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Method for pre-treating organic industrial wastewater based on ferric-carbon micro-electrolysis activated persulfate

A technology for activating persulfate and iron-carbon micro-electrolysis, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of easy stop of reaction and activated persulfate reaction rate Faster and other problems, to achieve the effect of strengthening treatment efficiency, improving removal efficiency, and convenient operation

Inactive Publication Date: 2015-09-09
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for pretreatment of organic industrial wastewater based on iron-carbon micro-electrolysis activation of persulfate, which can solve the problem of conventional Fe 2+ The reaction rate of activated persulfate is too fast, and the reaction is easy to stop

Method used

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  • Method for pre-treating organic industrial wastewater based on ferric-carbon micro-electrolysis activated persulfate

Examples

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Effect test

Embodiment 1

[0030] The industrial wastewater in this example is taken from the drainage of a large chemical enterprise. In order to verify the strengthening of the present invention on the degradation efficiency of refractory pollutants, at the same time only iron-carbon micro-electrolysis was carried out, and Fe 2+ The contrast of activating persulfate, concrete implementation steps are as follows:

[0031] (1) The chemical wastewater mainly contains benzene and caprolactam, and the COD is 4000-5000mg / L. Take 1L of wastewater into the reactor, add iron and carbon with a mass ratio of 1:1, and the amount of iron is 60g. Use HCl to adjust the wastewater The initial pH of the water is 4-5, and aeration is carried out, and the aeration rate is 3-4mg / L;

[0032] (2) add K in the reactor in step (1) 2 S 2 o 8 , to start the persulfate radical oxidation reaction, K 2 S 2 o 8 The dosage is 3mM, and the reaction time is 1.5h;

[0033] (3) pour out the mixed solution that the reaction finis...

Embodiment 2

[0040] The industrial wastewater in this example is taken from the drainage of a chemical plant, mainly containing organic pollutants such as nitrobenzene, nonylphenol polyoxyethylene ether NP10, chloroform, and cyclohexanone, with a COD of 3400-4800 mg / L. Based on the method of iron-carbon micro-electrolysis activation persulfate treatment, the specific steps are as follows:

[0041] (1) Take 500mL of waste water in the reactor, add iron and carbon with a mass ratio of 0.5:1, the amount of iron is 100g, adjust the initial pH of the waste water with HCl to be 5-6, and aerate, the aeration rate is 2-4mg / L;

[0042] (2) add K in the reactor in step (1) 2 S 2 o 8 , to start the persulfate radical oxidation reaction, K 2 S 2 o 8 The dosage is 5mM, and the reaction time is 1h;

[0043] (3) After the reaction is over, pour out the mixed solution in step (2), carry out coagulation precipitation reaction, add Ca(OH) 2 Adjust the pH to 9, then add anionic PAM (dosing amount 2mg...

Embodiment 3

[0046] The industrial wastewater taken in this example is the effluent of a printing and dyeing factory, mainly containing aniline, polyvinyl alcohol and some disperse dyes, and the COD concentration is 5000-8000 mg / L. Using the method of the present invention, the specific implementation steps are as follows:

[0047] (1) Take 500mL of water sample, adjust the initial pH to about 5 with HCl, add iron and carbon with a mass ratio of 3:1, the amount of iron is 50g / L; perform aeration, the aeration rate is 3-5mg / L ;

[0048] (2) In the reactor of step (1), add the Na of 8mM 2 S 2 o 8 , the reaction time is 2.5h;

[0049] (3) After the reaction is over, pour out the mixed solution in step (2), carry out coagulation precipitation reaction, add Ca(OH) 2 Adjust the pH to 10, based on the volume of the mixed solution after the reaction, add anionic PAM (dosing amount 1.5mg / L), stir for 40s, settle for 2 hours, the muddy water is clearly separated, and the supernatant is the post-...

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Abstract

The invention relates to a method for pre-treating organic industrial wastewater based on ferric-carbon micro-electrolysis activated persulfate. The method comprises the following steps: adding iron Fe and carbon C into a reactor in which to-be-treated wastewater is filled, regulating the pH value of the wastewater to 3.0-6.0 and carrying out aeration; adding persulfate into the reactor, starting reaction, and ending the reaction within 0.5-3 hours; carrying out coagulating sedimentation on reacted mixed liquor to regulate the mixed liquor to be basic, adding a coagulant aid into the basic mixed liquor, stirring the basic mixed liquor, and settling the basic mixed liquor to obtain liquid supernatant which is pollutant-treated outlet water. According to the method, the problems that conventional Fe<2+> activated persulfate reaction rate is too high and the reaction is liable to stop are solved. The method is used for pre-treating various high-concentration degradation-resistant organic industrial wastewater, is high in efficiency, convenient to operate and environmentally-friendly, and wide prospect is provided for treating the degradation-resistant industrial wastewater.

Description

technical field [0001] The invention belongs to the field of pretreatment of industrial wastewater, in particular to a method for pretreating organic industrial wastewater based on iron-carbon micro-electrolysis activation of persulfate. Background technique [0002] With the accelerated pace of national energy conservation and emission reduction, as well as the determination of environmental pollution control, the sewage treatment standards are increasing day by day. Industrial wastewater not only has a large amount of discharge and high concentration, but also has a variety of types, is difficult to degrade, has strong toxicity, and poor biodegradability. Traditional biological treatment cannot meet the treatment requirements. At present, pretreatment is often carried out before biochemical treatment in order to reduce the load of biochemical treatment and improve the biodegradability of wastewater. Therefore, efficient pretreatment technology is in urgent need. [0003] ...

Claims

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Application Information

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IPC IPC(8): C02F9/06
Inventor 陈红薛罡毕传健李响赵旭好孟迪
Owner DONGHUA UNIV
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