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Pretreatment method of electrophoresis painting waste liquid with high COD concentration

A pretreatment and electrophoresis technology, applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc. The effect of improving conductivity

Inactive Publication Date: 2020-03-31
CHANGZHOU CHEFF ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above prior art does not relate to how to effectively pretreat high-concentration electrophoretic varnishing waste liquid, that is, how to reduce the difficulty of disposing of electrophoretic varnishing waste liquid so that after the waste liquid is pretreated, it can be used as a general waste liquid. Industrial wastewater and make it possible for conventional comprehensive treatment, and finally achieve standard discharge or production reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of pretreatment method of high COD concentration electrophoresis paint waste liquid, comprises the steps:

[0026] (1) Use the sodium hydroxide aqueous solution of mass fraction 30% to adjust pH, make the pH value of electrophoretic painting waste liquid be 9, the COD of described electrophoretic painting waste liquid is 150000mg / L;

[0027] (2) Add 30% mass fraction of sodium chloride solution, the addition amount is 1% of the quality of electrophoresis paint waste liquid, and stir for 3min at 80rpm; then add 7% mass fraction of coagulant aqueous solution, the addition amount is electrophoresis coating 3% of the quality of the paint waste liquid, stirred at 60rpm for 5min, the coagulant aqueous solution includes the following components in parts by weight: 5 parts of polyaluminum chloride, 1 part of sodium hydroxide, 1 part of water-soluble melamine formaldehyde resin, 93 parts of water share;

[0028] (3) Then add a polyacrylamide aqueous solution with a mass ...

Embodiment 2

[0032] A kind of pretreatment method of high COD concentration electrophoresis paint waste liquid, comprises the steps:

[0033] (1) Use the sodium hydroxide aqueous solution of mass fraction 30% to adjust pH, make the pH value of electrophoretic painting waste liquid be 8.5, the COD of described electrophoretic painting waste liquid is 150000mg / L;

[0034] (2) Add 30% sodium chloride solution in an amount of 1.2% of the quality of the electrophoresis varnishing waste liquid, and stir for 3 minutes at 80rpm; then add a 7% coagulant aqueous solution in an amount of 3.5% of the quality of the paint waste liquid, stirred at 60rpm for 4min, the coagulant aqueous solution includes the following components in parts by weight: 5 parts of polyaluminum chloride, 1 part of sodium hydroxide, 1 part of water-soluble melamine formaldehyde resin, 93 parts of water share;

[0035] (3) Then add a polyacrylamide aqueous solution with a mass fraction of 1%, the addition amount is 6‰ of the mas...

Embodiment 3

[0038] A kind of pretreatment method of high COD concentration electrophoresis paint waste liquid, comprises the steps:

[0039] (1) Use the sodium hydroxide aqueous solution of mass fraction 30% to adjust pH, make the pH value of electrophoretic painting waste liquid be 9.5, the COD of described electrophoretic painting waste liquid is 150000mg / L;

[0040] (2) Add 30% mass fraction of sodium chloride solution, the addition amount is 1% of the quality of electrophoresis paint waste liquid, and stir for 3min at 80rpm; then add 7% mass fraction of coagulant aqueous solution, the addition amount is electrophoresis coating 5% of the quality of the paint waste liquid, stirred at 60rpm for 4min, the coagulant aqueous solution includes the following components in parts by weight: 5 parts of polyaluminum chloride, 1 part of sodium hydroxide, 1 part of water-soluble melamine formaldehyde resin, 93 parts of water share;

[0041] (3) Then add a polyacrylamide aqueous solution with a mas...

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Abstract

The invention relates to a pretreatment method of an electrophoresis painting waste liquid with a high COD concentration. The method comprises adjusting the pH value of an electrophoretic painting waste liquid to 8.5-9.5, adding a sodium chloride solution into the waste liquid, carrying out stirring, adding a coagulant aqueous solution into the solution, carrying out stirring, wherein the coagulant aqueous solution are composed of polyaluminum chloride, sodium hydroxide and water-soluble melamine formaldehyde resin, adding a polyacrylamide aqueous solution into the solution, carrying out stirring and standing for precipitation, separating water from sludge precipitates after precipitation, carrying out filter pressing and drying on the sludge precipitates, taking a supernatant and carryingout subsequent conventional wastewater treatment. The removal rate of COD in the supernatant is greater than 86% or above. According to the method, the COD of the high-COD-concentration electrophoresis painting waste liquid can be effectively reduced, the treatment difficulty is lowered, the high-COD-concentration electrophoresis painting waste liquid can be used as general industrial wastewaterafter being pretreated and can be subjected to conventional comprehensive treatment, and finally up-to-standard discharge or production recycling is achieved.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a pretreatment method for high COD concentration electrophoretic paint waste liquid. Background technique [0002] At present, the electrophoretic painting production line uses the electrophoretic process to paint the target workpiece. During the electrophoretic painting process, due to the long-term use of the electrophoretic liquid in the electrophoretic tank, impurities in it increase, resulting in a decrease in electrophoretic efficiency, and due to the effective composition of the electrophoretic paint The substance is resinous organic matter, and the resinous organic matter in the electrophoretic paint is easy to age during use. In order to ensure the quality requirements of the electrophoretic paint, the electrophoretic paint bath needs to be replaced regularly. Due to the high concentration and strong pollution of the replaced electrophoretic paint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/5236C02F1/56C02F1/66C02F2101/20
Inventor 邱立伟袁莉萍张尧朱小雪独孤雪梅
Owner CHANGZHOU CHEFF ENVIRONMENTAL PROTECTION TECH