餐厨垃圾与混合污泥F/M对发酵制氢的影响

摘要：

Batch experiments were conducted to investigate the effect of food to microorganism ratio(F/M ratio)，between 0:1(blanks)and 10:1，on the fermentation of food waste using thermophilic and mesophilic mixed sludge without any pretreatment. Digesters were inoculated with 100 ml thermophilic sludge or 220 ml mesophilic sludge，both containing 1.54 g volatile solid(VS). The blanks indicated that both seed sludge had a strong ability of producing CH4 but methanogens were almost completely inhibited at F/M ≥ 5. The F/M ratios between 7 and 10 are suitable to the thermophilic H2-producing bacteria. The best 44-h thermophilic fermentation performance was obtained at F/M 7，with a H2 yield of 56.5 ml/g food-VS fed，a H2 content of 37.9％ and a VS degradation of 39.2％. The pH range at F/M 7-10，between initial 6.55?6.27 and final 6.2?5.91，was suitable to the growth of the thermophilic H2-prodcuing bacteria. The mesophilic fermentation was only able to work well at F/M ratios of low level and narrow range(between 5 and 6)，with the highest performance of 38.8 ml/g food-VS H2 yield，34.5％ H2 content and 41.6％ VS degradation at F/M 6. The pH range at F/M 6(between initial 6.3 and final 5.7)was suitable to the growth of the mesophilic H2-prodcuing bacteria. A modified Gompertz equation adequately(R2 > 0.946)described fermentative H2 production at all F/M ratios. Our research provides an approach of H2 production using raw mixed cultures free of chemicals for pretreatment and/or process pH control.

关键词： 餐厨垃圾 混合污泥 发酵制氢

作者: 泮进明 Ruihong Zhang Hamed M. El-Mashad Huawei Sun 应义斌

作者单位: 浙江大学,杭州,310029;University of California,Davis,Davis,95616,CA,USA University of California,Davis,Davis,95616,CA,USA 浙江大学,杭州,310029

会议类型: 国内会议

会议名称: 中国农业工程学会2007年学术年会

会议地点: 大庆

会议语种:中文

在线出版日期: 2007-08-14（万方平台首次上网日期，不代表论文的发表时间）