不同TS浓度互花米草沼渣二次发酵特性研究

中温（35±1）℃条件下,沼渣经6%的NaOH常温下处理48 h后,在TS含量8%、10%、12%的条件下沼气发酵.分析了发酵过程中日产气量、累积产气量、甲烷含量、pH值、挥发性脂肪酸（VFA）的变化,从不同角度考察TS含量负荷对沼渣二次发酵特性的影响.单位TS的日产气高峰分别达10、14、13 mL.g-1,累积产气率为217、227、228 mL.g-1,甲烷含量均在65%以上.发酵过程中最低pH为7.04.乙酸浓度最高分别为3 364、3 286、5 728 mg.L-1,丙酸和丁酸浓度均低于1 100 mg.L-1.结果表明,沼渣为难降解有机物,分解缓慢,不易出现酸化现象,但仍具有较强的产气潜力.

Effect of TS Loading Rates of Biogas Residue of Spartina alterniflora for Secondary Anaerobic Digestion

Biogas residue of Spartina alterniflora treated by NaOH solution for 48h at room temperature was used for secondary anaerobic digestion with TS loading rates were 8%, 10%, 12% at (35 +/- 1) degrees C. The biogas yield, pH, and volatile fatty acid (VFA) were analyzed during the anaerobic digestion. The peak of daily gas production were 10, 14, 13 mL x g(-1) and the rates of cumulate gas production were 217, 227, 228 mL x g(-1) respectively. The methane content exceeded 65% and the lowest pH value was 7.04 during the process. The concentrations of acetic acid concentrations were 3 364, 3 286, 5 728 mg x L(-1) respectively while propionic acid and butyric acid concentrations were below 1 100 mg x L(-1). Biogas residue as a non-degradation organic compound with high potential biogas yield was decomposed slowly and no acid accumulation was not observed.