【摘要】 研究了生物电化学系统（BES）强化厌氧消化的机理以及不同底物对强化效果的影响。实验结果表明，BES生产的沼气中甲烷浓度可以稳定提高，同时可以避免产酸阶段挥发性脂肪酸积累造成的不稳定。当底物分别为葡萄糖和乙酸钠时，BES反应器中的甲烷浓度和甲烷产率均高于传统厌氧消化反应器。当底物为葡萄糖时，单批次投料的平均甲烷浓度为71.7%。当底物为乙酸钠时，单批次投料的平均甲烷浓度最高可以达到85.4%,单日池容甲烷产率最高为1.24 m³·m^-3d^-1。通过对BES反应器中的微生物进行高通量测序分析，发现可以通过还原CO₂来生成甲烷的古菌微生物群落的占比高达82.2%,体现出BES中还原CO₂的产甲烷菌占主导。实验结果表明，BES对丙酸盐有明确的降解效果，在15天内反应器中的丙酸盐浓度由1100 mg·L^-1下降至10 mg·L^-1,能避免底物的过度酸化。更多还原

【Abstract】 In this paper, the mechanism of bioelectrochemical system（BES） enhanced anaerobic digestion and the effect of different substrates on the enhancement was studied.The experimental results showed that the concentration of methane in the biogas produced by BES could be increased stably, while the instability caused by the accumulation of volatile fatty acids in the acid production stage could be avoided.When the substrates were glucose and sodium acetate respectively, the methane concentrations and methane yields from BES reactor were both higher than those in the traditional anaerobic digestion reactor.When the substrate is glucose, the average methane concentration of a single batch is 71.7%.When the substrate is sodium acetate, the maximum average methane concentration in a single batch of feed can reach 85.4%, and the maximum methane yield in a single day tank is 1.24 m³·m^-3d^-1.Through high-throughput sequencing analysis of microorganisms in the BES reactor, it was found that the proportion of archaea microbial community that can generate methane by reducing CO₂ was 82.2%, which reflected that the methanogens that can reduce CO₂ were dominant in the BES.The experimental results showed that BES had a clear degradation effect on propionate, and the propionate concentration in the reactor decreased from 1100 mg·L^-1 to 10 mg·L^-1 within 15 days, which could avoid excessive acidification of the substrate.更多还原