Role of magnetite in methanogenic degradation of different substances
Role of magnetite in methanogenic degradation of different substances
复制标题
磁铁矿在不同物质产甲烷降解中的作用
DOI：
10.1016/j.biortech.2020.123720
复制
发表时间：
2020
影响因子：
11.4
通讯作者：
Zhu Liang
中科院分区：
文献类型：
--
作者：
Wang Chen;Wang Caiqin;Liu Jieyi;Han Zixian;Xu Qiujin;Xu Xiangyang;Zhu Liang
为了更好地了解磁铁矿在不同基质甲烷化中的作用，分别以乙酸盐（阶段I）、丙酸盐+丁酸盐（阶段II）和蔗糖（阶段III）为基质，构建了两个上流式厌氧污泥床反应器（RM+磁铁矿; RS+二氧化硅）。RM反应器具有较好的COD去除效果和对不同基质影响的适应性。厌氧污泥颗粒化过程中产生的胞外聚合物（EPS）较多，RM中污泥的强度、疏水性和电活性均优于RS。磁铁矿对不同基质的产甲烷降解有不同的促进作用，在不同阶段磁铁矿促进了脱硫弧菌、史密斯菌、未鉴定的梭菌和甲烷菌等不同的互养伙伴。蔗糖产气的强化因子最高（1.23 ± 0.03），关键酶活性分析表明，潜在的磁铁矿诱导的直接种间电子转移（DIET）促进了糖酵解、丙酮酸氧化和CO2依赖产甲烷之间的过程。
For better understanding the role of magnetite in methanation of different substrates, two up-flow anaerobic sludge bed reactors (RM with magnetite; RS with silica) were built using acetate (stage I), propionate + butyrate (stage II), and sucrose (stage III) as the substrates, respectively. RM reactor showed better COD removal efficiency and adaptability to different substrate impacts. More extracellular polymeric substances (EPS) were produced for anaerobic sludge granulation, and the sludge in RM had better intensity, hydrophobicity and electroactivity compared with those in RS. Interestingly, magnetite had different promoting effects on methanogenic degradation of different substrates, and magnetite facilitated different syntrophic partners, likeDesulfovibrio,Smithella, unidentifiedClostridiatesandMethanosaetain different stages. The strengthening factor of biogas production from sucrose was the highest (1.23 ± 0.03), and analysis of key enzyme activities indicated that the potential magnetite-induced direct interspecies electron transfer (DIET) improved the process between the glycolysis, oxidation of pyruvate and CO2-dependent methanogenesis.