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: firstly, mixing and homogenizing the p-aminodiphenyl amine production wastewater and phenylamine production wastewater; then allowing the wastewater to enter a pH regulation tank, successively adding Fe-containing chlorobenzene acidic wastewater, a nitrate-containing solution or wastewater, alkaline denitrification backflow water and dilution water, and finally, adding an acid to adjust the pH value; allowing Fe in the mixed wastewater to form a flocculant Fe(OH)3, and carrying out precipitation treatment; then further removing impurities in an air flotation tank; allowing effluent in the air flotation tank to enter a homogeneous adjusting tank, and adding N and P nutritive salts; finally, removing high-concentration organic compounds in the wastewater through a denitrification reaction; and carrying out a nitration reaction by using the alkalinity generated in the denitrification process to remove ammonia nitrogen in the wastewater, and reaching standards to discharge. The treatment method has the advantages of less investment, high income, simple operation, and stable treatment effect; and the produced wastewater can be further treated and utilized, not only is the purpose of reducing wastewater emissions achieved, but also economic benefits are improved.

Description

technical field [0001] The invention relates to the treatment of organic chemical wastewater in the technical fields of chemical industry and environmental protection, in particular to a method for treating ammonia nitrogen-containing 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 p-phenylenediamine antioxidants (for example: rubber antioxidant 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 g...

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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 method used in the prior art consumes a lot of energy for the 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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