摘要
厌氧消化常作为高负荷污水和固体废物处理的手段,经济高效,有良好的应用前景.该过程由不同的微生物群体介导,微生物之间形成共生关系,从而克服代谢过程的热力学障碍.在共生关系中,微生物种间电子传递过程极其重要,有机物氧化菌与产甲烷菌一般通过种间氢或甲酸传递进行种间间接电子传递.随着研究进行,人们发现了电子传递效率更高的直接种间电子传递,可实现微生物之间直接电子交换,而不需要如氢气、甲酸等作为电子传递载体.目前研究已表明具有导电性质的材料如某些碳材料以及铁氧化物能够促进直接种间电子传递.为加深对种间电子传递的理解以期提高厌氧消化效率,本文陈述了厌氧消化种间氢传递和直接种间电子传递的机理以及非铁氧化物促进直接种间电子传递的研究现状,着重介绍了铁氧化物促进直接种间电子传递的研究进展,并分别从热力学、动力学、理化性质三个方面进行了分析,最后对铁氧化物促进直接种间电子传递的研究进行了展望.
Anaerobic digestion is often used as an economical and efficient method for high load sewage and solid waste treatment,which has a good application prospect.Anaerobic digestion is mediated by different microbial groups,in which symbiotic relationship is formed between microorganisms so as to overcome the thermodynamic obstacles of metabolic process.It is very important of interspecies electron transfer in the symbiosis.Indirect interspecies electron transfer between organic oxidizing bacteria and methanogens is generally carried out through interspecies hydrogen or formate transfer.With the progress of research,it has been found that direct interspecies electron transfer(DIET)with higher electron transfer efficiency can finish direct electron exchange between microorganisms without hydrogen and formate as electron transfer carriers.At present,studies have shown that materials with conductive properties,such as some carbon materials and iron oxides,can promote DIET.In order to get a further insight into the interspecies electron transfer to improve the efficiency of anaerobic digestion,this review describes the mechanism of interspecies hydrogen transfer and DIET.The research situation of DIET promoted by non-iron oxides has also been summarized.Besides,the research status of iron oxides promoting DIET has been emphasized,of which the promotion mechanisms studies has been analyzed in three aspects:thermodynamics,kinetics,physical and chemical properties.Finally,the research on iron oxides promoting DIET is prospected.
作者
朱剑锋
王艳琼
王红武
ZHU Jianfeng;WANG Yanqiong;WANG Hongwu(School of Environmental Science&Engineering,Tongji University,Shanghai,200092,China;Shanghai Institute of Pollution Control and Ecological Security,Shanghai,200092,China)
出处
《环境化学》
CAS
CSCD
北大核心
2022年第6期1856-1868,共13页
Environmental Chemistry
基金
国家自然科学基金(51778449)资助.
关键词
厌氧消化
直接种间电子传递
种间氢传递
铁氧化物
异化铁还原
anaerobic digestion
direct interspecies electron transfer(DIET)
interspecies hydrogen transfer
iron oxides
dissimilatory iron reduction
