中文摘要：

为明确生物甲烷产出机理，在实验室条件下模拟生物甲烷产出过程，对反应产出气体的成分及体积分数进行检侧，同时对反应液的pH值进行监侧.实验结果表明，反应过程中，甲烷体积分数最高可达64.74%; pH值从初始值7.13开始，先降至6.58，而后逐渐升高至最高值8.5，并稳定至反应结束;甲烷产出率在反应12 d后，持续4 d稳定在19 mL/g，而后在反应进行到21 d的时候，陡然升至40.65 mL/g.根据气体产出率及体积分数可初步判定，生物甲烷产出过程存在两个产气高峰期.其中，第一产气阶段以二氧化碳的产出为主;第二产气阶段，甲烷的体积分数及产率达到最大.

英文摘要：

Based on the laboratory conditions, we make a modeling of a biological methane output process to determine the mechanism of the biological methane output. With testing the component and concentration of output gases, as well as monitoring the pH value of the reaction liquid, we found the result. During the reac- tion, the methane concentrations could go up to 64.74% ; the pH changed from 7.13 to 6.58 at the begin- ning, then gradually rose to 8.5, and has been stable to the end of reaction; twelve days after, CH4 concen- tration has been stable at 19 mL/g, then suddenly rose to 40.65 mL/g at 21 days. According to the gas output and concentration, we can initially determine that there have two gas production peaks through a biological methane output process. CO2 is primarily in the first stage, and the concentration of the methane production rate is the maximum in the second stage.