Re-utilization of waste liquid and distillers' grains from alcohol production

Abstract

Reutilization of alcohol and grain effluent is carried out by passing grain effluent to solid-liquid separator by distilling tower, entering the separated effluent into grain effluent neutralizer, delivering the neutralized grain effluent into efficient grain effluent deposition tank by transfer pump, entering deposited supernatant into pre-process to produce alcohol by transfer pump, separating out grain as feed by solid-liquid separator and delivering deposit into anaerobic jar to produce marsh gas. The equipments consist of solid-liquid separator, grain effluent neutralizer, efficient grain effluent deposition tank and transfer pump. It's simple, cheap, fast, has no environmental pollution and saves energy resources.

Description

technical field [0001] The recycling technology of alcohol distiller's waste liquid of the present invention relates to the process technology of distiller's grain wastewater treatment, in particular, a process for the treatment and reuse of alcoholic distiller's waste liquid. Background technique [0002] The alcohol industry is an important industry in the development of the national economy. In the process of producing alcohol, a large amount of distiller's grain waste liquid will be produced, which is a typical high-concentration organic waste water. At present, many domestic alcohol production enterprises have adopted anaerobic and oxygen-consuming treatment process for distiller's grain waste liquid. Although this process produces usable biogas energy, it is still difficult to realize the discharge of waste water up to the standard. The general investment cost and Running costs are high. The Chinese patent 91103002.6 "Alcohol distiller's grain waste liquid treatment ...

AI Technical Summary

Problems solved by technology

The Chinese patent 91103002.6 "Alcohol distiller's grain waste liquid treatment process" adopts a one-time solid-liquid separation of the neutralized distiller's grain waste liquid. Due to the limitation of the separation mechanical properties and separation effect, the distiller's grain after the initial separation is often The solid content in the waste liquid is too high. If it is directly used as the feed water for alcohol production, it cannot meet the requirements of the water consumption index.

Another Chinese patent has been published 92107582.0 "Secondary Separation of Distiller's Grains Wastewater No Discharge Process". Although this process overcomes the problem that the above-mentioned process uses the first separation of distiller's grains waste liquid, it also has the disadvantage of secondary separation. The intermittent filter used takes a long time to filter, and the filtered liquid is easily polluted by bacteria. If such liquid is reused, it is also detrimental to the yield and quality of alcohol production.

It can be seen that, due to the difficult operability of the process and equipment in the above two processes, no enterprise has been able to effectively realize this technology so far.

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