Magnetite-enhanced bioelectrochemical stimulation for biodegradation and biomethane production of waste activated sludge
Magnetite-enhanced bioelectrochemical stimulation for biodegradation and biomethane production of waste activated sludge
复制标题
磁铁矿增强生物电化学刺激用于废弃活性污泥的生物降解和生物甲烷生产
DOI：
10.1016/j.scitotenv.2021.147859
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发表时间：
2021
影响因子：
9.8
通讯作者：
Zhen G.
中科院分区：
文献类型：
--
作者：
Qin X.;Lu X.;Cai T.;Niu C.;Han Y.;Zhang Z.;Zhu X.;Zhen G.
微生物电解槽（MEC）和磁铁矿（M）在促进生物废弃物厌氧消化（AD）方面表现出优异的性能。本研究采用单一AD、M-AD、MEC-AD和M-MEC-AD四种厌氧系统，全面考察了磁铁矿强化生物电化学刺激对废弃活性污泥（WAS）生物降解和甲烷（CH 4）产生的潜在影响。结果表明，M-MEC-AD系统的甲烷累积产率最高，比MEC-AD系统高9.4%。生物电化学刺激富集了电活性锗和经典产甲烷菌（MethanosaetaandMethanobacterium），与磁铁矿偶联后进一步促进了其增殖。M-MEC-AD系统中的Gesterol（6.9%）、Methanosaeta（0.3%）和Methanobacterium（12.6%）的相对丰度分别是MEC-AD系统的10.8、1.2和1.2倍。磁铁矿的整合可以作为导电材料，并促进固有的间接电子转移（IET）和新兴的直接电子转移（DET）之间的产甲烷菌和发酵细菌，建立一个更节能的种间电子转移和甲烷生产力的途径。研究表明，耦合生物电化学调控和磁铁矿对有机物的生物降解、过程稳定性和CH 4产率有积极的促进作用，为污泥处理和生物能源回收的集成技术提供参考。
Microbial electrolytic cell (MEC) and magnetite (M) have shown excellent performance in promoting anaerobic digestion (AD) of biowastes. In this study, four types of anaerobic systems (i.e. single AD, M-AD, MEC-AD, and M-MEC-AD) were developed to comprehensively investigate the potential effects of magnetite-enhanced bioelectrochemical stimulation on the biodegradation of waste activated sludge (WAS) and methane (CH4) production. Results showed that M-MEC-AD system produced the highest cumulative CH4yield, 9.4% higher than that observed in MEC-AD system. Bioelectrochemical stimulation enriched electroactiveGeobacter, and classical methanogens (MethanosaetaandMethanobacterium), and the proliferation was further promoted when coupling with magnetite. The relative abundance ofGeobacter(6.9%),Methanosaeta(0.3%), andMethanobacterium(12.6%) in M-MEC-AD system was about 10.8, 1.2, and 1.2 times of MEC-AD system, respectively. The integration of magnetite could serve as the conductive materials, and promote inherent indirect electron transfer (IET) and emerging direct electron transfer (DET) between methanogens and fermentative bacteria, building a more energy-efficient route for interspecies electron transfer and methane productivity. This study demonstrated the positive promotion of the coupled bioelectrochemical regulation and magnetite on organic biodegradation, process stability and CH4productivity, providing some references for the integrated technology in sludge treatment and bioenergy recovery.