基于污泥的生物炭辅助嗜热厌氧消化微生物电解池中的废活性污泥产甲烷。
Sludge-based biochar-assisted thermophilic anaerobic digestion of waste-activated sludge in microbial electrolysis cell for methane production.
机构信息
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
出版信息
Bioresour Technol. 2019 Jul;284:315-324. doi: 10.1016/j.biortech.2019.03.146. Epub 2019 Mar 30.
The development of microbial electrolysis cells (MECs) for methane production from waste activated sludge (WAS) is arrested due to the limited methane yield and fragile system stability. This study proposed a strategy to accelerate and stabilize MEC via 1.0 g/g DM (dry matter) sludge-based biochar (BC). The results showed that BC clearly accelerated methane production by 24.7% and enhanced VS removal efficiency by 17.9%, compared to control group. Variations of SCOD, proteins, carbohydrates and VFAs indicated biochar promoted hydrolysis and acidogenesis process. Cyclic voltammetry (CV) curves and coulombic efficiency (CE) suggested organic matters degradation and electron generation on anode were enhanced with supplement of biochar. Microbial community analyses revealed that biochar addition could both promote DIET through substituting exoelectrogen (e.g., Thermincola) on anode and enrich hydrogenotrophic methanogens (e.g., Methanothermobacter) on cathode, which is beneficial to development of MEC as to methane recovery from organic matters.
微生物电解池（MEC）用于从废活性污泥（WAS）中生产甲烷的发展受到限制，因为甲烷产量有限且系统稳定性脆弱。本研究提出了一种通过 1.0 g/g DM（干物质）污泥基生物炭（BC）来加速和稳定 MEC 的策略。结果表明，与对照组相比，BC 明显将甲烷产量加速了 24.7%，并将 VS 去除效率提高了 17.9%。SCOD、蛋白质、碳水化合物和 VFAs 的变化表明生物炭促进了水解和产酸过程。循环伏安法（CV）曲线和库仑效率（CE）表明，补充生物炭后，有机物降解和阳极电子生成得到增强。微生物群落分析表明，生物炭的添加可以通过在阳极上取代（例如，Thermincola）和在阴极上富集氢营养型产甲烷菌（例如，Methanothermobacter）来促进直接电子传递（DIET），这有利于从有机物中回收甲烷的 MEC 的发展。
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