Treatment method of organic silicon production wastewater

Abstract

The invention discloses a treatment method of organic silicon production wastewater. The treatment method comprises the following steps: introducing organic silicon wastewater into an air floatation process, removing the floating oil in the wastewater, collecting the floating oil, returning to a production recovery process so as to be treated, introducing air floatation effluent into a pH regulating tank, regulating the pH value to 3-4, introducing into a Fenton oxidation tank, adding a ferrous sulfate solution and hydrogen peroxide, and carrying out a Fenton oxidation reaction; introducing the wastewater after Fenton oxidation into multi-effect evaporation, evaporating to remove the salt, pumping the evaporation condensate into a biochemical system, and carrying out biodegradation on theorganic matters in the wastewater by using an active sludge method and adopting facultative anaerobic hydrolysis and continuous aerobic treatment processes; and externally transporting the residual sludge, carrying out mud-water separation on biochemical aerobic effluent, carrying out hydrogen peroxide-ozone coupling oxidation on the supernatant to finally achieve the COD of smaller than or equalto 60 mg / L.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a method for treating organic silicon wastewater. Background technique [0002] Organosilicon monomers and downstream products of organosilicon. The wastewater produced by organosilicon mainly contains methanol, methyl chloride, organohalosilane, high polymer silicone oil, silicone resin, silicone rubber, silicon intermediates and other substances. The water contains a large amount of chloride ions. Poor biodegradability. The main process principle of organosilicon production in the prior art is as follows: synthesis of monochloromethane - synthesis of dimethyldichlorosilane monomer - hydrolysis of dimethyl monomer - cracking and rectification of siloxane. From the perspective of the entire production process, the production of organic silicon uses methanol, hydrogen chloride and silicon powder as raw materials, and zinc, copper, etc. as catalysts. However, there is no chlorine ...

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Problems solved by technology

3. Characteristics of organic pollutants The pollutants have obvious properties and contain silicon elements. Among them, the silicon-oxygen bond energy is large, and it is difficult to break the chain of biodegradation. It always exists in the water body and cannot be completely degraded. If the silicon element in organic silicon is not completely degraded , there will be a higher COD value in the wastewater, making it difficult for the effluent to reach COD≤60mg / L

Due to the relatively high concentration of non-biodegradable organic silicon components in the raw wastewater, especially the structure of siloxane is more stable than other organic substances, and silicon oxygen is difficult to break, the amount of ozone in the first stage is difficult to achieve the cracking of siloxane, and the second Due to the high chlorine in the water, the ozone free radicals will be annihilated, and the siloxane in the wastewater will always exist in the water body, which will consume more ozone. Based on the above factors, it is difficult to stably achieve COD≤60mg / L

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