酸解微波预处理对秸秆厌氧消化的促进作用

以秸秆为研究对象，比较微波酸化预处理作用下对秸秆厌氧消化产气特性的影响，实验中研究甲烷产生速率、pH值、甲烷气体体积分数及生物降解率4个参数的变化趋势，结果表明:①微波酸化预处理对秸秆厌氧消化有明显效果，累计产甲烷气量由未被预处理的186.1mL·g-1上升到 245.4～303.4 mL·g-1(以有机物质计)，达到最大甲烷产生速率时间由原来的第12d，提前至4～11d不等，最大甲烷产生速率由原来的1411mL·g-1·d-1上升到 18.64～33.19 mL·g-1·d-1；②经过微波酸化预处理的甲烷体积分数由原来的52.1%提高至64.5%左右，其生物能范围也由未处理前的19.71 MJ·m-3提高至24.41 MJ·m-3，物料降解率由未预处理的44.1%，提高至64.25%.

Anaerobic digestion of straw after microwave pretreatment with acid

High-energy biogas was generated through anaerobic digestion of straw pretreated with acid and microwave energy. In laboratory experiments, the pH, gas production rate and concentration of methane in the gas were monitored. The main conclusions are: ① There was an obvious effect of microwave acidification pretreatment on the efficiency of anaerobic digestion of the straw. The average accumulated gas production from non-pretreated and pretreated straw amounted to 186. 1 and 245. 4 ～ 303. 4 mL · g~(-1), respectively, a significant increase after pretreatment. The maximum daily gas production was also increased to 14. 11 and 18.64 to 33. 19 mL·g~(-1)·d~(-1) , respectively, and was reached after a distinctly shorter period of time ( 12 d for non-treated straw, but 4 to 11 d for the pretreated straw) . ② The CH_4 concentration in the biogas increased from 52. 1 % to 64. 5% , which is equivalent to an increase in bio - energy yield from 19. 71 to 24. 41 MJ·m~(-3). Furthermore, the extent of mineralization was increased from 44. 1% to 64. 25% .