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Method for accumulating nitrite nitrogen by performing short-cut denitrification on p-aminodiphenyl amine production wastewater

A technology of p-aminodiphenylamine and short-range denitrification, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of reducing the total amount of aminodiphenylamine pollutants, Achieve the effects of solving emission and governance problems, reducing pollution, reducing TOC and formic acid content

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the defects existing in the prior art, the object of the present invention is to provide a method for effectively reducing the organic matter in the waste water produced by the p-aminodiphenylamine production unit and simultaneously accumulating NO 2 - The treatment method can greatly reduce the total amount of pollutants discharged into the environment by the production plant of p-aminodiphenylamine, so that the subsequent anammox treatment can be used to make up for the shortcomings of the existing technology

Method used

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  • Method for accumulating nitrite nitrogen by performing short-cut denitrification on p-aminodiphenyl amine production wastewater

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Experimental program
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Effect test

Embodiment 1

[0036] The flow rate of p-aminodiphenylamine production wastewater in a chemical plant is 100 t / d, and the pollutant indicators before entering the process are: wastewater TOC is 30320 mg / L, formic acid concentration is 117004 mg / L.

[0037] In the homogeneous adjustment tank, the p-aminodiphenylamine wastewater is mixed with the catalyst industrial wastewater containing nitrate, and a small amount of dilution water and the reflux water of the USB reactor are added to dilute the p-aminodiphenylamine wastewater, and the TOC in the effluent of the homogeneous adjustment tank 620.0 mg / L, formic acid 2378.1 mg / L, nitrate 2288.1 mg / L, the C / N ratio in the wastewater was maintained at about 1.2, and 90 mg / L urea and 4 mg / L potassium dihydrogen phosphate were added to it (in PO 4 3- count).

[0038] In the pH adjustment tank, use dilute HCl and the reflux water from the reactor to adjust the pH of the wastewater to 8.6. Then the wastewater flows into the air flotation tank by itse...

Embodiment 2

[0041] The flow rate of p-aminodiphenylamine production wastewater in a chemical plant is 110 t / d, and the pollutant indicators before entering the process are: influent TOC is 41700 mg / L, formic acid concentration is 150023 mg / L.

[0042] In the homogeneous adjustment tank, the p-aminodiphenylamine wastewater is mixed with the catalyst industrial wastewater containing nitrate, and a small amount of dilution water and the reflux water of the USB reactor are added to dilute the p-aminodiphenylamine wastewater. The TOC in the effluent of the homogeneous tank is 773.8 mg / L, formic acid is 2643.0 mg / L, nitrate is 2240.0 mg / L, and the C / N ratio in the wastewater is maintained at about 1.5. At the same time, 95 mg / L of urea and 5 mg / L of potassium dihydrogen phosphate ( by PO 4 3- count).

[0043] In the pH adjustment tank, use dilute HCl and the reflux water from the reactor to adjust the pH of the wastewater to 7.5. Then the wastewater flows into the air flotation tank by itsel...

Embodiment 3

[0046] The flow rate of p-aminodiphenylamine production wastewater in a chemical plant is 120 t / d, and the pollutant indicators before entering the process are: influent TOC is 59940 mg / L, formic acid concentration is 247000 mg / L.

[0047] In the homogeneous adjustment tank, p-aminodiphenylamine wastewater is mixed with nitrate-containing magnesium nitrate water, and a small amount of dilution water and USB reactor part of the reflux water are added to dilute the p-aminodiphenylamine wastewater, and the effluent of the homogeneous tank TOC is 1198.8 mg / L, formic acid is 4940.0 mg / L, and nitrate is 2654.5 mg / L. The C / N ratio in the wastewater is maintained at about 2.0. At the same time, 94 mg / L of urea and 3 mg / L of potassium dihydrogen phosphate are added to it. L (in PO 4 3- count).

[0048] In the pH adjustment tank, use dilute HCl and the effluent from the reactor to adjust the pH of the wastewater to 9.5. Then the wastewater flows into the air flotation tank by itself ...

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Abstract

The invention provides a method for accumulating nitrite nitrogen by performing short-cut denitrification on p-aminodiphenyl amine production wastewater. The method comprises the following steps of: mixing formic acid-containing wastewater generated in the p-aminodiphenyl amine production process with nitrate-containing wastewater and homogenizing, regulating the C / N ratio and the pH value of the wastewater, adding N and P nutritive salts, carrying out such treatments as sedimentation and air floatation, and then removing high-concentration organic matters out of the wastewater through an oxygen-poor short-cut denitrification reaction, and generating yielding water containing the nitrite nitrogen, which is advantageous for the subsequent anaerobic ammonia oxidation reaction. The method provided by the invention is low in investment, high in income, simple and convenient to operate and stable in treatment effect; besides, the generated wastewater can be further treated and utilized; and as a result, the purpose of reducing wastewater emission is reached and the economic benefit is improved.

Description

technical field [0001] The invention belongs to the technical fields of chemical industry and environmental protection, and relates to a treatment method of organic chemical wastewater, more specifically to a treatment method of p-aminodiphenylamine production wastewater. Background technique [0002] With the development of economy and society, the demand for rubber additives is increasing. p-Aminodiphenylamine, also known as 4-aminodiphenylamine, N-phenyl-p-phenylenediamine, trade name RT base, as a rubber additive The intermediate is an important dye and rubber auxiliary intermediate, and its main use is to produce rubber antioxidants 4010NA, 4020, 4010, etc. At present, in the tire manufacturing industry, only two products, 4010NA and 4020, account for more than 70% of the total amount of antioxidants. With the development of the automobile industry, the market demand for p-phenylenediamine antioxidants continues to grow. There are more than 10 kinds of synthesis proce...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 程学文王珺莫馗侯秀华张宾高凤霞
Owner CHINA PETROLEUM & CHEM CORP
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