牛粪对互花米草混合厌氧消化过程的影响研究

以互花米草和牛粪为原料，采用中温（35℃）批式发酵的方式，考察了添加牛粪对互花米草厌氧消化过程的影响.结果表明，互花米草单独发酵时，单位VS产气量为222.61 mL/g，发酵过程出现酸化现象，pH最低为5.60；添加牛粪改善了厌氧微生物的生存环境，提高了系统的缓冲能力，发酵过程未出现酸化现象，pH经短暂下降后很快恢复到7.2～7.5，累积产气量提高了38.83%，互花米草单位VS产气量为309.05 mL/g.混合发酵对消化液中有机酸产量影响不大，但有机酸高峰提前5d出现.FTIR表明，混合发酵促进了微生物对互花米草中易分解有机物的利用.发酵前、后和混合发酵互花米草的结晶度指数cri分别为0.617 6、　0.620 0和0.615 4.

Effect of Cow Feces on Anaerobic Digestion Process of Spartina alterniflora

Effects of cow feces on anaerobic digestion process of Spartina alterniflora was studied by batch model at 35 ℃ .When Spartina alterniflora was digested alone, the biogas yield was 222.61 mL/g,and it was acidified from 10 d to 15 d. When cow feces was added, the environment where microorganisms lived in was meliorated, pH value was stabilized and bingas production was improved by 38.83 % . Volatile fatty acids production was not affected significantly, but the peak was advanced. FTIR and XRD analysis of solid residue substances further proved that co-digestion promoted the removal of carbohydrates and resulted in higher content of lignin than Spartina alterniflora straw digested alone,and promoted the destruction of crystalline of cellulose. The crystallinity index ( C_rI) of Spartina altemiflora, digested Spartina alterniflora and co-digested Spartina alterniflora were 0.6176, 0.6200 and 0.615 4, respectively. Therefore, adding cow feces was beneficial for the decomposition and increasing the biotransformation rate of Spartina alterniflora straw.