Process for processing high concentration refractory organic wastewater containing paratoluidine

Abstract

The invention relates to a treatment process of paratoluidine-containing high-concentration hard-to-degrade organic wastewater. The treatment process comprises the following steps: physiochemical pretreatment: by the wastewater collection and control, the mechanical oil removal, the pH regulation, the micro-electrolysis reaction and the neutralization and settlement, most of chemical oxygen demand (COD) of wastewater is removed and the biodegradability of wastewater is improved; microbial anaerobic hydrolysis acidification treatment: after the physiochemical pretreatment, the wastewater undergoes the facultative hydrolysis and acidification using the cultured domesticated microorganisms, so that the macromolecular organic substances are degraded, the biodegradability is further improved, the COD of wastewater is partially removed, and the sludge is separated; two-stage aerobic biochemical treatment: the compressed air is introduced, the pH value is regulated, and the pollutants such as COD residues and suspended substances (SS) are removed; and deep oxidation treatment: Fenton reagent is adopted in the deep oxidation treatment, colority and COD are further removed, the neutralization, coagulation and settlement is carried out, the settled materials are collected, and the treatment effluent meets the standards and is discharged or recycled in the production process. The invention has the characteristics of simple and easy operation and easily-accessible low-price treatment agents.

Description

1. Technical field [0001] The invention relates to a chemical wastewater treatment technology, in particular to a treatment process for high-concentration p-toluidine-containing refractory organic wastewater, which is suitable for fine chemical, pharmaceutical, papermaking, printing and dyeing and other industries. 2. Background technology [0002] At present, the more advanced and commonly used copper extraction and mineral processing agents are synthesized and compounded from raw materials such as nonylphenol, p-toluidine, formaldehyde, propionyl chloride, anhydrous aluminum trichloride and hydroxylamine hydrochloride, and produce odor during the production process. High-concentration, refractory acidic organic wastewater with high concentration, large chroma, slick oil, and complex components. After testing, the content of toluidine in this type of wastewater is 3000-4500mg / L, and the content of potassium dichromate oxidized chemical oxygen demand (CODcr) 8000~12000mg / L, ...

AI Technical Summary

Problems solved by technology

If effective control and treatment are not carried out, serious ecological environmental pollution will be caused, which not only restricts the sustainable development of the above industries, but also is the key to whether the water pollution situation can be completely changed.

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