Whole-process nylon 66 salt production wastewater treatment method

Abstract

The invention relates to a wastewater treatment method for whole-process nylon 66 salt wastewater production, which comprises the following steps: mixing wastewater generated by each production and synthesis device in the whole-process nylon 66 salt production process, feeding into a homogenizing regulating tank, regulating the pH value, and feeding into a biological selector. The wastewater sequentially passes through a synchronous nitrification and denitrification reactor, a sedimentation tank, a coagulating sedimentation tank, a front catalytic ozonation tank, an air stripping tank, an anoxic tank A1, an aerobic tank O1, an anoxic tank A2, a membrane bioreactor, a rear catalytic ozonation tank, an activated carbon filter, a security filter, an ultrafiltration device and a reverse osmosis device, and finally produced water is used for production or further treatment. The whole-process nylon 66 salt production wastewater treatment method provided by the invention has the advantages of mature process technology, flexible process, guaranteed effluent quality, reuse of produced water and development of circular economy. Meanwhile, part of carbon sources and energy consumption are saved. And the occupied area is smaller than that of the traditional process.

Description

technical field [0001] The present application relates to the technical field of wastewater treatment, in particular to a method for treating wastewater from the production of nylon 66 salt in a whole process. Background technique [0002] Nylon 66 salt is the raw material of synthetic fibers, which can be used to produce civilian silk, industrial silk, carpet silk, etc. Nylon 66 salt is also the main raw material of engineering plastics, used to produce mechanical parts, bearing gears that need self-lubrication, and can also replace non-ferrous metals The material serves as the casing of the machine. Nylon 66 engineering plastic has many advantages such as low density, stable chemical properties, good mechanical properties, superior electrical insulation properties, and easy processing and molding. It is also widely used in industrial fields such as automobiles, electronic appliances, and mechanical instruments. [0003] The production technology of adiponitrile, the key r...

AI Technical Summary

Problems solved by technology

The wastewater produced contains organic pollutants with high concentrations of benzene series such as sodium cyanide, pentenenitrile, 2-methyl-3-butenenitrile, hexamethylenediamine, adipic acid, cyclohexane, etc., and has poor biodegradability , higher biological toxicity and worse water quality

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