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Coagulation-microfiltration treatment method of automobile painting degreasing wastewater

A coagulation and microfiltration technology

Inactive Publication Date: 2014-12-03
江苏天诚车饰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has many limitations and harsh requirements for wastewater treatment, long treatment cycle, large floor area, unstable effluent quality, and the treated wastewater usually cannot meet the requirements of discharge or recycling.

Method used

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  • Coagulation-microfiltration treatment method of automobile painting degreasing wastewater
  • Coagulation-microfiltration treatment method of automobile painting degreasing wastewater

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Experimental program
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Embodiment

[0022] figure 1 For the coagulation-microfiltration process flow chart of automobile painting degreasing wastewater described in the present invention, as figure 1 Shown:

[0023] (1) Coagulation: Add degreasing waste water in the coagulation reaction tank 1, then add the polyacrylic acid of 85mg / L thereinto, stir rapidly 5min; Then the mass percentage composition of 900mg / L is 10% milk of lime is added into In the degreasing waste liquid, the pH value of the solution in the coagulation reaction tank 1 was 11.6, and stirred slowly for 3 minutes to obtain the feed liquid;

[0024] (2) microfiltration treatment: the feeding liquid described in step (1) is passed in the microfiltration pool 2 that is made up of zirconia membrane tube with pump, and the pipe length of described zirconia membrane tube is 25cm, and the aperture on the membrane is 0.2μm, the operating pressure difference of the microfiltration tank 2 is 0.10MPa, and the membrane surface flow velocity is 5m / s; the o...

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Abstract

The invention provides a coagulation-microfiltration treatment method of automobile painting degreasing wastewater. The method comprises the following steps: adding degreasing wastewater into a coagulation reaction tank, adding a 70-100 mg / L flocculant, and quickly stirring for 5 minutes; adding an 800-1000 mg / L coagulant aid into the degreasing wastewater until the pH value of the solution is 10-12, and slowly stirring for 3 minutes to obtain a solution; pumping the solution into a microfiltration tank composed of ceramic membrane tubes, wherein the operation pressure difference in the microfiltration tank is 0.05-0.15 MPa, and the membrane surface flow rate is 1-6 m / s; passing the obtained filtrate through a neutralization tank, and circularly flushing with water to obtain the coagulation-microfiltration treatment solution which conforms to the discharge requirements; and sending the trapped fluid into a sludge tank. The method has the advantages of simple equipment and technique, small occupied area, short turnaround speed and environment friendliness; and the obtained effluent water solution has high and stable water quality. Compared with the original degreasing wastewater, the COD (chemical oxygen demand) removal rate of the coagulation-microfiltration treatment solution obtained by the technique is 97.2%, the oil mass removal rate is 99.6%, the phosphate removal rate is 99.6%, and thus, the method has favorable application prospects.

Description

technical field [0001] The invention relates to a treatment method for industrial waste water, in particular to a coagulation-microfiltration method for treating automobile painting degreasing waste water. Background technique [0002] As one of the pillar industries in our country, automobile manufacturing has developed rapidly, but the treatment of its coating wastewater has always been a major problem in research. Automobile painting is the main measure to protect and decorate automobiles. The painting process generally consists of three basic processes: surface treatment before painting, coating and drying. Surface treatment before painting is the basis of the painting process, and degreasing wastewater is produced here process. However, the COD (chemical oxygen demand) value, phosphate phosphorus content and oil content in degreasing wastewater are all very high, far exceeding the discharge standards stipulated by the state, causing great harm to the environment. Degr...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 崔富民
Owner 江苏天诚车饰科技有限公司