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为了评价牛粪和玉米秸秆的产甲烷潜力,研究其厌氧消化过程动力学方程,采用自制序批式厌氧发酵实验装置对某养殖场牛粪和秸秆的最大甲烷生产潜力及其发酵过程进行研究。通过实验研究,测得接种物、牛粪和玉米秸秆的累计甲烷产量分别为64.87、244.0和466.54 m L CH4/g VS。根据实测的产气量变化曲线,按照modified Gompertz equation模型进行方程拟合,牛粪组和玉米秸秆组拟合方程的相关性系数分别为0.983和0.991,表明运用modified Gompertz equation模型预测牛粪和玉米秸秆的产甲烷潜力方法可行。通过对产甲烷过程的动力学研究得到:接种物、牛粪和玉米秸秆的最大产甲烷潜力分别为66.07、213.93和458.57 m L CH4/g VS,与实测值的误差率分别为1.8%、12.3%和1.7%;牛粪和玉米秸秆的最大甲烷日产气率(Rm)和延滞期时间(λ)分别是13.14 m L CH4/(g VS·d)、30.76 m L CH4/(g VS·d)和0.35 d、0.71 d。综上,玉米秸秆厌氧消化的停滞期长,但总产气量和最大甲烷日产期率都比牛粪高。
In order to evaluate the methane production potential of cow dung and corn stover, the kinetic equation of anaerobic digestion process was studied. The maximum methane production potential and the fermentation process of cow dung and straw in a farm were studied by a homemade sequencing batch anaerobic fermentation experiment device the study. Through experimental studies, the cumulative methane production of inoculum, cow dung and corn stover was found to be 64.87, 244.0 and 466.54 m L CH4 / g VS, respectively. According to the measured gas evolution curves, according to the modified Gompertz equation model fitting, the correlation coefficients of fitting equation between cow dung group and corn stover group were 0.983 and 0.991, respectively, which indicated that the modified Gompertz equation model was used to predict cow dung and corn stover Methane potential of the method is feasible. According to the kinetics of methanogenic process, the maximum methane yield potential of inoculum, cow manure and corn stover were 66.07, 213.93 and 458.57 m L CH4 / g VS, respectively. The errors with measured values were 1.8%, 12.3 % And 1.7%, respectively. The maximum daily methane production rate (Rm) and lag time (λ) of cow dung and corn stover were 13.14 m L CH4 / (g VS · d), 30.76 m L CH4 / (g VS · d ) And 0.35 d, 0.71 d. In conclusion, the stalled anaerobic digestion of corn stalks is long, but the total gas production and the maximum methane production rate are higher than cow dung.