Efficient decolorization process for wastewater generated by brewing of white spirit

Abstract

The invention relates to an efficient decolorization process for a wastewater generated by brewing of white spirit. The process comprises the following steps: a brewing wastewater enters into an anaerobic tank after pretreatment, most of organic matters and a part of chromaticity are removed under the action of anaerobic microorganisms, and then enters an aerobic tank to further carry out oxygenolysis; a mixed liquor of the aerobic tank enters into a membrane bioreactor to carry out solid-liquid separation; suspending activated sludge in the mixed liquor is intercepted, so as to obtain clear water of which the turbidity is smaller than 1NTU; and finally membrane separation is carried out through a nanofiltration membrane or ultrafiltration membrane filter device, wherein the chromaticity of the clear water after membrane separation is 2-4 times, and superior to the 20-fold limiting value specified by the national standard GB27631-2011 table 3; and concentrated water after membrane filtration returns to an anaerobic and aerobic membrane bio-reactor (MBR) biological treatment system to continue to process. The decolorization process adopted by the invention can be designed in a modularized manner, is less in floor area, low in operating cost, and convenient to be accessed into the existing wastewater biological treatment system, and has important significance on upgrading and reconstruction of the existing white spirit wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment process for highly efficient decolorization and organic matter removal of liquor brewing wastewater. Background technique [0002] In the brewing process of Maotai-flavored liquor, due to the repeated fermentation and distillation, the discharged wastewater has a higher chroma. It is difficult for the biochemical treatment process to reduce the chroma to less than 20 times as specified in Table 3 of the "Discharge Standard of Water Pollutants for Fermented Alcohol and Liquor Industry" (GB 27631-2011), and sometimes even 40 times as specified in Table 2. Decolorization is a long-standing and difficult problem in the treatment of Maotai-flavor liquor wastewater. After testing, commonly used decolorization treatment processes include oxidation (such as ozone, Fenton's reagent, hydrogen peroxide), reduction (sodium sodium sulfite, ferrous sulfate...

AI Technical Summary

Problems solved by technology

After testing, commonly used decolorization treatment processes include oxidation (such as ozone, Fenton's reagent, hydrogen peroxide), reduction (sodium sodium sulfite, ferrous sulfate, etc.), coagulation (organic or non-polymer decolorizing agent, composite decolorizing agent) can not achieve the ideal decolorization effect, activated carbon adsorption has a certain decolorization effect, in the early stage of liquor production, when the chroma of wastewater is low, the chroma can generally be treated to less than 20 times, in the later stage of liquor production, the chroma of wastewater discharged When it is darker, it is difficult to stabilize the chromaticity below 20 times, and it has the disadvantages of easy saturation, high cost, and difficulty in regeneration, making it difficult for engineering application

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