氨化预处理对水稻秸秆厌氧消化产气特性的影响

Effects of Ammoniation Pretreatment on Anaerobic Digestion Performance of Rice Straw

为了探索水稻秸秆厌氧消化产沼气的特性,本文通过使用不同质量浓度的尿素对水稻秸秆进行氨化预处理并测其产气量,来探究和发现氨化预处理对水稻秸秆厌氧发酵产气特性的影响规律。采用不同质量浓度的尿素对水稻秸秆进行氨化预处理,并进一步进行了厌氧消化试验。实验条件为:中温即(35±1)℃温度、水稻秸秆和牛粪的配比条件为1∶1。结果表明,不同百分比的尿素预处理不同程度地对水稻秸秆的组分造成了破坏,使秸秆厌氧消化产沼气潜力得到提高,并且相对缩短了厌氧消化时间。比较总固体与挥发性固体的转化率、甲烷含量、产气量等各项因素,可看出以6%尿素预处理试验组的效果最好;与其他实验组相比,TS和VS的转化率分别提高了54.9%和36.1%,累积产气量最高。综上所述,6%尿素预处理是较优的工艺条件。

In order to explore the characteristics of rice straw anaerobic digestion biogas production, different concentrations of urea were used for ammoniated rice straw pretreatment and its gas production to reveal ammoniated rice straw pretreatment on anaerobic fermentation gas properties studies was measured. Urea ammoniated rice straw pretreated experimental conditions were as follows ： temperature was （35 ＋ 1 ） ~C, the ratio of rice straw and cow dung condition was 1 ： 1, anaerobic digestion tests were carried out. The results showed that the percentage of urea pretreatment on rice straw caused damage to components in varying degrees, straw anaerobic digestion biogas production potential was improved, and anaerobic digestion relative time was shorten. The conversion rate between the factors of total solids and volatile solids content of methane gas production can be seen that the effect of 6% urea pretreatment group was best. Compared with other groups, TS and VS conversion rates were increased by 54. 9% and 36. 1%, the cumulative gas production was highest. The result showed that 6% of urea was preferred pretreatment process conditions.