Automotive painting electrophoresis waste water preprocessing system and method

A coating electrophoresis and pretreatment technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of difficult to meet discharge standards, unstable effluent quality, and poor treatment effect Ideal and other issues, to achieve the effect of small footprint, easy sludge discharge, and short settling time

Pending Publication Date: 2019-06-14
FAW VOLKSWAGEN AUTOMOTIVE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment effect is not satisfactory, the effluent quality is unstable, and it is difficult to meet the discharge standard

Method used

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  • Automotive painting electrophoresis waste water preprocessing system and method

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Effect test

Embodiment 1

[0037] Such as figure 1 As shown, the present invention provides a kind of electrophoretic wastewater pretreatment system for automobile coating, comprising a feeding unit, a reaction unit, a filtering unit and a pH adjustment unit connected in sequence; the feeding unit is used to receive and accommodate wastewater containing electrophoretic liquid; The reaction unit includes an electrophoresis reaction tank and a sedimentation tank connected in sequence. The sedimentation tank includes a liquid discharge port and a sludge discharge port (not marked in the figure, the dotted line in the figure is the sludge flow direction, and the solid line is the filtrate flow direction), the liquid discharge port and the sludge discharge port The filter units are connected, and a sludge treatment device is installed at the sludge discharge port; among them, there are two reaction units, which are the primary reaction unit and the secondary reaction unit connected in series, and the sediment...

Embodiment 2

[0043] The present invention provides a method for pretreatment of electrophoresis wastewater from automobile coating, which is based on the above system and includes the following steps:

[0044] (1) Primary coagulation reaction

[0045] Add NaOH to the phosphating wastewater produced by the second-phase coating wastewater station of the FAW-Volkswagen Foshan plant (the average COD of the electrophoresis influent is 3300mg / L) until the pH value reaches 9.9, and react for 10 minutes; then add lime milk to adjust the pH value 10, and stir for 10 minutes; then add polyaluminum chloride and stir for 15 minutes; finally add anionic polyacrylamide and stir for 15 minutes to obtain a primary treatment solution;

[0046] (2) Primary precipitation separation

[0047] The primary treatment liquid is injected into the vertical flow sedimentation tank for primary sedimentation and separation to obtain the primary filtrate and primary mud, and the primary mud is concentrated and then dew...

Embodiment 3

[0055] The present invention provides a method for pretreatment of electrophoresis wastewater from automobile coating, which is based on the above system and includes the following steps:

[0056] (1) Primary coagulation reaction

[0057] Add NaOH to the rinse solution produced in the electrophoresis area of ​​the waste water station of the Tianjin factory (the average water inflow of the electrophoresis line is 1800mg / L) to a pH value of 10.5, and react for 15 minutes; then add milk of lime, adjust the pH value to 10.5, and stir for 15 minutes ; Then add polyaluminum chloride and stir for 15 minutes; finally add anionic polyacrylamide and stir for 15 minutes to obtain a primary treatment solution;

[0058] (2) Primary precipitation separation

[0059] The primary treatment liquid is injected into the vertical flow sedimentation tank for primary sedimentation and separation to obtain the primary filtrate and primary mud, and the primary mud is concentrated and then dewatered ...

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Abstract

The invention discloses an automotive painting electrophoresis waste water preprocessing system and method. The system comprises a material feeding unit, reaction units, a filtering unit and a pH (Potential of Hydrogen) regulation unit communicated in sequence, wherein the material feeding unit is full of waste water containing electrophoresis liquid; the reaction unit comprises an electrophoresisreaction tank and a precipitation tank communicated in sequence; the precipitation tank comprises a liquid discharge hole and a sludge discharge hole; the liquid discharge hole is communicated with the filtering unit; the sludge discharge hole is provided with a sludge processing device; two reaction units are respectively a first-level reaction unit and a second-level reaction unit connected inseries; the precipitation tank in the first-level reaction unit is a vertical flow precipitation tank, and a precipitation tank in the second-level reaction unit is a sloping plate precipitation tank.The method is characterized in that a secondary coagulating precipitation technology is adopted for processing, the vertical flow precipitation tank is adopted in first-level precipitation separation, the sloping plate precipitation tank is adopted in second-level precipitation processing, and a coagulation process is accurately controlled. The system is convenient in operation, is stable in operation and has a simple technical process, and drainage COD (Chemical Oxygen Demand) concentration can be lowered to be 1000mg / L.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a pretreatment system and method for electrophoresis wastewater from automobile coating. Background technique [0002] The painting of automobiles and their parts is one of the links that generate the most wastewater discharge in the automobile manufacturing process. Coating wastewater contains resin, surfactant, heavy metal ions, Oil, PO 4 3- , paints, pigments, organic solvents and other pollutants. The coating wastewater mainly comes from pre-degreasing, degreasing, surface adjustment, phosphating, passivation and other body pre-treatment processes, as well as cathodic electrophoresis process and intermediate coating and top coating processes. Among them, the electrophoretic wastewater of automobile coating mainly comes from the phosphating and electrophoretic wastewater discharged from the production process of parts. The main pollutants include resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C02F101/10C02F101/30
Inventor 赵岩谢小琛孟得磊
Owner FAW VOLKSWAGEN AUTOMOTIVE CO LTD
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