquid 41; One active carbon filtration portion 43 is connected in this alkalescence sand tower 42, is recycled in order to make this D class waste liquid 41 become pure water 44 again; And a chemical coagulating and recovering unit 5, its tool one chemical coagulator 52 is with so that this E class waste liquid 51 produces a glue feather-like precipitate 53 and this category-A waste liquids 11; This sewage disposal and resource recovering system also comprise an otherwise processed unit 6, in order to a F class waste liquid 61 sortings, produce this category-B waste liquid 21, to include this little electrolysis treatment unit 2 in.
For describing various waste liquid classification of the present invention in detail, see also following table:
| Classification | Classifying and numbering | Specific name | The processing procedure source | Remarks |
| A | A1 | Waste |
1, internal layer etching machine etching section (DES) 2, outer acid etching machine etching section (DES) | If there have the outer acid etching machine of use then to need to be included with its waste liquid |
| A2 | The chemical copper waste liquid | The chemical copper groove waste liquid of plated-through-hole processing procedure (PTH) | This waste liquid belongs to periodic replacement discharging regularly | |
| A3 | The EDTA waste liquid | The chemical copper waste liquid produces behind replacement process | ||
| B | B1 | The striping |
1, develop section and striping section (DES) 3, anti-welding procedue developing machine develop |
This waste liquid belongs to periodic replacement discharging regularly |
| B2 | The potassium permanganate waste liquid | The waste liquid that plated-through-hole processing procedure (PTH) de-smear section is produced | This waste liquid belongs to periodic replacement discharging regularly | |
| B3 | |
1, coppered wire is cut hanger |
This waste liquid belongs to periodic replacement discharging regularly |
| B4 | |
1, black, the effluent discharge completely of brown line, but the C1 waste liquid must foreclose 2, the effluent discharge completely of ENTEK line, but the C1 waste liquid must foreclose 3, a coppered wire all |
This waste liquid belongs to periodic replacement discharging regularly | |
| B5 | The acidifying waste liquid | It stems from |
||
| C | C1 | |
1, the dioxysulfate water (H of each horizontal processing procedure pre-processing device
2SO
4-H
2O
2) the dioxysulfate water (H that produced of |
If use Sodium Persulfate (SPS), need that then its waste liquid is introduced this waste liquid of B4 and belong to periodic replacement discharging regularly |
| C2 | The copper facing |
1, the |
This waste liquid belongs to periodic replacement discharging regularly | |
| D | D | Each processing procedure washing water | Be meant except that the washing water (rinse water) that plated-through-hole processing procedure (PTH) and outer alkaline etching machine (SES) are produced the washing water of all wet process equipments dischargings at this | This waste water is continuous blow-down |
| E | E1 | Processing procedure drainage water wash |
1, the washing water (rinse water) 2 that produced of plated-through-hole processing procedure (PTH), the washing water (rinse water) that outer alkaline etching machine (SES) is produced | This waste water is continuous blow-down |
| E2 | The filtering system backwash |
1, be in the sewage process handling D, need to use sand filtration and active carbon filtration, its anti-cleaning (back washing) water need enter this system handles 2, when back segment mixes bed and handle to make ultrapure water, the spent acid solution and the waste lye that are produced because of regeneration | This waste liquid belongs to periodic replacement discharging regularly | |
| E3 | The sewage that the RO film produces | Handling D is in the sewage process, needs to use the RO reverse osmosis membrane to produce pure water, can produce the higher sewage of hardness in process, need enter this system handles, or reclaims as anti-(back washing) water that cleans again | This waste water is continuous blow-down | |
| E4 | Other waste liquids | Its source form is in B4, and must be after acidified and little electrolysis pretreatment, quantitatively and the E1 combination treatment | ||
| F | F1 | Alkaline etching waste liquid for producing | Outer alkaline etching machine etching section (SES) | This waste liquid belongs to the regular discharging of periodic replacement and advises entrusting and handle or transfer to material supply merchant recovery |
| F2 | The tin-lead soldering waste liquid | Outer alkaline etching machine tin-lead soldering section (SES) | This waste liquid belongs to regular the discharging if there is generation to handle manufacturer's processing of periodic replacement then can transfer to manufacturer's processing, otherwise need include the B4 system handles in |
At above-mentioned various waste liquid, sewage disposal provided by the invention and resource recovering system can following method be reached the effect of improving processing;
At first, when handling at the A1 water system in the category-A waste liquid, its method is after collecting waste cuprous chloride solution earlier, mix again with because of wastewater sludge that sewage disposal produced, become cupric chloride (because of containing hydrochloric acid in the waste cuprous chloride solution) in order to the cupric ion in the dissolving mud, original sludge volume will reduce approximately 70% this moment, earlier through fs sludge dewatering, transfer to qualified offal treatment after the sludge dewatering with copper ions not and will clear manufacturer's processing; Can carry out replacement(metathesis)reaction through blended waste cuprous chloride solution again this moment, get factory's internal cause boring aluminium scrap sheet that processing procedure produced earlier and carry out fragmentation or pulverizing, after waste cuprous chloride solution is inserted a treatment trough, aluminium powder or aluminium flake input wherein can be carried out replacement(metathesis)reaction, about 1～4 hour of time swap, during this time, the operator can inject air and stir and cool off, finish the reaction back and after dehydration, can get copper powder mud again in getting a considerable amount of copper powders under the bottom land, and upper clear liquid is aluminum chloride, required coagulating agent when this can be used as wastewater treatment can reduce the sewage running cost.
When handling at the A2 water system in the category-A waste liquid, then the chemical copper waste liquid is dropped in the replacement(metathesis)reaction groove, getting the factory internal cause boring aluminium scrap sheet that processing procedure produced this moment carries out fragmentation or pulverizes dropping into reactive tank and carrying out replacement(metathesis)reaction, about 1～2 hour of time, during, the operator can inject air and stir and cool off, finish the reaction back and under bottom land, can get a considerable amount of copper powders, its clear liquor then is EDTA-A1, and copper powder can be obtained after filtering, and clear liquor then need import the B4 water system and handle;
During at the category-B liquid waste disposal, the B1 water system is handled can be according to wastewater treatment earlier through acidifying, promptly drop in the acidification reaction groove and to add sulfuric acid the pH value is adjusted to 2～3, have many viscosity scum silica frost and produce this moment, through the scum silica frost filtering or drag for and to clarify acidifying waste liquid B5 after removing and drop in the acidifying storage tanks, quantitatively add again in the B4 water system storage tanks and mix; Quantitatively add again in the B4 water system storage tanks after B2 and B3 water system are handled and then collected and mix; B4 then mixes with the B5 that quantitatively enters, B2, B3 water system in collecting the back, enters little electrolytic system thereafter and handles;
Is an open filter bed and this little electrolytic system utilizes iron powder and activated carbon powder respectively to account for 50% mixed, when filtering waste liquid, its current potential heavy metal in the waste liquid and COD can be carried out oxygenizement so that reach remove COD and with water in heavy metal carry out the effect of coagulation in advance, after the quantitative mixing of category-B waste liquid, if through little electrolysis treatment, and the waste liquid residence time reaches 36～48 hours, then the COD clearance can reach more than 60%, and this effect can effectively reduce the load and the cost of subsequent chemistry treatment scheme; The little electrolysis waste solution E4 that handles will enter in the storage tanks, quantitatively with after E class sewage mixes carry out chemical treatment;
Add sodium hydroxide again, reach more than 9 in order to adjust pH value, and then form the tiny glue plumage of a copper hydroxide; B, filter the tiny glue plumage of this copper hydroxide, a clear liquor of gained adds sulfuric acid H thereafter again
2SO
4, adjust pH value to 6～8; C, carry out a RO reverse osmosis and handle, so that this clear liquor produces a required pure water and the pure water sewage of a high rigidity.
As for to E class liquid waste disposal, when every E class sewage produces source (E1, E2, E4) after mixing, promptly carrying out chemical coagulation handles, at first add aluminum chloride and carry out coagulation, this aluminum chloride produces in the A1 treatment scheme, utilizes NaOH to adjust pH value to 6～8 again, adds at last to precipitate after coagulant aids forms big glue plumage, the mud that is produced in settling tank will be handled in the A1 system at last, and upper clear liquid will enter comprehensive pond and can discharge after mixing with the E3 water system.
But F1 and F2 in the last F class waste liquid have the close processing mode that is not quite similar, and wherein F1 can entrust and handle or transfer to material supply merchant recovery; F2 then can transfer to manufacturer's processing if there is generation to handle manufacturer, otherwise need include the B4 system handles in.
Generally, the invention provides a kind of sewage disposal and its recovery method as resource that is applied to the printed circuit board (PCB) processing procedure, its step comprises at least: a, the waste liquid that each processing procedure is produced are divided into a category-A waste liquid, a category-B waste liquid, a C class waste liquid, a D class waste liquid, an E class waste liquid, a F class waste liquid; B, this category-A waste liquid is added an aluminium is recovering medium, is settling and this category-B waste liquid in order to replace and to produce a bronze medal with this category-A waste liquid; C, this category-B waste liquid is carried out a little electrolysis treatment, removing the chemical oxygen demand (COD) in this category-B waste liquid, and produce this E class waste liquid; D, C class waste liquid is imported a copper sulfate reclaim machine, with so that this C class waste liquid produces one 5 brochantite crystallizations and a spent acid to be recycled; E, D class waste liquid is imported an alkaline sand tower, in order to filter the copper hydroxide glue plumage fine particle in this D class waste liquid; And again with an active carbon filtration portion, in order to make this D class waste liquid become a pure water again and to be recycled; F, in E class waste liquid, add a chemical coagulator, with so that this E class waste liquid produces a glue feather-like precipitate and this category-A waste liquid; G, this F class waste liquid of sorting to form this category-B waste liquid, are handled to include step c in.
Claims (8)
1. sewage disposal and resource recovering system is characterized in that: include:
The unit is reclaimed in one displacement, and it has an aluminium is recovering medium, and replacing and produce a bronze medal with a category-A waste liquid is a settling and a category-B waste liquid;
One little electrolysis treatment unit, it has a filter bed, in order to a current potential to be provided, the chemical oxygen demand (COD) in this category-B waste liquid to be removed, and produced an E class waste liquid;
One copper sulfate reclaims the unit, makes in the C class waste liquid copper sulfate compound carry out freezing and crystallizing and reclaims, and produce 5 brochantite crystallizations and a spent acid;
One alkalescence reclaims the unit, and it has an alkaline sand tower, filters the copper hydroxide glue plumage fine particle in the D class waste liquid;
One active carbon filtration portion is connected in this alkalescence sand tower, makes this D class waste liquid become pure water;
One chemical coagulating and recovering unit, its tool one chemical coagulator makes this E class waste liquid produce a glue feather-like precipitate and this category-A waste liquid;
And an otherwise processed unit, with a F class waste liquid sorting, produce the category-B waste liquid, to include this little electrolysis treatment unit in.
2. the sewage disposal of a printed circuit board (PCB) processing procedure and resource recycling method, it is characterized in that: its step comprises:
A, the waste liquid that each processing procedure is produced are divided into a category-A waste liquid, a category-B waste liquid, a C class waste liquid, a D class waste liquid, an E class waste liquid, a F class waste liquid;
B, this category-A waste liquid is added an aluminium is recovering medium, is settling and this category-B waste liquid in order to replace and to produce a bronze medal with this category-A waste liquid;
C, this category-B waste liquid is carried out a little electrolysis treatment, removing the chemical oxygen demand (COD) in this category-B waste liquid, and produce this E class waste liquid;
D, C class waste liquid is imported a copper sulfate reclaim machine, with so that this C class waste liquid produces one 5 brochantite crystallizations and a spent acid to be recycled;
E, D class waste liquid is imported an alkaline sand tower, in order to filter the copper hydroxide glue plumage fine particle in this D class waste liquid; And again with an active carbon filtration portion, in order to make this D class waste liquid become a pure water again and to be recycled:
F, in E class waste liquid, add a chemical coagulator, with so that this E class waste liquid produces a glue feather-like precipitate and this category-A waste liquid;
G, this F class waste liquid of sorting to form this category-B waste liquid, are handled to include step c in.
3. the sewage disposal of printed circuit board (PCB) processing procedure according to claim 2 and resource recycling method, it is characterized in that: said category-A waste liquid is the waste liquid of a replaceable recovery, and it is an A1 waste cuprous chloride solution, an A2 chemical copper waste liquid, an A3EDTA waste liquid or its mixed solution.
4. the sewage disposal of printed circuit board (PCB) processing procedure according to claim 2 and resource recycling method is characterized in that: said category-B waste liquid comprises a B1 striping development waste liquid, a B2 potassium permanganate waste liquid, a B3 nitric acid waste, other waste liquids of a B4, a B5 acidifying waste liquid or its mixed solution.
5. the sewage disposal of printed circuit board (PCB) processing procedure according to claim 2 and resource recycling method is characterized in that: said C class waste liquid is the waste liquid of a copper sulfate, and it is a C1 micro-etched waste liquid, a C2 copper facing waste liquid or its mixed solution.
6. the sewage disposal of printed circuit board (PCB) processing procedure according to claim 2 and resource recycling method is characterized in that: said D class waste liquid is the washing water of printed circuit board (PCB) wet process equipment discharging.
7. the sewage disposal of printed circuit board (PCB) processing procedure according to claim 2 and resource recycling method is characterized in that: said E class waste liquid is sewage, other waste liquids of E4 or its mixed solution of an E1 processing procedure drainage water wash water, an E2 filtering system backwash water, E3RO film generation.
8. the sewage disposal of printed circuit board (PCB) processing procedure according to claim 2 and resource recycling method is characterized in that: said F class waste liquid is a F1 alkaline etching waste liquid for producing, a F2 tin-lead soldering waste liquid or its mixed solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100165664A CN100378014C (en) | 2005-02-03 | 2005-02-03 | Sewage treating and resource recovering system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100165664A CN100378014C (en) | 2005-02-03 | 2005-02-03 | Sewage treating and resource recovering system |
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|---|---|
| CN1673126A CN1673126A (en) | 2005-09-28 |
| CN100378014C true CN100378014C (en) | 2008-04-02 |
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| CNB2005100165664A Expired - Fee Related CN100378014C (en) | 2005-02-03 | 2005-02-03 | Sewage treating and resource recovering system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1323951C (en) * | 2005-12-05 | 2007-07-04 | 毕天庆 | Sewage separation equipment |
| CN101565255B (en) * | 2009-05-11 | 2011-10-26 | 苏存章 | Treatment and reuse technology for aluminum surface treatment wastewater |
| CN110357321A (en) * | 2018-04-10 | 2019-10-22 | 华东理工大学 | A method of extracting sylvite from waste water |
| CN115367907B (en) * | 2022-07-07 | 2023-04-25 | 深圳瑞赛环保科技有限公司 | Comprehensive treatment method for various waste liquid of PCB |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280887A (en) * | 1979-04-30 | 1981-07-28 | Siemens Aktiengesellschaft | Method of regenerating ammoniacal etching solutions useful for etching metallic copper |
| US4802993A (en) * | 1984-07-13 | 1989-02-07 | Hitachi, Ltd. | Method of treating liquid wastes containing heavy metal chelate compounds |
| CN1082511A (en) * | 1992-06-02 | 1994-02-23 | 日立化成工业株式会社 | Handle the method and apparatus of copper chloride etching waste liquid |
| CN1299784A (en) * | 2001-02-02 | 2001-06-20 | 华南理工大学 | Treatment method of copper containing waste liquid from alkali etching of printed circuit board |
| JP2002248480A (en) * | 2001-02-26 | 2002-09-03 | Yasuya Mikami | Method for treating copper-containing waste acid |
-
2005
- 2005-02-03 CN CNB2005100165664A patent/CN100378014C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4280887A (en) * | 1979-04-30 | 1981-07-28 | Siemens Aktiengesellschaft | Method of regenerating ammoniacal etching solutions useful for etching metallic copper |
| US4802993A (en) * | 1984-07-13 | 1989-02-07 | Hitachi, Ltd. | Method of treating liquid wastes containing heavy metal chelate compounds |
| CN1082511A (en) * | 1992-06-02 | 1994-02-23 | 日立化成工业株式会社 | Handle the method and apparatus of copper chloride etching waste liquid |
| CN1299784A (en) * | 2001-02-02 | 2001-06-20 | 华南理工大学 | Treatment method of copper containing waste liquid from alkali etching of printed circuit board |
| JP2002248480A (en) * | 2001-02-26 | 2002-09-03 | Yasuya Mikami | Method for treating copper-containing waste acid |
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| CN1673126A (en) | 2005-09-28 |
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