中文摘要：

连续流微生物电解池能有效应用于污水处理中，为了解不同有机负荷率（OLR）对单室微生物电解池（MEC）性能的影响，采用连续流方式，以生活污水为基质，研究恒定外加电压0.6 V、不同OLR（810、920、1 080、1 484、1 680、2 531、2 780 mg L-1 d-1）情形下化学需氧量（COD）去除率、甲烷（CH4）产率及能耗等. 结果表明，随着OLR增加，COD去除率和能量消耗呈降低趋势，而CH4产率呈增加趋势. 实验初期，外加电压为0.6 V，进水COD浓度为200 mg/L，MEC对COD去除率达到70%，而厌氧消化（AD）只能达到41%，此时MEC中CH4含量为8.39%，而AD只有6.44%. 实验过程中，外加电压为0.6 V，OLR为2 780 mg L-1 d-1时，CH4产率达到了（126.72 ± 0.30）mL L-1 d-1，而能量消耗为（0.032 0 ± 0.005 2）kW h/kgCOD. 菌群高通量分析结果显示，MEC阳极碳毡的优势菌群为Methanothrix sp.和Geobacter sp.，其丰度分别为39.05%和21.83%，而AD组相应丰度只占2.00%和11.76%. 综上，MEC可以在低能耗下有效处理低浓度生活污水并同步产CH4，这为生活污水处理提供了新的思路.

英文摘要：

In order to investigate the effects of organic loading rate （OLR） on the performance of microbial electrolysis cells （MEC）, a continuous membraneless single-chambered MEC was adopted to treat domestic wastewater. With the change of organic loading rate （OLR = 810, 920, 1 080, 1 484, 1 680, 2 531, or 2 780 mg L-1 d-1）, the methane production rate, chemical oxygen demand （COD） removal rate, and energy consumption were examined at a constant voltage of 0.6 V. The results showed that methane production rate increased with increasing OLR, while the COD removal rate and energy consumption decreased. At the onset of the experiments, the influent COD concentration was 200 mg L-1 d-1, the applied voltage was 0.6 V, the COD removal rate was 70%, and the methane concentration was 8.39%, compared with anaerobic digestion （AD）, in which the COD removal rate and methane concentration were 41% and 6.44%, respectively. When the OLR was 2 780 mg L-1 d-1, the methane production rate could reach 126.72 ± 0.30 mL L-1 d-1 at a relatively low energy consumption of 0.0320 ± 0.0052 kW h/kg COD. Analysis of high-throughput sequencing indicated that the dominant bacteria in the carbon felt of the anode chamber were Methanothrix sp. and Geobacter sp., which were 39.05% and 21.83%, respectively, of all bacteria present. Under the same conditions, in AD group the corresponding content was 2.00% and 11.76%, respectively. A continuous membraneless single-chambered MEC could be successfully used to treat domestic wastewater and provide enhanced methane production at a relatively low energy consumption.