Method for treating waste water generated in production process of alcohol by fermenting

Abstract

The invention discloses a method for treating waste water generated in the production process of alcohol by fermenting. The method comprises the following steps of: (1) performing high-temperature contact type anaerobic fermentation on the generated alcohol waste water; (2) performing centrifugal separation; (3) performing medium-temperature combined upflow anaerobic sludge blanket (UASB) anaerobic fermentation on the clear solution obtained through separation; (4) separating methane, sludge and clear solution from the waste water subjected to anaerobic fermentation under the action of a triphase separator on the upper part of an anaerobic fermentor; (5) performing sequencing batch reactor (SBR) normal-temperature oxygen-consuming fermentation on the clear solution obtained through separation in the step (4), settling again after fermentation, and separating out the clear solution; and (6) applying the clear solution obtained through separation in the step (5) to alcohol process recycle. In a 'waste water and waste treatment-resource comprehensive utilization' circular economy standardization system established by the invention, natural resources and secondary energy sources are utilized reasonably by comprehensively utilizing resources, saving energy, reducing consumption and saving water, so that the natural resources and the energy sources can be utilized most reasonably and discharge of wastes and pollutants can be reduced.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a treatment method for waste water produced by fermenting alcohol in an alcohol plant. Background technique [0002] In alcohol production, water is an important raw material. According to different raw materials (cassava, corn, barley and rice, etc.), the proportion of water added varies, generally about 3 times the total amount of raw materials. Taking an alcohol factory with an annual output of 100,000 tons as an example, the annual consumption of process water is more than 1 million cubic meters, and the annual production of alcohol wastewater is about 1.3 million cubic meters. [0003] In order to save resources and improve the comprehensive utilization of resources, my country also has clear requirements for the resource consumption indicators of the alcohol industry. According to the GB / T18916.7-2004 standard, there are better requirements for alcohol water intake quotas (incl...

AI Technical Summary

Problems solved by technology

[0005] Alcohol wastewater is a kind of high-concentration organic wastewater with a COD content as high as 50,000 to 70,000 mg / L. If it is directly discharged into the external environment, it will seriously cause eutrophication in the water body and pollute the environment.

Given that alcohol production consumes too much water

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