Method for treating ammonia-nitrogen containing p-aminodiphenyl amine production wastewater

Abstract

The invention relates to a method for treating ammonia-nitrogen containing p-aminodiphenyl amine production wastewater. The method comprises the steps: carrying out pH adjustment on the p-aminodiphenyl amine production wastewater, mixing and homogenizing with phenylamine production wastewater, then adding nitrate-containing wastewater into a homogeneous adjusting tank, completing adjustment of the C / N ratio and the pH value of the mixed wastewater in the homogeneous adjusting tank, next adding N and P nutritive salts into the homogeneous adjusting tank, if effluent of the homogeneous adjusting tank contains more waste residue quantity, requiring to carry out precipitate air flotation treatment on the effluent of the homogeneous adjusting tank, then removing high-concentration organic matters contained in the effluent of the homogeneous adjusting tank through a denitrification reaction, and finally, carrying out a nitration reaction by using the alkalinity generated by the denitrification process to remove ammonia nitrogen in the denitrification reaction effluent. The wastewater treatment method can effectively reduce the organic matters and ammonia nitrogen in the wastewater, substantially cuts down the total amount of pollutants discharged to the environment by a p-aminodiphenyl amine production device, and makes the wastewater reach standards and discharged.

Description

technical field [0001] The invention relates to the treatment of organic chemical wastewater, in particular to a method for treating ammonia nitrogen-containing p-aminodiphenylamine production wastewater. In particular, it refers to a method for denitrifying and nitrifying p-aminodiphenylamine wastewater containing ammonia nitrogen to remove organic matter and ammonia nitrogen, and the p-aminodiphenylamine wastewater contains high-concentration formic acid. 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 p-phenylenediamine antioxidants (for example: rubber antioxidant 4010NA, 4020, 4010, etc.). At present, in the tire manufacturing industry, only two products, 4010NA and 402...

AI Technical Summary

Problems solved by technology

But this method also has some following problems: first, in the process that chlorine is constantly fed into the inorganic alkali aqueous solution, some chlorine gas will inevitably leak into the air, which will easily cause air pollution; secondly, after being treated by this method, the COD content in the wastewater The national discharge standard has not yet been met; moreover, whether there are other pollutants in the treated wastewater, the patent does not mention

There are some problems in this method: firstly, although the recovery process of formic acid in waste water is described in detail in this patent, whether the treated waste water contains other pollutants is not mentioned in this patent; secondly, the process of recovering formic acid in this method It is very cumbersome, not only need multiple sets of reactors to precipitate calcium formate to prevent the leakage of too much formic acid, but also to add a variety of materials such as Na 2 Additional agents such as S and PAC increase the processing cost

[0006] To sum up, the physical and chemical methods used in the prior art consume a lot of energy for pretreatment of formic acid-containing production wastewater. The chemical oxidation method needs to add chemical oxidants to achieve the purpose of sewage treatment, and the cost of sewage pretreatment is relatively high.

The proposed wastewater reuse point is only in principle, and there is basically no mention of how to deal with the wastewater that needs to be discharged, especially the high-concentration toxic or refractory wastewater.

At present, there is still a lack of methods that can effectively remove organic matter in formic acid-containing wastewater, and there is still a lack of complete and effective means to achieve the standard discharge of ammonia nitrogen-containing p-aminodiphenylamine production wastewater

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