High-concentration nonionic surfactant wastewater treatment device and method

Abstract

The invention relates to the field of surfactant wastewater treatment, particularly to a high-concentration nonionic surfactant wastewater treatment device and method. According to the invention, a physicochemical combined process of coagulation chemical precipitation, dissolved air flotation, three-stage microelectrolysis, Fenton oxidation and the like is adopted, so nonionic surfactants in wastewater are effectively removed, the content of COD is also greatly reduced, and the requirements of a biochemical pool on inflow water are met; and a combined process of treatment with a UASB anaerobicsludge bed reactor, hydrolysis acidification and aerobic contact oxidation is performed subsequently, so the content of CODs in a water body is significantly reduced, and effluent meets national andlocal water quality emission standards.

Description

technical field [0001] The invention relates to the field of surfactant wastewater treatment, in particular to a high-concentration nonionic surfactant wastewater treatment device and method. Background technique [0002] Surfactants have high surface activity, can reduce the surface tension of solvents and modify the internal molecular combination of solutions, etc., which improve product performance and production processes, so they are widely used in industrial production. Among them, nonionic surfactants are widely used in textile, paper, food, cosmetics and other industries, but at the same time, alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether and fatty acid methyl ester polyoxyethylene ether on the market Non-ionic surfactants are all biodegradable substances. When they enter the water, they will cause foaming on the water surface, reduce the self-purification ability of the water body, and deteriorate the water quality. Therefore, the treatment...

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Problems solved by technology

However, the treatment effect of a single process is not ideal, and some processes still have the problem of difficult follow-up processing

Chinese patent application CN1644536A achieves the purpose of water purification through the three-stage treatment of mesh coarse filtration-membrane microfiltration-membrane nanofiltration. This process has less pollution, does not need to add chemicals during the treatment process, and is easy to operate; but both microfiltration & nanofiltration units need pressure pumps. To provide power, the mechanical properties of the membrane and the anti-seepage effect of the equipment are relatively high, and the cost is expensive

Chinese patent application CN104386852A is aimed at high-concentration surfactant wastewater, through the combined process of acidolysis-extraction-coagulation sedimentation, the COD removal rate can reach more than 90%; but the acidolysis stage needs to reduce the pH to about 1, the dosage More, not suitable for large-scale applications, and the extraction agent used in the extraction stage is chloroform, which is easy to decompose when exposed to light, has toxicity and carcinogenicity, is inconvenient to operate and store, and may cause secondary pollution

Chinese patent application CN107935236A removes surfactants in wastewater by adsorbing material adsorption and foam flotation; but the amino-modified SiO in the adsorbing material particles 2 、TiO 2 Or organic resin, the preparation method is more complicated, not cheap and easy to get, and how to deal with the adsorbed material has not been explained, which may cause secondary pollution

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