搭建能实现外源H2连续通入沼气厌氧发酵体系的小试装置,达到原位转化CO2合成CH4的目的.利用秸秆进行中温(35℃)和高温(55℃)厌氧发酵,探索外源H2的通入对发酵过程的影响.结果表明:外源H2的通入使得沼气产量和沼气中CH4相对含量明显提高,但沼气产量不与外源H2通入量成正比,外源H2通入量以CO2产生量的5倍为宜,此时外源H2转化率也达到最高,平均约为86%(中温发酵)和91%(高温发酵),消耗的外源H2几乎全部转化为CH4;高温发酵比中温发酵更具优势.%Experimental system was set up for continuous introduction of exogenous H2 into a biogas anaerobic fermentation system to convert CO2 in the biogas into CH4 in situ. Anaerobic fermentation under both mesophilic and thermophilic conditions were carried out using straw, and the effect of exogenous H2 on the fermentation process was explored. The results show that both biogas production and CH4 relative content increase significantly after H2 addition, but biogas production is not proportional to exogenous H2 flow rates. The optimal exogenous H2 flow rate is 5 times of CO2 production, and the average conversion of exogenous H2 is about 86% for mesophilic fermentation and 91% for thermophilic fermentation under such conditions. Almost all exogenous H2 consumed is converted to methane. The results show that thermophilic fermentation is more advantageous than mesophilic fermentation.
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