Treatment method of cellulose ethanol waste water

Abstract

The invention discloses a treatment method of cellulose ethanol waste water. The treatment method of the cellulose ethanol waste water comprises the following steps: pretreating the cellulose ethanolwaste water, performing the two-phase anaerobic-aerobic comprehensive treatment and electrochemical oxidation further treatment. By adopting the treatment method of the cellulose ethanol waste water,the COD value, the ammonium and nitrogen content and the sulfate content of the cellulose ethanol waste water can be greatly reduced, the content of side reaction products such as furan rings, furfural, formic acid, levulinic acid and the like, solids such as cellulose, lignin, semi-cellulose and the like as well as inorganic salts in the in the cellulose ethanol waste water can be reduced to be alevel not influencing the long-time operation and successful implementation of the waste water biochemical treatment system, the operation cost is low, the design is ingenious, and easy in maintenance can be achieved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating cellulose ethanol wastewater. Background technique [0002] In recent years, countries around the world have invested a lot of money in the research on the biochemical process of producing fuel ethanol with lignocellulose as raw material, and have achieved remarkable results in each process link, but the waste water (hereinafter referred to as fiber The problems of treatment and resource utilization of plain ethanol wastewater are also becoming more and more prominent. [0003] A variety of lignocellulosic raw materials are used in the production of cellulosic ethanol, and different lignocellulose pretreatment methods lead to a complex composition of cellulosic ethanol wastewater. Especially in lignocellulose pretreatment, the natural structure of lignocellulose is destroyed, many side reactions inevitably occur, and some side reaction products...

AI Technical Summary

Problems solved by technology

In addition to the strong inhibitory effect of these side reaction products on cellulase and fermenting microorganisms, affecting the conversion of lignocellulose and the final ethanol yield, these side reaction products enter the cellulosic ethanol wastewater without exception, and these The side reaction products are usually difficult to complete biodegradation in a short time, which reduces the biodegradability of cellulosic ethanol wastewater, which determines that the COD removal rate achieved by biochemical treatment will be much lower than that of ethanol wastewater produced from starchy materials. Achievable effect

Moreover, the COD value, ammonia nitrogen content and sulfate content of cellulose ethanol wastewater are very high, which greatly increases the wastewater load, and sulfate is easily reduced to hydrogen sulfide under anaerobic conditions, and hydrogen sulfide is poisonous to microorganisms. It can lead to direct poisoning and death of anaerobic methanogens, thereby significantly reducing the efficiency of anaerobic treatment and further increasing the burden of subsequent aerobic treatment and advanced treatment

At the same time, cellulosic ethanol wastewater contains some refractory biodegradable substances such as cellulose, lignin, and hemicellulose, and the solid content in the mash is extremely high, and it is not easy to stratify, difficult to separate, and the content of inorganic salts also greatly exceeds the conventional The scope of biochemical treatment also greatly increases the difficulty of the treatment of cellulosic ethanol wastewater