Treatment process for degradation-resistant organic wastewater containing aniline high-salt content

Abstract

The invention discloses a treatment process for degradation-resistant organic wastewater containing aniline high-salt content, and relates to the technical field of the chemical wastewater treatment.The technical problem of removing the aniline and other degradation-resistant substances exist in the wastewater under the high-salt condition in the prior art is solved. The treatment process comprises the following steps: performing Feton II strong oxidation reaction treatment on the degradation-resistant organic wastewater containing aniline high-salt content, and then performing salt-evaporation treatment through a MVR evaporator; treating the wastewater after salt-evaporation in strict accordance with the order of entering a hydrolysis acidification pool to perform anaerobic reaction andentering an aerobiotic pool to perform the aerobiotic reaction, precipitation and MBR filtering, wherein the second-order reactions of different anaerobe populations are arranged in the hydrolysis acidification pool, the aerobiotic reaction in the aerobiotic pool comprises the forepart aerobiotic reaction and the posterior aerobiotic reaction with different dissolved oxygen. By implementing the technical scheme disclosed by the invention, the aniline and other degradation-resistant substance in the wastewater under the high-salt condition can be effectively removed, the influence on the salt-evaporation equipment by organic substance in the wastewater is reduced, and the treatment effect is obvious.

Description

technical field [0001] The invention relates to the technical field of chemical wastewater treatment, in particular to a treatment process for refractory organic wastewater containing aniline and high salt content. Background technique [0002] As the country pays more and more attention to environmental protection issues, the requirements for the discharge of chemical wastewater are becoming more and more stringent. The national "Petrochemical Industry Pollutant Discharge Standard", "Water Ten Articles", Henan Province "Clear Water Project", "Chemical Industry Water Pollutants Indirect Discharge Standards and other national and local norms and standards have been promulgated and implemented successively, and have put forward clear discharge requirements for organic substances such as benzene series in chemical industry wastewater. May be promoted to a higher level. [0003] Aniline is alkaline and easily forms salts with acids. The hydrogen atom on the amino group can be ...

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Problems solved by technology

[0008] 4. Aniline wastewater has strong acidity or alkalinity, which not only increases the cost of wastewater treatment, but also increases the salt content in wastewater;

However, benzene substances are generally highly toxic, causing great damage to microorganisms, making it extremely difficult for microorganisms to survive, and the treatment effect is poor

Moreover, aniline is difficult to degrade, and there are many limitations in the treatment of aniline wastewater by biotechnology; especially the high salt in the high-salt wastewater produced by the chemical industry is fatal to microorganisms. Therefore, microbial methods are not suitable for this type of sewage

[0013] (3) Chemical method: Chemical method is generally divided into photocatalytic oxidation method, electrochemical method and strong oxidation method; photocatalytic oxidation method has higher requirements on the water quality of the treated object, and is generally used for the treatment of low-concentration organic matter, and is rarely used alone, and High energy consumption and high cost; the electrochemical method has a poor treatment effect on benzene series, and it is not easy to break the benzene ring structure; the strong oxidation method is currently a more mature and refractory organic treatment method.

This technical scheme can significantly reduce the COD and aniline content of aniline wastewater through the combination of polycondensation reaction-Fenton-NaClO oxidation technology; However, the wastewater containing aniline and high salt content produced by the chemical industry is very likely to have an impact on the salt steaming equipment and biochemical systems, and the waste salt contains aniline, which is hazardous waste and cannot be reused

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