超微粉碎泥炭发酵产生物甲烷的研究

Fermentation Production of Biomethane by Superfine Grinded Peat

采用超微粉碎对泥炭进行预处理,研究了超微粉碎泥炭的粒度分布,测定了泥炭发酵产生物甲烷过程中的日产气量、总产气量及发酵体系的pH值、还原糖含量和挥发性脂肪酸含量,研究了超微粉碎预处理对泥炭发酵产生物甲烷的影响;并采用透射电镜分析了发酵前后超微粉碎泥炭的形貌,解析了超微粉碎对泥炭发酵产生物甲烷的影响机理。结果表明:超微粉碎泥炭发酵总产气量为805.7 mL,较200目泥炭发酵总产气量(579.7 mL)提高了38.98%;超微粉碎泥炭产生物甲烷的发酵周期为48 d,比200目泥炭的发酵周期延长了13 d,提高了总产气量。超微粉碎能够提高泥炭有机质的生物可降解性,提高泥炭生物甲烷产量,延长泥炭发酵周期。

We pretreated peat by superfine grinding,and studied the particle size distribution of superfine grinded peat.Moreover,we determined daily biomethane production,total biomethane production,pH value,reducing sugar content,and volatile fatty acid content in the fermentation system,and investigated the effect of superfine grinding pretreatment on biomethane production fermented by peat.Furthermore,we characterized the morphology of peat before and after superfine grinding by transmission electron microscopy,and analyzed the influence mechanism of superfine grinding on biomethane fermented by peat.The results show that the total biomethane production of superfine grinded peat is 805.7 mL,which is 38.98%higher than that of the 200 mesh peat(579.7 mL).In addition,the biomethane fermentation period of superfine grinded peat is 48 d,which is 13 days longer than that of the 200 mesh peat,increasing the total biomethane production.The superfine grinding pretreatment can improve biodegradability of peat organic matter,increase the biomethane production of peat,and prolong the fermentation period of peat.