水稻与棉花秸秆不同预处理厌氧发酵产沼气

Different pretreatments of straws and cotton in anaerobic fermentation to produce biogas

以猪粪为接种物,以棉花秸秆和水稻秸秆为发酵原料,分别对秸秆进行稀碱法预处理和稀碱法与超声波联合预处理,在发酵温度为(37±1)℃的条件下进行厌氧发酵产沼气的研究。结果表明,以联合预处理的秸秆为发酵原料,厌氧发酵的各项指标均比以稀碱预处理秸秆发酵的效果好,其中累积产气量和沼气中甲烷含量分别提高35.23%和2.4%,发酵后TS、VS含量相对减少2.6%～10.94%,发酵液代谢产物中的有机酸丙酮酸、乙酸和柠檬酸含量相对减少23.9%～25.9%、20.24%～24.53%和41.08%～45.91%。

With pig manure as inoculum, cotton stalks and rice straw as raw materials, dilute alkali pre- treatment and dilute alkali combined with ultrasonic pretreatment of straw were carried out at the fermentation temperature of （37±1）℃ to produce biogas. The results showed that the effect of pretreatment of straw as com- bined fermentation was better than the dilute alkali pretreatment of straw in anaerobic fermentation, in which the cumulative gas production and methane content increased 35.23% and 2.4% , respectively, after fermentation the liquid TS, VS content reduced 2.6% - 10.94%, respectively. Metabolites in the fermentation of organic acids, the content of pyruvic-acid, acetic acid and citric acid relatively reduced 23.9% -25.9% , 20.24% - 24.53% and 41.08% -45.91% , respectively.