不同预处理方式对柳枝稷厌氧发酵性能的影响

以柳枝稷为原料,研究微波,蒸汽加热和NaOH预处理方法对柳枝稷的结晶度和纤维结构的影响,同时考察了预处理后的柳枝稷在中温时的厌氧发酵性能.结果显示:3种处理都可以降低原料的结晶度；微波和NaOH处理可以显著降低柳枝稷的中性洗涤纤维、酸性洗涤纤维、木质素等含量；NaOH处理会降低粗脂肪的含量；蒸汽加热处理和原料的累积产气量(28 486和28 686 mL)及产气率(453.60和456.79mL/g)接近,而NaOH预处理由于C/N较高、阳离子毒害作用和抑制物的作用使得厌氧发酵性能降低.可见预处理可以降低柳枝稷纤维含量,但是对厌氧发酵性能并无明显改善作用.

Effects of different pretreatments on efficiency of anaerobic digestion of switchgrass

The objective of the research was to investigate effects of pretreatments of microwave, steam heating and adding sodium hydroxide on crystallinity and fiber structure of switchgrass. All treatments could decrease crystallinity of raw materials. Neutral detergent fiber, acid detergent fiber and lignin contents decreased when pretreatment of microwave and adding sodium hydroxide (NaOH) were used. Crude fat content also declined by adding sodium hydroxide. There was no difference on biogas production (28?486 and 28?686 mL) and the biogas production rate (453.60 and 456.79 mL/g) between untreated material and steam heated material. The anaerobic digestion decreased by adding sodium hydroxide because of high ratio of C/N, toxic effects of cationic and inhibitor. The results showed that all treatment could decrease contents of fiber of Panicum virgatum, but could not improve the anaerobic digestion.