Responsiveness extracellular electron transfer (EET) enhancement of anaerobic digestion system during start-up and starvation recovery stages via magnetite addition
Responsiveness extracellular electron transfer (EET) enhancement of anaerobic digestion system during start-up and starvation recovery stages via magnetite addition
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通过添加磁铁矿，在启动和饥饿恢复阶段增强厌氧消化系统的响应性细胞外电子转移 (EET)
DOI：
10.1016/j.biortech.2018.10.013
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发表时间：
2019-01-01
影响因子：
11.4
通讯作者：
Zhu, Liang
中科院分区：
文献类型：
--
作者：
Wang, Caiqin;Liu, Yang;Zhu, Liang
建立了两个上流式厌氧污泥毯反应器（UASB），分别为添加10 g Fe -1磁铁矿的RM反应器和不添加磁铁矿的RB反应器，研究了在启动和饥饿恢复阶段添加磁铁矿对厌氧消化（AD）性能的影响。添加磁铁矿后，两阶段的COD去除效率和沼气产量均有所提高，RM的回收时间缩短了50%左右。降低了核黄素和血红素c的合成，同时提高了RM的污泥电导率，这表明磁铁矿可以取代它们有效的细胞外电子转移（EET）作用，有利于厌氧菌的生长。微生物群落分析表明，在恢复阶段，RM富集了合养科和甲烷思门等潜在的共生伙伴，提高了生产性能，反应速度快。结果表明，磁铁矿等导电材料的加入可有效提高AD工艺的稳定性和可恢复性。
Two up-flow anaerobic sludge blanket (UASB) reactors (RM with 10 g Fe L-1 magnetite, RB without magnetite) feeding with synthetic wastewater were built to investigate the effect of magnetite addition on anaerobic digestion (AD) performance during start-up and starvation recovery stages. With the magnetite addition, the COD removal efficiency and biogas production during the two stages were enhanced, and the recovery time of RM was shortened by about 50%. The reduced synthesis of riboflavin and heme c along with enhanced sludge conductivity of RM indicated that magnetite could replace their roles for efficient extracellular electron transfer (EET), which favors the growth of anaerobes. Microbial community analysis showed that potential syntrophic partners like Syntrophaceae and Methanothrix were enriched in RM during the recovery stage, and the performance was improved with quick responsiveness. Results demonstrated that addition of conductive materials like magnetite could improve the stability and restorability of AD process efficiently.