Method for treating p-aminodiphenylamine production device wastewater

Abstract

The invention provides a treatment method of p-aminodiphenylamine production device wastewater, particularly a high-efficiency treatment method of process wastewater containing high-concentration formic acid. The method comprises the following steps: homogenizing the p-aminodiphenylamine production device wastewater, regulating the pH value, controlling the C / N ratio, precipitating, adding N and P nutritive salts, regulating the influent water temperature, carrying out biochemical denitrification treatment and the like. After the p-aminodiphenylamine production device wastewater is treated by the treatment procedure provided by the invention and corresponding conditions, the formic acid concentration in the wastewater can be lowered from 160000 mg / L or so to 0.1 mg / L below, and the removal ratio is up to higher than 90%. The method has the advantages of stable treatment effect and low treatment cost, is simple to operate, and can easily implement industrial application.

Description

technical field [0001] The invention relates to a method for treating organic chemical wastewater, in particular to a method for treating organic chemical wastewater with high COD and high formic acid concentration, in particular to a method for treating wastewater from a p-aminodiphenylamine production device. Background technique [0002] 4-Aminodiphenylamine (also known as p-aminodiphenylamine, N-phenyl-p-phenylenediamine), trade name RT base, is an important dye and rubber additive intermediate, which is mainly used in the production of rubber anti-aging Agent 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 synthetic processes of RT base at home and abroad, and there are mainly 4 process routes for indust...

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Problems solved by technology

But this method also has following problems: first, in the process that chlorine is continuously passed into inorganic alkali aqueous solution, unavoidably there will be some chlorine gas to leak in the middle of the air, easily causes air pollution; The national discharge standard is not met; finally, whether there are other pollutants in the treated wastewater, the patent does not mention

There are some following problems in this method: First, although the recovery process of formic acid in waste water is described in detail in this patent, whether the waste water after treatment contains other pollutants, this patent does not mention

Secondly, the process of recovering formic acid in this method is very cumbersome, not only need multiple sets of reactors to precipitate calcium formate to prevent excessive formic acid from leaking, but also to add a variety of materials such as Na 2 Additional agents such as S and PAC increase the processing cost

[0005] The methods described in the above two patents all need to add medicaments. For example, Chinese patent CN101492193A needs to add chlorine gas and hydrochloric acid during the treatment process, and Chinese patent CN101200423 needs to add PAC coagulant and sodium sulfide during the treatment process, thereby increasing the treatment cost.

[0006] To sum up, the pretreatment of waste water containing formic acid by physical and chemical methods consumes a lot of energy. The chemical oxidation method needs to add chemical oxidants to achieve the purpose of sewage treatment. The cost of sewage pretreatment is relatively high. An effective method to reduce the content of organic matter in the medium to the desired level (such as achieving TOC compliance)

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