餐厨垃圾厌氧消化起泡现象研究
发布时间：2019-04-19 12:56
【摘要】：以餐厨垃圾中温厌氧消化反应器为研究对象,考察泡沫事件对反应器性能如比沼气产率(SBP)、比甲烷产率(SMP)和挥发性固体(VS)去除率等的影响;并通过分析泡沫前、后系统稳定性参数如挥发性脂肪酸(VFAs)浓度、VFA/总碱度(TA)值和氨氮(TAN)浓度等的变化情况,以及泡沫前、后(包括泡沫层与液体层)的细菌群落结构变化,解析泡沫事件产生的可能原因.结果表明,稳定期的SBP、SMP和VS去除率分别为(0.950±0.104)m~3/kg VS、(0.574±0.072)m~3CH_4/kg VS和(87.14±2.76)%,而泡沫事件显著影响了反应器效率(t检验,95%的置信区间),SBP、SMP和VS去除率分别降为(0.717±0.100)m~3/kg VS、(0.432±0.070)m~3CH_4/kg VS和(84.24±4.44)%.泡沫发生前,系统内出现了VFAs快速积累现象,且易被产甲烷菌消耗的乙酸比例下降,而对泡沫趋势具有增强作用的丙酸比例上升.并且泡沫出现后丝状菌Longilinea arvoryzae和Levilinea,以及黏细菌Cytophaga fermentans的条带强度明显增大,而丝状菌的丝状结构以及粘细菌产生的粘性物质对起泡有一定程度的贡献.综上,泡沫的产生可能是由系统内大量VFAs积累以及特定微生物大量繁殖的联合作用引起的.
[Abstract]:The effects of foam events on the specific biogas yield (SBP), methane yield (SMP) and the removal rate of volatile solid (VS) (VS) were investigated in a medium-temperature anaerobic digestion reactor for kitchen waste. The changes of stability parameters such as volatile fatty acid (VFAs) concentration, total basicity (TA) value of VFA/ and ammonia-nitrogen (TAN) concentration before and after foam were analyzed, as well as before foam. After (including foam layer and liquid layer) bacterial community structure change, to analyze the possible causes of foam events. The results showed that the removal rates of SBP,SMP and VS in stable phase were (0.950 卤0.104) m~3/kg VS, (0.574 卤0.072) m~3CH_4/kg VS and (87.14 卤2.76)%, respectively. However, foam events significantly affected the reactor efficiency (t test). The removal rates of SBP,SMP and VS were reduced to (0.717 卤0.100) m~3/kg VS, (0.432 卤0.070) m~3CH_4/kg VS and (84.24 卤4.44)%, respectively. Before the foam occurred, the rapid accumulation of VFAs occurred in the system, and the proportion of acetic acid easily consumed by methanogenic bacteria decreased, while the proportion of propionic acid which enhanced the foam trend increased. Moreover, the band strength of filamentous bacteria Longilinea arvoryzae, Levilinea, and myxobacteria Cytophaga fermentans increased obviously after foam appeared, while the filamentous structure of filamentous bacteria and viscous substances produced by myxobacteria contributed to the foaming to a certain extent. In conclusion, the foam may be caused by the combination of large amount of VFAs accumulation in the system and the mass propagation of specific microorganisms.
【作者单位】： 重庆大学三峡库区生态环境教育部重点实验室;
【基金】：国家“十一五”科技支撑计划资助项目(2010BAC67B01)
【分类号】：X799
[Abstract]:The effects of foam events on the specific biogas yield (SBP), methane yield (SMP) and the removal rate of volatile solid (VS) (VS) were investigated in a medium-temperature anaerobic digestion reactor for kitchen waste. The changes of stability parameters such as volatile fatty acid (VFAs) concentration, total basicity (TA) value of VFA/ and ammonia-nitrogen (TAN) concentration before and after foam were analyzed, as well as before foam. After (including foam layer and liquid layer) bacterial community structure change, to analyze the possible causes of foam events. The results showed that the removal rates of SBP,SMP and VS in stable phase were (0.950 卤0.104) m~3/kg VS, (0.574 卤0.072) m~3CH_4/kg VS and (87.14 卤2.76)%, respectively. However, foam events significantly affected the reactor efficiency (t test). The removal rates of SBP,SMP and VS were reduced to (0.717 卤0.100) m~3/kg VS, (0.432 卤0.070) m~3CH_4/kg VS and (84.24 卤4.44)%, respectively. Before the foam occurred, the rapid accumulation of VFAs occurred in the system, and the proportion of acetic acid easily consumed by methanogenic bacteria decreased, while the proportion of propionic acid which enhanced the foam trend increased. Moreover, the band strength of filamentous bacteria Longilinea arvoryzae, Levilinea, and myxobacteria Cytophaga fermentans increased obviously after foam appeared, while the filamentous structure of filamentous bacteria and viscous substances produced by myxobacteria contributed to the foaming to a certain extent. In conclusion, the foam may be caused by the combination of large amount of VFAs accumulation in the system and the mass propagation of specific microorganisms.
【作者单位】： 重庆大学三峡库区生态环境教育部重点实验室;
【基金】：国家“十一五”科技支撑计划资助项目(2010BAC67B01)
【分类号】：X799
【参考文献】
相关期刊论文 前3条
1 李蕾;何琴;马W，
本文编号：2460963
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