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Method for treating nitrobenzene wastewater through technique of strengthening Fenton oxidation with microwaves

A technology for the treatment of nitrobenzene wastewater, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor treatment effect of nitrobenzene wastewater, and achieve Large operating flexibility, long service life, and strong spectral effects

Inactive Publication Date: 2016-12-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing nitrobenzene wastewater treatment effect is not good, and to provide a method for treating nitrobenzene wastewater with microwave-enhanced Fenton oxidation technology with environmental protection significance. The method has strong operability, reasonable process design, The treatment efficiency of nitrobenzene wastewater is high, and the treated effluent can meet the pollutant discharge standard of GB 18918-2002 urban sewage treatment plant, realizing the discharge of sewage up to standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) In the nitrobenzene wastewater to be treated, add H 2 o 2 with FeC 2 o 4 The mixed reagent is put into the waste water until the mass concentration of hydrogen peroxide is 1%, after mixing evenly, use H 2 SO 4 Adjust the pH value of the mixed solution to 3.0, wherein the H in the mixed reagent 2 o 2 with Fe 2+ The molar ratio of H 2 o 2 : Fe 2+ =10:1.

[0023] (2) sending the mixed solution of step (1) into an industrial microwave oven with a power of 20KW to make it radiate for 30s in a microwave field;

[0024] (3) Aerating the mixed solution treated with microwaves in step (2) for 3 hours of oxidation reaction;

[0025] (4) adjust the pH value of the mixed solution with quicklime to be 8.5, settling and separating the upper layer liquid and the lower floor sludge, and the sludge is sent to the sludge collection tank;

[0026] (5) Filter the upper layer liquid of step (4) to obtain qualified process effluent; detect CODcr≤60mg / L in the treated water, a...

Embodiment 2

[0029] (1) In the nitrobenzene wastewater to be treated, the H 2 o 2 with FeSO 4 The mixed reagent is added to the waste water until the mass concentration of hydrogen peroxide is 0.1%, mix well, and use H 2 SO 4 Adjust the pH value of the mixed solution to 2.0, wherein the H in the mixed reagent 2 o 2 with Fe 2+ The molar ratio of H 2 o 2 : Fe 2+ =3:1.

[0030] (2) sending the mixed solution of step (1) into an industrial microwave oven with a power of 10KW, making it radiated in a microwave field for 60s;

[0031] (3) Aerating the mixed solution treated with microwaves in step (2) for 1 hour of oxidation reaction;

[0032] (4) adjust the pH value of the treated mixed solution with quicklime to be 8.5, separate the upper layer liquid and the lower layer sludge, and send the sludge to the sludge collection tank;

[0033] (5) Filter the upper layer liquid of step (4) to obtain qualified process effluent; detect CODcr≤60mg / L in the treated water, and the removal rate ...

Embodiment 3

[0036] (1) In the nitrobenzene wastewater to be treated, add H 2 o 2 with FeC 2 o 4 Mix the reagents until the mass concentration of hydrogen peroxide in water is 0.1%, mix well, and use H 2 SO 4 Adjust the pH value of the mixed solution to 4.0, wherein, H 2 o 2 with Fe 2+ The mixing ratio is H 2 o 2 : Fe 2+ =1:4 molar ratio.

[0037] (2) sending the mixed solution of step (1) into an industrial microwave oven with a power of 40KW to make it radiate in the microwave field for 5s;

[0038] (3) Aerate the mixed solution treated with microwave in step (2) for 2 hours for oxidation reaction

[0039] (4) Use quicklime to adjust the pH value of the treated wastewater to 8.5, precipitate and separate the upper liquid and lower sludge, and send the sludge to the sludge collection tank;

[0040] (5) Filter the upper layer liquid of step (4) to obtain qualified process effluent; detect CODcr≤60mg / L in the treated water, and the removal rate of nitrobenzene reaches 80%;

[0...

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PUM

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for treating nitrobenzene wastewater through a technique of strengthening Fenton oxidation with microwaves. The method comprises the following steps of (1) adding a mixed reagent of H2O2 and Fe<2+> to nitrobenzene wastewater; (2) conveying mixed liquid into an industrial microwave oven for treatment; (3) performing aeration for oxidizing the mixed liquid; and (4) adjusting the pH of the mixed liquid, and collecting sludge. Through the adoption of the method, the problem that the nitrobenzene wastewater is difficult to treat at present is effectively solved.

Description

technical field [0001] The invention relates to a method for treating nitrobenzene wastewater, in particular to a method for treating nitrobenzene wastewater by adopting microwave-enhanced Fenton oxidation technology, and belongs to the technical field of wastewater treatment. Background technique [0002] Nitrobenzene is a raw material for organic synthesis and an important organic solvent. Nitrobenzene in the environment mainly comes from waste water and waste gas from chemical plants and dye factories. Accidents during storage and transportation will also cause serious pollution of nitrobenzene. Nitrobenzene has extremely high stability in water. Because its density is higher than that of water, nitrobenzene that enters the water body will sink to the bottom of the water and remain unchanged for a long time. And because it has a certain solubility in water, it will cause water pollution. will last quite a long time. Nitrobenzene has a high boiling point and a slow evapo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
Inventor 丁红霞李玉杰杨忠林孙盛凯金汉强
Owner CHINA PETROLEUM & CHEM CORP
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