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Treatment method for printed circuit board sewage

A printed circuit board and treatment method technology, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. problems, to achieve the effect of reducing solid particle content, reducing chemical oxygen demand, and reducing sludge compaction

Inactive Publication Date: 2019-07-09
SHENNAN CIRCUITS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of organic matter dissolves in the pollution, which leads to an increase in the chemical oxygen demand of the ink wastewater, making it difficult to treat
[0003] In the prior art, the combination of acid analysis and air flotation process is usually used to treat ink sewage, but the treatment effect is not good
On the one hand, the reduction of chemical oxygen demand by this process is limited, and it is difficult to meet the emission standards
On the other hand, the solid sediment produced by this process increases the difficulty of the subsequent treatment process and also increases the treatment cost
[0004] In the long-term research and development process, the inventor of the present application found that the existing ink wastewater treatment method is difficult to treat solid sediments, and cannot effectively reduce the chemical oxygen demand

Method used

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  • Treatment method for printed circuit board sewage
  • Treatment method for printed circuit board sewage
  • Treatment method for printed circuit board sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Adjust the pH of the ink wastewater to 2.5, and put the coagulant polyferric sulfate into the concentration of 0.16mg / L, and the stirring speed is 150 rpm; after 20 minutes of reaction, adjust the pH of the ink wastewater to 4, and after 20 minutes of reaction, follow Add flocculant polyacrylamide at a concentration of 5mg / L, and transfer the ink wastewater to a treatment load of 1m 3 / (m 2 h) Sedimentation tank.

[0068]Put 6g / L ferrous sulfate and 2.5g / L hydrogen peroxide into the effluent of the sedimentation tank for oxidation treatment, and transfer the effluent of the oxidation treatment and the liquid obtained after press filtration of the sludge in the sedimentation tank to the organic wastewater regulating tank for treatment. The effluent of the organic wastewater adjustment tank is adjusted to a pH of 7, and then anaerobic treatment, anoxic treatment, and good-care treatment are performed, and the waste water after the good-care treatment is subjected to the ...

Embodiment 2

[0070] Adjust the pH of the ink wastewater to 2.8, and put in the coagulant polymerized ferric sulfate at a concentration of 0.15 mg / L, and the stirring speed is 150 rpm; after 15 minutes of reaction, adjust the pH of the ink wastewater to 4.5, and after 20 minutes of reaction according to Add flocculant polyacrylamide at a concentration of 5mg / L, and transfer the ink wastewater to a treatment load of 1m 3 / (m 2 h) Sedimentation tank.

[0071] Put 4g / L ferrous sulfate and 2g / L hydrogen peroxide into the effluent of the sedimentation tank for oxidation treatment, and transfer the effluent of the oxidation treatment and the liquid obtained after press filtration of the sludge in the sedimentation tank to the organic wastewater regulating tank for treatment. The effluent of the organic wastewater regulating tank is adjusted to a pH of 6, and then anaerobic treatment, anoxic treatment and good-care treatment are performed, and the waste water after the good-care treatment is subj...

Embodiment 3

[0073] Adjust the pH of the ink wastewater to 2.6, and put in the coagulant polymerized ferric sulfate at a concentration of 0.17 mg / L, and the stirring speed is 150 rpm; after 30 minutes of reaction, adjust the pH of the ink wastewater to 4.1, and react for 25 minutes. Add flocculant polyacrylamide at a concentration of 5mg / L, and transfer the ink wastewater to a treatment load of 1m 3 / (m 2 h) Sedimentation tank.

[0074] Put 8g / L ferrous sulfate and 3g / L hydrogen peroxide into the effluent of the sedimentation tank for oxidation treatment, and transfer the effluent of the oxidation treatment and the liquid obtained after press filtration of the sludge in the sedimentation tank to the organic wastewater regulating tank for treatment. The effluent of the organic wastewater adjustment tank is adjusted to a pH of 8, and then anaerobic treatment, anoxic treatment, and good-care treatment are performed, and the waste water after the good-care treatment is subjected to the first ...

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Abstract

The invention discloses a treatment method for printed circuit board sewage. The method comprises the following steps: adjusting ink wastewater to be acidic, and adding a first coagulant into the inkwastewater adjusted to be acidic for full coagulation; adding a first flocculating agent into the ink wastewater in which the first coagulant is added; and performing precipitation treatment on the flocculated ink wastewater, and performing oxidation treatment on the waste liquid obtained after the precipitation treatment. By the above manner, the method provided by the invention can reduce hardening of sludge at the bottom of a precipitation tank and further reduce a chemical oxygen demand of the sewage.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for printed circuit board sewage. Background technique [0002] The composition of ink is mainly composed of resin, filler, pigment, additives and solvent, etc. The main component of resin is macromolecular organic matter, which is weakly acidic and can react with alkaline developer and film remover to dissolve into the developer. And in the film removal solution, ink waste water is generated. A large amount of organic matter dissolves in the sewage, which leads to an increase in the chemical oxygen demand of the ink wastewater, which is difficult to treat. [0003] In the prior art, the combination of acid analysis and air flotation process is usually used to treat the ink sewage, but the treatment effect is not good. On the one hand, the reduction of chemical oxygen demand by this process is limited, and it is difficult to meet the emission standar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/14C02F103/16
CPCC02F9/00C02F2103/16C02F1/5236C02F1/56C02F2001/007C02F1/722C02F2301/08C02F3/30C02F1/001
Inventor 周进群刘庆辉陈刚
Owner SHENNAN CIRCUITS
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