A short-term stimulation of ethanol enhances the effect of magnetite on anaerobic digestion
作者： Caiqin Wang , Weilong Qiao , Hui Chen , Xiangyang Xu , Liang Zhu
DOI: 10.1007/S00253-018-9531-2
关键词:
摘要: Conductive iron oxides (CIO) have been proved recently to facilitate the anaerobic microbial syntrophy based on direct interspecies electron transfer (DIET) in batch experiments. However, effect of CIO was always insignificant digestion (AD) reactor especially when DIET-based syntrophic partners were absent. In this study, magnetite performance AD system with sucrose as a sole carbon source investigated, but limited enhancement achieved during first 36-day operation. The short-term ethanol addition further studied magnetite-amended reactor, and results showed that 10gFe/L micro-sized (R3) higher COD removal methane proportion compared other reactors (R1 without magnetite; R2 2gFe/L R4 nano-sized magnetite). Meanwhile, pyridoxine extracellular polymeric substances (EPS) conductivity sludge from R3 increased more significantly than those others. Analysis high-throughput sequencing indicated abundance archaea Methanosarcina responsible for DIET dominant (63.64%). Additionally, potential electroactive bacteria Chloroflexi 7.57-fold, 3.61-fold 7.37-fold R1, R4, respectively. These demonstrated microbes methanogens could be enriched efficiently via synergetic stimulation.
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