Research On The Biological Treatment Technology Of Cellulosic Ethanol Wastewater

This paper describes the wastewater treatment methods,which is produced in the new energy of cellulosic ethanol production, involving both new energy industry and environmental engineering industry. Because of the energy crisis, the search for new energy sources is becoming the focus of attention. In all the material obtained from plants, particularly, ethanol attracts people's concern, which is the most promising liquid fuel coming from renewable resources, but currently biological production of ethanol primarily from sugar and starch fermentation, facing the rapid expansion of the world's population and food shortages, the development of alcohol produced with grain will be restricted. As the advent of global energy crisis, food crisis and environmental crisis, cellulosic ethanol has drawn worldwide attention. Because of the complexity of the chemical structure of Straw cellulosic ethanol in which cellulose and hemi cellulose not only have been wrapped lignin,but also covalently with cellulose,with highly ordered crystal structure, it must be pretreatmented to damage crystal structure, reduce the degree of polymerization. The steam explosion pre-treatment technology is used. The waste water from Ethanol production contains some cellulose,lignin, hemicelluloses and so on,which is difficult to be degraded.The condensate from Ethanol production contains a large number of volatile acid, furfural and volatile phenols.In the paper, filtrate from Ethanol production pretreatment process is as the object, carryed out small scale testing, pilot testing, and the results have been used to the engineering and the processing 800t/d sewage treatment project was builted,which has achieved the following research results:(1) In the experiment, we used the immobilized white-rot fungi on the filtrate from cellulosic ethanol steam explosion frame filter press process t. In the course of the experiment, we studyed the treatment effect impact of pH, residence time, and dosing rumen micro-organisms, and the results will help lay the foundation. for cellulosic ethanol processing.(2) In the experiment, we can select the appropriate technology for pre-processing system, biochemical, in-depth processing. We compared some pretreatment technology, flotation, micro-electrolysis/H2O2, Fenton reagent catalytic oxidation; and compared to anaerobic, aerobic biological treatment of wastewater. Through the experimental comparison, we determined it was feasible which was the use of micro-electrolysis+anaerobic+aerobic experimental device for wastewater treatment, and the system has a strong ability for the impact load;We explored the depth of processing for wastewater, contrasted the removal effect of the coagulation and sedimentation, ClO2 catalytic oxidation, Fenton's reagent oxidation, Fenton's reagent oxidation catalytic oxidation +contact oxidation, after Fenton's reagent oxidation the COD removal is 50%, waste water biodegradability increase.(3) In the system, we used pilot treatment for wastewater from cellulosic ethanol production, studyed the treatment effect and the impact of treatment effect by COD load, residence time, pH and thus the optimum running COD load, residence time, pH, provide guidance to the wastewater treatment engineering.(4) This system is based on the aforementioned and technical feasibility studies and research by Nanyang, Henan one Group of cellulosic ethanol and treatment of the filtrate and the comprehensive wastewater using an aerobic pretreatment+UASB+ first aerobic reactor+oxidation+combined aerobic contact oxidation treatment process, and build waste water treatment engineering. During debugging wastewater treatment, the initial trial keep a relatively stable operation, and the effluent wastewater can achieve the discharge standards; in the treated wastewater through an aerobic biodegradability is poor, but when it have the catalytic oxidation of Fenton's reagent, wastewater biodegradability will increased, and provide the conditions for follow-up contact oxidation; contact oxidation after catalytic oxidation can be used to further reduce wastewater pollutant concentrations,the wastewater will achieve discharge standards.(5) According to microorganism growth picture condition analysis, the result indicated Rumen micro-organisms reduce start time of aerobic and strengthen processing effect; white-rot fungi promote formation of Fungus rubber group and enhance processing effect.(6) Because of the high concentrations of pollutants in wastewater, handling is difficulty, the project used several steps, and the costs of the wastewater operating are high, about 3.56 yuan/t.(7) In this paper, wastewater which is produced in the new energy of cellulosic ethanol production product methane in the process of anaerobic and it Settles foundation for natural fiber raw material Biomass for full used.