紫茎泽兰产氢产甲烷联合发酵的研究

以脱毒预处理的紫茎泽兰为原料,调节发酵体系的pH,可实现紫茎泽兰产氢产甲烷联合发酵.pH为4.7~5.5的情况下先产氢后调至中性产甲烷,对比实验为pH6.5~7.5的情况下先产甲烷后调节至酸产氢.实验结果表明:先产氢后产甲烷实验的TS和VS原料利用率均高于先产甲烷后产氢实验,且纤维素、半纤维素和木质素利用率也高出32.60%,45.80%和50.26%;紫茎泽兰产氢阶段终点可根据实验组、对照组产气趋势是否趋于一致来进行判断;先产氢后产甲烷实验的产甲烷速率比先产甲烷后产氢实验高出18.85%,有效缩短了发酵周期;先产氢后产甲烷实验实现了能源利用效率的68.54%,而先产甲烷后产氢实验只实现了能源利用效率的15.35%.实验得出,与先产甲烷后产氢发酵、单独产甲烷发酵、单独产氢发酵相比,紫茎泽兰联合产氢产甲烷发酵是理想的紫茎泽兰利用途径之一.

The study on co-fermentation of hydrogen and methane produc-tion by Eupatorium adenophorum spreng

The experiment demonstrates the co-fermentation of hydrogen and methane production by pretreated Eupatorium adenophorum Spreng through pH value determination of the fermentative system. The pH range of 4.7?5.5 favor hydrogen production before methane production, while the pH range of 6.5?7.5 favor methane production before hydrogen production. The experiment shows that the TS and VS utilization ratio of first hydrogen production then methane production is higher than that of first methane production then hydrogen production. The use ratio of cellulose, hemicellulose and lingin of hydrogen production followed by methane production is 32.60%, 45.80% and 50.26% higher than that of methane production followed by hydrogen production, respectively. One method of assessing the termination of hydrogen production from fermentation is observing the time when testing group hydrogen production equals control group hydrogen production. The rate of methane generation of hydrogen production followed by methane production is 18.85% higher than that of methane production followed by hydrogen production, which can shorten the overall fermentation time. The energy utilization efficiency of hydrogen production followed by methane production is 68.54%, while the efficiency of methane production followed by hydrogen production is 15.35%. This experiment suggests that hydrogen production followed by methane production of co-fermentation by pretreated Eupatorium adenophorum Spreng is a preferable approach compared with methane production followed by hydrogen production, only methane production, or only hydrogen production.