鸡粪与互花米草沼渣混合发酵产甲烷的研究

在中温(35℃±1℃)条件下,采用批式发酵方式,进行了鸡粪与互花米草沼渣不同混合比例的厌氧发酵实验.实验设置鸡粪∶互花米草沼渣干物质(TS)比分别为5∶0(T1)、4∶1(T2)、3∶2(T3)、2∶3(T4)、1∶4(T5)和0∶5(T6)共6个处理.结果表明,经中温干发酵后的互花米草沼渣仍具有一定的厌氧产沼气能力,TS产气量为107.25 mL.g-1,甲烷含量为76.92%,厌氧微生物对互花米草沼渣纤维素的结晶区有一定的破坏作用,厌氧发酵后纤维素的相对结晶度指数CrI下降了5.55%;将鸡粪与互花米草沼渣混合发酵,明显提高了原料的厌氧产气性能,T2的产气效果最好,T1、T3～T6的累积产气量分别为T2的61.31%、62.09%、52.15%、39.74%和31.67%;鸡粪与互花米草沼渣混合发酵的产酸类型为混合型发酵,发酵过程中未出现酸化现象;混合发酵对破坏互花米草沼渣纤维素的结晶区有利,促进效果在1.13%～21.61%.

Methane Production by Anaerobic Co-digestion of Chicken Manure and Spartina alterniflora Residue After Producing Methane

The characteristics of Spartina alterniflora residue after producing methane (SAR) digested alone and co-digestion of various proportions of chicken manure and SAR were investigated by batch model at 35 degrees C +/- 1 degrees C. The initial total solid (TS) loading of all treatments was 8.0%. The results indicated that there was still some biogas produced by SAR with TS biogas yield of 107.25 mL x g(-1) and average methane content of 76.92%. The cellulose crystallinity of re-digested SAR was destructed by anaerobic microorganisms, and the destruction rate was 5.55%. Co-digestion meliorated the environment where microorganisms lived in and increased the cumulative biogas yield. When the ratio of chicken manure to SAR was 4 : 1, the cumulative biogas yield was highest while the cumulative biogas yield of T1 (the rate of chicken manure to SAR is 5 : 0 based on TS), T3-T6 (the rate of chicken manure to SAR are 3 : 2, 2 : 3, 1 :4 and 0 : 5 based on TS, respectively) were 61.31%, 62.09%, 52.15%, 39.74% and 31.67% of it. The anaerobic fermentation type of co-digestion is mix acid type fermentation. Co-digested with chicken manure promoted the destruction of cellulous crystallinity by 1.13% - 21.61% and especially when the rate of chicken manure to SAR was 4 : 1.