不同混合比牛粪玉米秸中温干发酵产沼性能

设置5组牛粪和玉米秸的混合物（干物质比为0∶1、1∶0、1∶1、1∶2、2∶1），研究其在中温35℃下干发酵产沼性能，以产沼性能最好实验组的实验数据为基础，对比研究了两类产气模型。研究结果显示：玉米秸与牛粪的混合干发酵运行效果较好；其中，牛粪和玉米秸干物质比为2∶1时产沼效果最好，产气量最高为81 209 mL，干物质产气率为0.312 m3/kg，整个发酵过程中产气量和甲烷的含量比较稳定，CH4含量最高达56.59%，总固体、挥发性固体的去除率相对较高，分别为26.11%和34.27%。一级动力学模型与多项式函数方程2个产气模型拟合检验结果显示，应用简单的多项式函数即可对产气情况进行相对准确的预测。

Mesophilic dry anaerobic digestion biogas performance of different mix ratios of cow manure and corn straw

Five group mixtures of cow manure and corn straw were prepared with the mass ratios of 0∶ 1,1∶ 0,1∶ 1,1∶ 2 and 2∶ 1,and the dry anaerobic digestion biogas performance were investigated at the mesophilic of 35℃.In addition,two biogas models were comparatively studied based on the date obtained from the optimal performance group.The results showed that dry anaerobic digestion of mixing substrates ran very well.Among the five groups,the group that cow manure and corn straw with 2∶ 1 of mix ratio achieved the best biogas performance,which the most biogas yield was 81 209 mL.The biogas quality of per dry matter was 0.312 m3/kg.The biogas yield and methane content were relatively stable during the whole fermentation process.The methane content was up to 56.59%.The removal rates of total solid and volatile solid were 26.11% and 34.27%,respectively,which were higher than that of other groups.According to the fit testing results of the first order kinetics biogas model and polynomial function biogas model,it can be concluded that the simple polynomial function can be used to forecast biogas yield accurately.