Study On Aerogenesis Performance Of Anaerobic Co-digestion Of Cattle Manure And Corn Stover

In this study, biochemical methane potential?BMP? of cattle manure and corn stover are determined by BMP test and predicted by kinetic model. Then select different parameter conditions, such as materials mixing ratio, inoculum and substrate mixing ratio, the organic load rate, and analyze impacts of these factors on the process of anaerobic co-digestion, and optimize process parameters of anaerobic co-digestion. This article contains four experiments, study on BMP of anaerobic digestion of cattle manure campared with corn stover, anaerobic co-digestion of cattle manure and corn stover with different mixing ratios, anaerobic co-digestion of cattle manure and corn stover with different inoculum and substrate ratios, anaerobic co-digestion of cattle manure and corn stover with different organic load rates, respectively.The main results were as followed:?1? Cumulative methane yield of cattle manure and corn stover measured in the experiment were 244.0, 466.54 m LCH₄/g VS, and predicted by Modified Gompertz Equation were 213.93, 458.57 m LCH₄/g VS; BMP of corn stover was higher than that of cattle manure. Anaerobic digestion of cattle manure and corn stover could start in a relatively short time, the lag period were 0.35 d and 0.71 d; The SCOD removal of cattle manure and corn stover were 62.88% and 70.23 %; VS removal of these were 19.68% and 21.64%.?2? Cattle manure and corn stover mixing ratio had a significant effect on methane yield of anaerobic digestion. Gas performance was the best and methane yield was the highest, when cattle manure and corn stover mixing ratio was 3:7. The methane yield of expiremental group contained higher cattle manure was lower than that of higher corn stover, BMP of cattle manure and corn stover mixing materials was higher than that of cattle manure.?3? Inoculum to substrate ratio affected significantly anaerobic digestion. When the inoculum and substrate mixing ratio of 2.0, methane yield was the highest. Inoculum and substrate mixing ratio was too low, the reaction system would produce a number of organic matter, so that methane yield was lower. Inoculum and substrate mixing ratio was too high, organic matter content in reaction system was too low, so that the conversion rate of methane yield was low.?4? Organic load rate had an effect on anaerobic co-digestion of cattle manure and corn stover. Under low organic load rate?1.0?2.0?3.0 kg VS/?m³·d?? conditions, organic load rate was higher, methane yield was higher. When the organic load rate increased to 4.0 kg VS/?m³·d?, digestion system gradually emerged acidification phenomenon, the stability of the digestion system was destroyed. When the organic load rate was 3.0 kg VS/?m³·d?, the operating effect of digestion system was best.