Study On Aerobic Hydorlysis Characteristic Of Corn Straw

The limiting step on treatment of straw biogas is lignocellulose hydrolysis. The main factor of hindering hydrolysis is destroy the shielding function of lignocellulose effect on the cellulose and hemicellulose, and the degradation of lignin must oxygen condition. Therefore, in order to improve corn stalk biocompatibility, it needs to aerobic hydrolysis preprocessing before anaerobic fermentation to corn straw. In this study,firstly,in different aerobic hydrolysis temperature and aerobic hydrolysis time conditions for wet aerobic hydrolyzing corn stalk. Preliminary discussion on hydrolysis temperature, hydrolysis time of corn stalk in the impact of the degradation of lignocellulose.Secondly, in order to further investigate wet aerobic hydrolysis treatment impacts of corn straw anaerobic fermentation gas rate, under the condition of the medium temperature, the hydrolysis of corn straw anaerobic fermentation experiment was carried out. Finally, because of the different parts and the components of different height difference is bigger of corn stalk, Contrast analysis was carried out on the hydrolysis properties and gas properties between directly anaerobic fermentation and hydrolysis aerobic-anaerobic fermentation with different positions of the corn stalk. For rapid degradation and efficient use of corn stalk,to provide theoretical basis and technical support.The main research contents are given as follows:(1)Aerobic hydrolysis experiment with the reaction system TS is 10%; aerobic hydrolysis temperature is 35℃,38℃,41℃,44℃,47℃; aerobic hydrolysis time is 8h,16 h,24h,32 h,40h. The results showed that lignocellulose structure of corn straw is damaged by aerobic hydrolysis,the degradation rate of the lignocellulose is higher. And the appropriate reaction temperature rising, can accelerate the process of reaction. In the aerobic hydrolysis temperature is 44℃,aerobic hydrolysis time is 8h conditions that lignin degradation by 15.79%, account for 49.50% of aerobic hydrolysis 40 h. In this condition, for the reaction system mixing gas make extracellular enzyme with good contact with the substrate fermentation, to improve the hydrolysis rate and hydrolysis time. Shorter anaerobic hydrolysis time and higher water content can effectively control the degradation of corn straw. Because of the lignin shielding effect of cellulose and hemicellulose, the degradation of cellulose and hemicellulose lag the lignin,so not cause excessive degradation of corn straw, also can obviously reduce the hydrolysis time. Under the optimum conditions,loss of the total organic compounds is only 4%.(2)Aerobic hydrolysis- anaerobic fermentation experiment with the reaction system TS is 10%,aerobic hydrolysis temperature is 44℃; aerobic hydrolysis time is 8h,16 h,24h,32 h,40h. Results show that wet hydrolysis aerobic supplemented by stirring with corn straw, which can effectively improve corn straw anaerobic fermentation gas production and methane from production of the unit mass of corn stover,especially in the anaerobic fermentation medium and late,this phenomenon is especially obvious. The highest biogas yield and methane yield of TS increased by 28.4 % and 29 % respectively than the anaerobic fermentation without any aerobic hydrolysis treatment. It provides a good substrate conditions conditions to the follow-up the anaerobic methane fermentation.(3)According to different parts ang different height of corn straw to segment, and aerobic hydrolysis- anaerobic fermentation experiment with the reaction system TS is 10%, aerobic hydrolysis temperature is 44℃; aerobic hydrolysis time is 8h. The results show that corn straw in aerobic hydrolysis treatment degradation of most part lignin is derived from the skin and leaves, and the higher lignin of material itself, the lignin degradation rate.