Chen Guang-Yin, Zheng Zheng, Chang Zhi-Zhou, Ye Xiao-Mei
Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China.
Huan Jing Ke Xue. 2011 Aug;32(8):2485-91.
In order to improve the biotransformation rate of Sparnina alterniflora, effect of NaOH-treatment on anaerobic dry-mesophilic digestion of Spartina alterniflora and feasibility of NaOH-treatment as a pretreatment of biogas residues of Spartina alterniflora for advanced anaerobic biogasification were conducted under lab-scale conditions. The results indicated that there was less improvement to biogas yield with NaOH-treatment and the cumulative biogas yield of Spartina alterniflora was 358.94 mL/g TS which was 92.42% to that of control (CK). However, the average methane content was improved slightly with 1.84% improvement. After solid-state pretreatment with 5% NaOH solution for 48 h, the biogas residue of Spartina alterniflora was used for advanced biogasification. This experiment was conducted under 35 degrees C +/- 1 degrees C with initial total solid loading of 8%. The cumulative biogas yield was 209.73 mL/g TS with 70.78% of average methane content, but the biotransformation rate was only 23.29% which was much lower than that of Spartina alterniflora. The fermentation type was propionic acid type fermentation. After two-phase fermentation treatment, cellulose content was decreased significantly while lignin and hemicellulose content were increased. The crystalinity of cellulose of biogas residue decreased after two-phase anaerobic fermentation which was consistent to result of FTIR. The comprehensive analysis of experiment indicated that biogas residue of Spartina alterniflora was still a good material for biogas production and NaOH-treatment was a good pretreatment for biogas production.
为提高互花米草的生物转化率，在实验室规模条件下，研究了NaOH处理对互花米草厌氧干中温消化的影响以及NaOH处理作为互花米草沼渣预处理用于深度厌氧生物气化的可行性。结果表明，NaOH处理对沼气产量的提高作用较小，互花米草的累计沼气产量为358.94 mL/g TS，为对照（CK）的92.42%。然而，平均甲烷含量略有提高，提高了1.84%。用5%NaOH溶液对互花米草进行48 h固态预处理后，将其沼渣用于深度生物气化。该实验在35℃±1℃、初始总固体负荷为8%的条件下进行。累计沼气产量为209.73 mL/g TS，平均甲烷含量为70.78%，但生物转化率仅为23.29%，远低于互花米草。发酵类型为丙酸型发酵。经过两相发酵处理后，纤维素含量显著降低，而木质素和半纤维素含量增加。两相厌氧发酵后沼渣纤维素的结晶度降低，这与傅里叶变换红外光谱（FTIR）的结果一致。实验综合分析表明，互花米草沼渣仍是良好的沼气生产原料，NaOH处理是良好的沼气生产预处理方法。
