A kind of treatment method containing para-ester wastewater

Abstract

Para-ester (also known as p-(β‑sulfate ethylsulfone) aniline) is an important intermediate for a wide range of reactive dyes. During the production of para-ester, a large amount of alkaline and acidic wastewater (about 30t wastewater / t product) is discharged. The composition of the wastewater is complex, and the concentration of COD is high. It is an organic chemical wastewater that is difficult to biodegrade. The present invention mixes acetanilide water, neutralization water, kettle residual water, and mother liquid water at a ratio of 1:8:3:8, pretreats through "catalytic micro-electrolysis + catalytic oxidation", and then enters "LH anaerobic + LH aerobic + BAF" biochemical treatment system, and finally through the "flocculation sedimentation + deep oxidation + clear water tank" post-treatment system. The invention has stable treatment effects, mild and stable reaction conditions, simple operation (for example, catalytic oxidation can be carried out at normal temperature and pressure, and the catalyst can be recycled), economical and reasonable operating costs, good treatment effects, less water consumption for subsequent biochemical dilution, and low treatment costs. Low, biochemical effluent can meet the national first-level discharge standards.

Description

technical field [0001] The invention relates to a treatment method for para-ester dye intermediate wastewater, in particular to a treatment method for para-ester dye intermediate wastewater with simple steps, less solid waste, and less dilution water. Background technique [0002] Para-ester wastewater is a kind of high-concentration organic chemical wastewater. It is a typical "three high and one difficult" fine chemical wastewater. Its water quality is complex, high concentration, poor biodegradability, and difficult to treat. The composition of the wastewater is complex, and the performance of the characteristic pollution factors is stable. The wastewater contains products, intermediates, raw materials and various by-products. The composition of the wastewater is complex, and the concentration of CODcr is extremely high, causing great pollution to the environment. [0003] For para-ester wastewater, Xu Ying et al. (Physicochemical-biochemical treatment of dye intermediate...

AI Technical Summary

Problems solved by technology

Although the treated water can meet the discharge standard, the COD of the source wastewater is low, only 5 000 mg / L, and the process is complicated, so the practicability is not strong

Zhang Tianyong et al. (Research on Photocatalytic Degradation of Para-ester Wastewater, Journal of Environmental Engineering, 2008) used photocatalytic technology to study only the physicochemical stage of the wastewater, and did not investigate the operation status of the biochemical stage

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