玉米秸秆化学预处理后进行厌氧干发酵试验的研究

采用稀硫酸和稀氢氧化钠处理玉米秸秆,分析秸秆纤维组成和纤维结构的变化,并对酸、碱处理后的玉米秸秆进行厌氧干发酵试验。研究表明,采用稀酸处理玉米秸秆的还原糖产率明显高于采用稀碱处理的玉米秸秆;稀硫酸对半纤维素的去除率可达74.27%,稀碱对木质素的去除率最高可达83.94%;玉米秸秆经稀酸处理和稀碱处理后进行厌氧干发酵试验,其累积产气率和甲烷含量都有所提高,但酸法高于碱法。

Using dilute sulfuric acid and dilute sodium hydroxide to treat corn stalk, the composition and structural changes of fiber were analyzed, and then dry anaerobic fermentation with the treated corn stalk by acid and alkali was conducted. The study showed that reducing sugar yield ofpre-treatment corn stalk by acid treatment was higher than that of using dilute alkali pre-treatment on corn stalk significantly. The removal rate of hemicellulose by dilute sulfuric acid treatment was higher, up to 74.27%, higher removal rate of lignin by dilute alkali treatment was up to 83.94%. Dry anaerobic fermentation test was conducted with acid or alkali pre-treated corn stalk, the cumulative gas production rate and methane content were both increased, but that of acid treatment was higher than alkali treatment.