CN105541055A - Treatment system for removing tin in PCB industrial wastewater - Google Patents
Treatment system for removing tin in PCB industrial wastewater Download PDFInfo
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- CN105541055A CN105541055A CN201610119577.3A CN201610119577A CN105541055A CN 105541055 A CN105541055 A CN 105541055A CN 201610119577 A CN201610119577 A CN 201610119577A CN 105541055 A CN105541055 A CN 105541055A
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- lalgine
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
Abstract
The invention discloses a treatment system for removing tin in PCB industrial wastewater. The treatment system comprises a water collecting well, a coarse screen, a primary sedimentation tank, a pH value adjusting tank, an alginic acid-biological catalytic adsorption purification system, an aeration and nitrification tank, a biological denitrification tank, a secondary sedimentation tank and a water purifying tank. The system creatively uses rolling adsorption brushes with alginic acid and sargassum thunbergii attached as a selective contact reaction medium, when tin ions in the wastewater are fully contacted with the rolling adsorption brushes, hydroxyl groups, carboxyl groups and amide groups on alginic acid and sargassum thunbergii molecular chains can have complexation reactions with the tin ions selectively, the tin in the wastewater is efficiently adsorbed by the sargassum thunbergii, and sargassum thunbergii residues after the adsorption reaction are brushed away by fixed brushes and settle naturally to gradually form sludge substances, so that the tin ions in the wastewater are removed. Meanwhile, the materials, namely, alginic acid and sargassum thunbergii, used by the system are substances which are low in cost and easy to obtain.
Description
Technical field
The present invention relates to a kind for the treatment of system removing tin in PCB trade effluent, belong to the field of waste water treatment in environment protection.
Background technology
In recent years, along with the develop rapidly of electronic information industry, demand and the output of printed circuit board (PCB) (PCB) significantly increase.The printed circuit board (PCB) output value of China has occupied more than 25% of the global gross output value, becomes world-class printed circuit board (PCB) manufacture base.But consequent stanniferous waste water pollution problem also becomes day by day serious, except the stanniferous waste liquid of the valuable high density of part reclaims except company's recovery by specialty, a large amount of waste water containing lower concentration tin need process qualified discharge.Therefore, the challenge that effective process has become enterprise is carried out to the stanniferous waste water of printed circuit board industry.
Extensive and serious harm can be produced to ecotope and the mankind, so become more and more important to the research of plating wastewater treatment technology because plating wastewater enters water body.Reusing sewage is carried out to the stanniferous waste water of printed circuit board (PCB) and metallic tin reclaims, can not only saving water resource, protection water surrounding, and reclaim the problem that the metallic tin obtained effectively can also solve metals resources shortage, reach the target that economic benefit and environmental benefit are taken into account.
Because plating wastewater generation node is many, and composition is more complicated, the method of therefore administering its waste water at present mainly contains two large classes, i.e. physico-chemical processes and biological process, mainly comprises coagulating sedimentation, ion-exchange, By Bubble-floating Method, absorption method, Fe-C Micro Electrolysis Method, catalytic oxidation, biological degradation method and combination treatment method etc.
(1) Coagulation Method.In printed circuit board (PCB) production process, organic waste water and the heavy metal wastewater thereby of some high densitys can be produced.For the waste water that this water quality is comparatively complicated, coagulating effectively can remove the colloidal solid etc. in waste water, can also form the precipitation of insoluble with the organism be dissolved in aqueous phase.Conventional coagulating agent comprises inorganic coagulant and organic coagulants two large class, wherein inorganic coagulant mainly FeCl
3, Al
2(SO
4)
3and polymkeric substance.Organic coagulants comprises cation high molecular coagulating agent, both sexes organic polymer coagulating agent, anionic high-molecular coagulant adopting and non-ionic type coagulating agent.
(2) ion exchange method carries out chelating, permutoid reaction by the amino isoreactivity group in resin and heavy metal ion, thus remove the method for heavy metal ions in wastewater.Conventional ion exchange resin has Zeo-karb, anionite-exchange resin, resin and Humic Acid Resin.
(3) By Bubble-floating Method.By Bubble-floating Method passes into air in waste water, and separate out from water with micro-bubble form and become carrier, the pollution substances such as the oil in water emulsion in waste water, small suspended particle are made to stick on bubble, the water surface is floated to bubble, formed foam-gas, water, particle (oil) three-phase mixture, by collection foam or scum silica frost with the object reaching separating impurity, purify liquid waste.
(4) absorption method.Absorption method utilizes porous solid sorbent treatment pollutent, and one or more components in pollutent, under the effect of molecular attraction or chemical bond, are attracted to solid surface, thus reach the object of separation.Conventional sorbent material has gac, humic acid, sepiolite, polysaccharide resins etc.
(5) Fe-C Micro Electrolysis Method.The electrolysis material of rail carbon micro-electrolytic processes generally adopts cast iron filing and gac or coke, when material is immersed in waste water, the electrolytic reaction of inside and outside two aspects occurs.The product that electrode reaction is produced has very high activity, can with various ingredients generation redox reaction in waste water, and many difficult for biological degradation and poisonous material can both be degraded effectively; Simultaneously metal can come iron with metal activity series in waste water after heavy metal ion generation replacement(metathesis)reaction.Iron-carbon micro-electrolysis is exactly reach by these effects the object removing water pollutant.
(6) catalytic oxidation.Catalyzed oxidation refers under certain pressure and temperature condition, and with metallic substance Pt, Pd, Ni etc. for catalyzer, the oxidizing reaction of carrying out for oxygenant with air, oxygen, ozone etc., comprises the effect of oxygenation and dehydrogenation two aspect.Utilize the decomposition of oxidation reinforced dose of catalyzed oxidation to accelerate the chemical reaction between Pollutants in Wastewater and oxygenant, remove the pollutent in water.
(7) biological process and combination treatment method.Biological degradation method, the mud mainly utilizing sewage work to return or natural microbial process PCB waste water.Biological process is not high to the clearance of high density PCB waste water, and degraded is not thorough, thus needs to set up chemical treatment to make up above-mentioned deficiency, namely administers plating wastewater with the treatment process of biological-chemical associating.So adopt biological process and additive method combined treatment board wastewater more and more concerned, that has reported has coagulation-contact oxidation method, reverse osmosis-electrodeionization (RO-EDI) desalination system, Production Wastewater By Combined Acidification And Demulsification-iron-carbon micro-electrolysis-neutralization precipitation-SBR combination process etc.
The routine maintenance of conventional physical method as filtered, required for adsorption method of separation costly, the little and secondary pollution problems for the treatment of capacity.It is very complicated that the main drawback of biological process is that the complicacy of microorganism structure determines the mechanism of microbiological treatment plating wastewater, and the treatment time is long, it is large, unstable etc. to be affected by the external environment.Therefore, be necessary to break away from existing treatment technology thinking, hew out the new way removing PCB heavy metals in industrial wastewater, and then develop a kind for the treatment of technology of PCB heavy metals in industrial wastewater of new type.
Summary of the invention
For solving the deficiencies in the prior art, the invention provides a kind for the treatment of system removing tin in PCB trade effluent, this system comprises pump well, coarse rack, primary sedimentation basin, pH value equalizing tank, Lalgine-biocatalysis adsorption cleaning system, aeration nitrification tank, biological denitrificaion pond, secondary sedimentation basins, water purifying tank etc., wherein, stanniferous PCB trade effluent enters pump well by waste line, centralized collection and preliminarily stabilised adjustment is carried out at this, the outlet of pump well connects coarse rack by waste line, the major diameter solid matter in trade effluent is removed at this, the outlet of coarse rack connects primary sedimentation basin by waste line, the insoluble substance in waste water is removed further at this, the outlet of primary sedimentation basin connects pH value equalizing tank by waste line, waste water carries out neutralizing treatment at this and carries out the fine adjustment of pH value, the pH value range of pH value equalizing tank water outlet is 5.0 ~ 6.5, the requirement of water pH value is entered with what meet Lalgine-biocatalysis adsorption cleaning system, the outlet of pH value equalizing tank connects Lalgine-biocatalysis adsorption cleaning system by waste line, the sludge material outward transport process that Lalgine-biocatalysis adsorption cleaning system is discharged, simultaneously, the outlet of Lalgine-biocatalysis adsorption cleaning system connects aeration nitrification tank by waste line, at this by aerobic aeration process, the various nitrogenous substancess in waste water are made all to be converted into nitrate nitrogen, the outlet of aeration nitrification tank connects biological denitrificaion pond by waste line, its effect is by biological activity reaction process, by the nitrate nitrogen decomposition and inversion in waste water, thus removal nitrate nitrogen, the outlet in biological denitrificaion pond is by waste line connecting secondary settling tank, at this, residue insoluble substance in waste water is all removed, the outlet of secondary sedimentation basins connects water purifying tank by waste line, purification water outlet after native system process is arranged outward by waste line by the outlet of water purifying tank, wherein, the pond body of Lalgine-biocatalysis adsorption cleaning system adopts glass reinforced plastic material, on the left of the body of pond, inlet valve and flexible mud pusher are equipped with in below, flowing water Valve is equipped with in top, right side, and lower right-hand side is provided with mud row mouth, and light Steel Bracket is equipped with on body top, pond, it is fixed with 3 groups of totally 9 atomizers, be fixed with 3 covers rolling absorption in the middle part of the body of pond to brush, often cover rolls to adsorb on the left of brush and is provided with 1 stationary brush, adsorbs to brush fit with rolling, the PCB trade effluent of (after process, pH value is 5.0 ~ 6.5) after process is regulated to enter purification system by the inlet valve of below on the left of Lalgine-biocatalysis adsorption cleaning system through pH value, 3 covers be positioned in the middle part of the body of pond roll to adsorb to brush and start to roll clockwise, on it, the Lalgine of attachment fully contacts with the tin ion in waste water with sargassum thunbergii, by the hydroxyl on Lalgine and sargassum thunbergii molecular chain, carboxyl, amide group optionally with tin ion generation complex reaction, make tin in waste water by sargassum thunbergii efficient adsorption, by stationary brush the sargassum thunbergii residue after absorption reaction brushed afterwards and make it bottom natural subsidence to pond, form sludge material gradually, after promoted by flexible mud pusher, pond body is discharged through mud row mouth, simultaneously, brush clean rolling bristle through stationary brush to continue to do more than clockwise movement to the water surface, again Lalgine-sargassum thunbergii mixed solution is sprayed by atomizer, make rolling adsorb brush to be regenerated, again enter in water through clockwise movement path, start new absorption reaction process, wherein the effect of pH value equalizing tank is that the waste water ph through primary sedimentation is adjusted to 5.0 ~ 6.5, enters the requirement of water pH value with what meet Lalgine-biocatalysis adsorption cleaning system, wherein, the effect of aeration nitrification tank is by aerobic aeration process, makes the various nitrogenous substancess in waste water all be converted into nitrate nitrogen, wherein, the effect in biological denitrificaion pond is by biological activity reaction process, by the nitrate nitrogen decomposition and inversion in waste water, thus removes nitrate nitrogen.
The pond body useful volume of its Lalgine-biocatalysis adsorption cleaning system is 225m
3, its roll absorption brush brush long 4.5m, the long 10cm of bristle, the operating voltage of its drive-motor is 380V, and swing circle is 260s.
In Lalgine-sargassum thunbergii mixed solution, the mass concentration of Lalgine and sargassum thunbergii is respectively 85.0mg/L and 5.5g/L.
The invention has the advantages that:
(1) native system has broken away from the inherent technology route of existing PCB Industrial Wastewater Treatment, creationary sargassum thunbergii and the Lalgine of make use of is to metal ion, especially the adsorption selection characteristic of tin ion, efficient complex reaction is there is by the tin ion in hydroxyl, carboxyl, amide group and the waste water on sargassum thunbergii and Lalgine molecular chain, can give play to significant adsorption cleaning effect for stanniferous waste water, its tin ion removal efficiency can reach 99.2%.
(2) compared with the method for the stanniferous waste water of existing process, the best of native system is suitable for pH value range comparatively extensively, and only simply need enter water pH value regulating measure, what just can reach system easily enters the requirement of water pH value.
(3) native system make use of the not only common but also cheap sea-food of Lalgine and sargassum thunbergii these two kinds, greatly reduces operating Material Cost, is highly suitable for coastal economy and industrial comparatively developed regions is promoted the use of.
(4) native system have employed the means that Lalgine and sargassum thunbergii adsorb tin ion in waste water, does not use any toxic chemical substance, thus eliminates the risk introducing new, that harm is larger pollutent.
Accompanying drawing explanation
Fig. 1 is equipment schematic diagram of the present invention.
In figure: 1-pump well, 2-coarse rack, 3-primary sedimentation basin, 4-pH value equalizing tank, 5-Lalgine-biocatalysis adsorption cleaning system, 6-aeration nitrification tank, 7-biological denitrificaion pond, 8-secondary sedimentation basins, 9-water purifying tank
Fig. 2 is the schematic diagram of Lalgine-biocatalysis adsorption cleaning system.
Brush is adsorbed in 51-glass reinforced plastic pond body, the light Steel Bracket of 52-, 53-atomizer, 54-rolling, 55-stationary brush, 56-inlet valve, 57-flowing water Valve, 58-mud arrange mouth, 59-stretches mud pusher.
Embodiment
The treatment system of removal heavy metals in industrial wastewater as shown in Figure 1, this system comprises pump well 1, coarse rack 2, primary sedimentation basin 3, pH value equalizing tank 4, Lalgine-biocatalysis adsorption cleaning system 5, aeration nitrification tank 6, biological denitrificaion pond 7, secondary sedimentation basins 8, water purifying tank 9 etc., wherein, stanniferous PCB trade effluent enters pump well 1 by waste line, centralized collection and preliminarily stabilised adjustment is carried out at this, the outlet of pump well 1 connects coarse rack 2 by waste line, the major diameter solid matter in trade effluent is removed at this, the outlet of coarse rack 2 connects primary sedimentation basin 3 by waste line, the insoluble substance in waste water is removed further at this, the outlet 3 of primary sedimentation basin connects pH value equalizing tank 4 by waste line, waste water carries out neutralizing treatment at this and carries out the fine adjustment of pH value, the pH value range of pH value equalizing tank 4 water outlet is 5.5 ~ 6.5, the requirement of water pH value is entered with what meet Lalgine-biocatalysis adsorption cleaning system 5, the outlet of pH value equalizing tank 4 connects Lalgine-biocatalysis adsorption cleaning system 5 by waste line, the sludge material outward transport process that Lalgine-biocatalysis adsorption cleaning system 5 is discharged, simultaneously, the outlet of Lalgine-biocatalysis adsorption cleaning system 5 connects aeration nitrification tank 6 by waste line, at this by aerobic aeration process, the various nitrogenous substancess in waste water are made all to be converted into nitrate nitrogen, the outlet of aeration nitrification tank 6 connects biological denitrificaion pond 7 by waste line, its effect is by biological activity reaction process, by the nitrate nitrogen decomposition and inversion in waste water, thus removal nitrate nitrogen, the outlet in biological denitrificaion pond 7 is by waste line connecting secondary settling tank 8, at this, residue insoluble substance in waste water is all removed, the outlet of secondary sedimentation basins 8 connects water purifying tank 9 by waste line, purification water outlet after native system process is arranged outward by waste line by the outlet of water purifying tank 9, wherein, the pond body 51 of Lalgine-biocatalysis adsorption cleaning system 5 adopts glass reinforced plastic material, and pond body useful volume is 225m
3, on the left of the body of pond, inlet valve 56 and flexible mud pusher 59 are equipped with in below, and flowing water Valve 57 is housed above right side, lower right-hand side is provided with mud row mouth 58, light Steel Bracket 52 is equipped with on body top, pond, it is fixed with 3 groups of totally 9 atomizers 53, is fixed with 3 covers rolling absorption brushes 54 in the middle part of the body of pond, brush long 4.5m, the long 10cm of bristle, the operating voltage of its drive-motor is 380V, and swing circle is 260s, often cover rolls to adsorb on the left of brush 54 and is provided with 1 stationary brush 55, adsorbs brush 54 fit with rolling, the PCB trade effluent of (after process, pH value is 5.5 ~ 6.5) after process is regulated to enter purification system by the inlet valve 56 of below on the left of Lalgine-biocatalysis adsorption cleaning system 5 through pH value, the 3 cover rolling absorption brushes 54 be positioned in the middle part of the body of pond start clockwise rolling, on it, the Lalgine of attachment fully contacts with the tin ion in waste water with sargassum thunbergii, by the hydroxyl on Lalgine and sargassum thunbergii molecular chain, carboxyl, the complex reaction that amide group optionally occurs with tin ion, make tin in waste water by sargassum thunbergii efficient adsorption, by stationary brush 55 the sargassum thunbergii residue after absorption reaction brushed afterwards and make it bottom natural subsidence to pond, form sludge material gradually, after promoted by flexible mud pusher 59, pond body is discharged through mud row mouth 58, simultaneously, brush clean rolling bristle through stationary brush 55 to continue to do more than clockwise movement to the water surface, again Lalgine-sargassum thunbergii mixed solution is sprayed by atomizer 53, make rolling adsorb brush 54 to be regenerated, again enter in water through clockwise movement path, start new absorption reaction process, wherein the effect of pH value equalizing tank 4 is that the waste water ph through primary sedimentation is adjusted to 5.5 ~ 6.5, enters the requirement of water pH value with what meet Lalgine-biocatalysis adsorption cleaning system 5, wherein, in Lalgine-sargassum thunbergii mixed solution, the mass concentration of Lalgine and sargassum thunbergii is respectively 85.0mg/L and 5.5g/L.
By the PCB trade effluent after native system process, its tin removal efficiency can reach 99.2%.
Claims (3)
1. remove the treatment system of tin in PCB trade effluent for one kind, it is characterized in that, this system comprises pump well, coarse rack, primary sedimentation basin, pH value equalizing tank, Lalgine-biocatalysis adsorption cleaning system, aeration nitrification tank, biological denitrificaion pond, secondary sedimentation basins, water purifying tank etc., wherein, stanniferous PCB trade effluent enters pump well by waste line, the outlet of pump well connects coarse rack by waste line, the outlet of coarse rack connects primary sedimentation basin by waste line, the outlet of primary sedimentation basin connects pH value equalizing tank by waste line, the outlet of pH value equalizing tank connects Lalgine-biocatalysis adsorption cleaning system by waste line, the sludge material outward transport process that Lalgine-biocatalysis adsorption cleaning system is discharged, simultaneously, the outlet of Lalgine-biocatalysis adsorption cleaning system connects aeration nitrification tank by waste line, the outlet of aeration nitrification tank connects biological denitrificaion pond by waste line, the outlet in biological denitrificaion pond is by waste line connecting secondary settling tank, the outlet of secondary sedimentation basins connects water purifying tank by waste line, purification water outlet is after treatment arranged outward by waste line by the outlet of water purifying tank, wherein, the pond body of Lalgine-biocatalysis adsorption cleaning system adopts glass reinforced plastic material, on the left of the body of pond, inlet valve and flexible mud pusher are equipped with in below, flowing water Valve is equipped with in top, right side, and lower right-hand side is provided with mud row mouth, and light Steel Bracket is equipped with on body top, pond, it is fixed with 3 groups of totally 9 atomizers, be fixed with 3 covers rolling absorption in the middle part of the body of pond to brush, often cover rolls to adsorb on the left of brush and is provided with 1 stationary brush, adsorbs to brush fit with rolling, through pH value regulate process after pH value be 5.0 ~ 6.5 PCB trade effluent by the left of Lalgine-biocatalysis adsorption cleaning system below inlet valve enter purification system, 3 covers be positioned in the middle part of the body of pond roll to adsorb to brush and start to roll clockwise, on it, the Lalgine of attachment fully contacts with the tin ion in waste water with sargassum thunbergii, by the hydroxyl on Lalgine and sargassum thunbergii molecular chain, carboxyl, the complex reaction that amide group optionally occurs with tin ion, make tin in waste water by sargassum thunbergii efficient adsorption, by stationary brush the sargassum thunbergii residue after absorption reaction brushed afterwards and make it bottom natural subsidence to pond, form sludge material gradually, after promoted by flexible mud pusher, pond body is discharged through mud row mouth, simultaneously, brush clean rolling bristle through stationary brush to continue to do more than clockwise movement to the water surface, again spray Lalgine-sargassum thunbergii mixed solution by atomizer, make rolling adsorb brush and regenerated, again enter in water through clockwise movement path, start new absorption reaction process.
2. the treatment system of tin in removal PCB trade effluent according to claim 1, it is characterized in that, the pond body useful volume of Lalgine-biocatalysis adsorption cleaning system is 225m
3, its roll absorption brush long 4.5m, the long 10cm of bristle, the operating voltage of its drive-motor is 380V, and swing circle is 260s.
3. the treatment system of tin in removal PCB trade effluent according to claim 1, it is characterized in that, in Lalgine-sargassum thunbergii mixed solution, the mass concentration of Lalgine and sargassum thunbergii is respectively 85.0mg/L and 5.5g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610119577.3A CN105541055B (en) | 2016-03-03 | 2016-03-03 | Treatment system for removing tin in PCB industrial wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610119577.3A CN105541055B (en) | 2016-03-03 | 2016-03-03 | Treatment system for removing tin in PCB industrial wastewater |
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| CN105541055B CN105541055B (en) | 2017-05-24 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5122279A (en) * | 1991-04-08 | 1992-06-16 | Romar Technologies Inc. | Ferrous dithionite process and compositions for removing dissolved heavy metals from water |
| CN101898848A (en) * | 2010-01-11 | 2010-12-01 | 深圳市东江环保股份有限公司 | Treatment method of wastewater containing ammonia and nitrogen from circuit board plant |
| CN102115890A (en) * | 2011-01-04 | 2011-07-06 | 华南理工大学 | Total recycling method of PCB (printed circuit board) nitric acid type tin-lead stripping waste liquid |
-
2016
- 2016-03-03 CN CN201610119577.3A patent/CN105541055B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5122279A (en) * | 1991-04-08 | 1992-06-16 | Romar Technologies Inc. | Ferrous dithionite process and compositions for removing dissolved heavy metals from water |
| CN101898848A (en) * | 2010-01-11 | 2010-12-01 | 深圳市东江环保股份有限公司 | Treatment method of wastewater containing ammonia and nitrogen from circuit board plant |
| CN102115890A (en) * | 2011-01-04 | 2011-07-06 | 华南理工大学 | Total recycling method of PCB (printed circuit board) nitric acid type tin-lead stripping waste liquid |
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Inventor after: He Yanquan Inventor before: Ye Cheng |
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Effective date of registration: 20170421 Address after: 510000 Guangdong, Nansha District, Tung Chung Town, the town of Wai Wai Street on the first floor, layer 76, No. two, No. Applicant after: GUANGZHOU MANKUN ELECTRONIC CO.,LTD. Address before: Tianhe District Tong East Road Guangzhou city Guangdong province 510665 B-101 No. 5, room B-118 Applicant before: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Effective date of registration: 20170421 Address after: Tianhe District Tong East Road Guangzhou city Guangdong province 510665 B-101 No. 5, room B-118 Applicant after: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Address before: Ma Shi Jie, Shangcheng District in Hangzhou city Zhejiang province 310012 155 unit 2, Room 401 Applicant before: HANGZHOU QICHENG SCIENCE & TECHNOLOGY Co.,Ltd. |
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