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Method for treating rolling emulsification wastewater through electrocoagulation

A technology for emulsification of wastewater and electrocoagulation, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of polluting ground water bodies and groundwater sources, destroying the ecological environment, and difficult to treat wastewater. , to achieve the effect of excellent demulsification effect, easy operation and automation

Inactive Publication Date: 2015-01-21
SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] During metal cutting and rolling, oil-containing emulsified wastewater will be produced. The wastewater mainly contains mineral oil, emulsifiers, backlog anti-wear and anti-rust agents and other components. Due to the high oil content and COD value of the wastewater, and a large amount of The surface activity of the surfactant makes the emulsification stability of the wastewater very high, so this type of wastewater is difficult to treat. If it is discharged directly without treatment, this type of wastewater will seriously pollute surface water bodies and groundwater sources, and damage the ecological environment.

Method used

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  • Method for treating rolling emulsification wastewater through electrocoagulation

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Effect test

Embodiment 1

[0015] After filtering the emulsified rolling waste water, pump it into the electrolytic cell (the electric plate of the electrolytic cell is an aluminum plate with a surface area of ​​116cm2, with a distance of 1cm, and the anode and cathode plates are distributed in multiple groups in the electrolytic cell), and at the same time, add 1.25g to the electrolytic cell / L electrolyte sodium chloride, and adjust the PH value of the wastewater to 6.0, pass a direct current with a current intensity of 4mA / cm2 into the electrolytic cell, after the electrolysis reaction for 40 minutes, let it stand for 1 hour and scrape off the suspended oil on the liquid surface , the discharged supernatant water is the treated drainage.

Embodiment 2

[0016] Embodiment two: processing effect

[0017] Using the method of electrocoagulation treatment of rolling emulsified wastewater according to the present invention, a certain rolling emulsified wastewater is treated, and compared with the chemical flocculation method, the treatment effect is shown in Table-1.

[0018] Table-1 Treatment effect

[0019]

[0020] It can be seen from Table-1 that the electrocoagulation treatment effect of the present invention is better than that of chemical flocculation, the COD removal rate of wastewater reaches 99.5%, and the turbidity removal rate reaches 99.6%. The reason may be that (1) the flocculation effect of the new ecological polyaluminum chloride produced by electrolysis is better, and (2) the ClO-oxidant produced by the electrode reaction can oxidize the organic matter.

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Abstract

The invention relates to a method for treating rolling emulsification wastewater through electrocoagulation, belonging to the field of wastewater treatment methods. The method for treating rolling emulsification wastewater through electrocoagulation comprises the following steps: filtering rolling emulsification wastewater, pumping into an electrolytic bath, adding electrolyte sodium chloride into the electrolytic bath, adjusting the pH value of the wastewater to be 5.5-6.5, electrifying the electrolytic bath, after the electrolysis reaction, standing to precipitate for 1 hour, subsequently wiping off suspension oil on the liquid level, and discharging the supernate, that is, the treated effluent. According to the method for treating rolling emulsification wastewater through electrocoagulation, an electrocoagulation method is adopted to treat the rolling emulsification wastewater, the demulsification effect is superior to that of a chemical flocculation method under optimal conditions, the COD removal rate of the wastewater is up to 99.5%, the turbidity removal rate is 99.6%, and the method has the advantages of easiness in operation, automation achievement and the like.

Description

technical field [0001] The invention relates to a method for electrocoagulation treatment of rolling emulsified wastewater, which belongs to the field of wastewater treatment methods. Background technique [0002] During metal cutting and rolling, oil-containing emulsified wastewater will be produced. The wastewater mainly contains mineral oil, emulsifiers, backlog anti-wear and anti-rust agents and other components. Due to the high oil content and COD value of the wastewater, and a large amount of The surface activity of surfactants makes the emulsification stability of wastewater very high, so this type of wastewater is difficult to treat. If it is discharged directly without treatment, this type of wastewater will seriously pollute surface water bodies and groundwater sources, and damage the ecological environment. Electrocoagulation, also known as electroflocculation or electric flotation, mainly uses the principle of electrolysis to electrochemically treat wastewater. T...

Claims

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Application Information

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IPC IPC(8): C02F1/463
CPCC02F1/463
Inventor 陆强
Owner SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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