The Process Design Of Methane Production With Wastewater Produced From Cellulosic Ethanol Process Process

The energy problem is an important theme of sustainable development. With the development of economy, the problems of energy shortage and environment pollution get more and more prominent. Research on cellulosic ethanol has currently become the focus of the new resource strategy of the nations all over the world. China is also vigorously to develop non-staple ethanol. Henan Tianguan Group Co. Ltd had completed the technology research of the ten thousand tons of cellulosic ethanol, and set up a project of cellulosic ethanol producing 30000 tons ethanol. But during the production of the multi-stage utilization, improving the economic efficiency need do depth development and utilization of wastewater produced from cellulosic ethanol process. The recycling technology of wastewater produced from the traditional processing of ethanol production has been matured in Henan Tianguan Group Co., Ltd. However, technical innovation still need to be researched in the industrialization process.After the key techniques was studied which were fermented liquid reflux circulation technology and the process of solid fermentation technology of biogas production used wastewater produced from cellulosic ethanol process, the secondary energy gradient process of ethanol-biogas production could be realized and improve energy conversion rate of raw materials. The study could provide the technological support for the development of green circular economy.Gradient experiment of single factor was carried out to select the conditions of biogas fermentation used liquid waste produced from cellulosic ethanol process, which were inoculation rate 20%, total solids (TS) 12%,12% cow dung of or 10% pig manure as nitrogen source.Orthogonal experiment was designed on the basis of preliminary experiments validate to improve the results of preliminary experiment. Used liquid waste as raw material of orthogonal experimental, the fermentation conditions were inoculation rate 20%, loading rate 90%, TS 12% and cow dung 10%.In the fermentation condition, the rate of gas production is 15.37 L,volume rate of gas production is 6.83 L/L, the utilization rate of material is 44.1%.With solid waste as the raw material, the results showed that the fermentation conditions were inoculation rate 30%, loading rate 90%, TS 12% and cow dung 10%.In the fermentation condition, the rate of gas production is 15.085 L,volume rate of gas production is 6.7 L/L, the utilization rate of material is 45.9%.With wastewater as raw material, the fermentation conditions were inoculation rate 20%, loading rate 90%, TS 12% and cow dung 4%.In the fermentation condition, the rate of gas production is 31.577 L,volume rate of gas production is 14.03 L/L, the utilization rate of material is 49.5%.Pilot is the intermediate links to turn the laboratory results into industrial production as the simulation of industrial production. Based on calculation and analysis of results from three orthogonal experiments, under pH 7.5, the best conditions of gas production is inoculation rate 20%, loading rate 90%, TS 12% and cow dung 4%. The pilot device was made for anaerobic fermentation of biogas by our research group. Under the optimized condition of fermentation parameters,the fermentation processes of machine + reflux mixed stirring (MRMS) and mechanical stirring (MS) were compared. Conclusion, the production rate of biogas using MRMS is higher 41.2% than that of MS with the gas volume rate,13% with high material utilization ratio. COD removal rate and TN removal rate was increased 10.3% and 9.1% with MRMS, respectively.