生物电Fenton技术将生物电化学系统的阳极微生物产电与阴极电Fenton氧化相耦合，无需外加电源，通过阴极原位产生的Fe2+和H2O2构成Fenton试剂，实现污染物的氧化去除，是经济高效的新型水处理技术。本研究以富营养化水体中普遍存在的微囊藻毒素（MC-LR）为模式化合物，揭示生物电Fenton反应去除有机微污染物的效果和机理。通过MC-LR分子的化学分析和产物毒性的生物分析，考察生物电Fenton体系对MC-LR及其毒性的去除效果、反应速率和影响因素。检测阴极室中总铁离子和H2O2浓度，并结合DMPO自由基捕获剂和电子自旋共振波谱分析，测定反应过程中产生的羟基自由基，揭示阴极Fenton试剂和•OH的生成机制；利用液质联用技术分析•OH对MC-LR的攻击点位和氧化产物，阐明生物电Fenton法对MC-LR的氧化途径，为建立基于生物电化学系统的有机微污染水体强化治理技术提供理论依据。

The bio-electro-Fenton (BEF) technology couples the anodic power generation by microorganisms and the cathodic electro-Fenton oxidation in a bioelectrochemical system. Pollutants are removed via oxidation by the Fenton's reagents, Fe2+ and H2O2, in situ produced on the cathode without any external electricity input, which is shown to be a cost-effective technology for water treatment. In this study, the mechanisms for the removal of organic micro-pollutants via the BEF reaction are studied with microcystin-LR (MC-LR), a ubiquitous micro-pollutant in eutrophic water, as the model compound. Based on the chemical analysis of MC-LR molecules and the biological analysis of the toxicity of the degradation products, the efficiencies, kinetics and influential factors of the MC-LR removal are investigated in the BEF system. The concentrations of total iron ions and H2O2 in the cathode chamber are analyzed, and the hydroxyl radicals are detected with the electron spin resonance spectrometer after the addition of DMPO, a radical trapping agent, to reveal the formation mechanism of the Fenton's reagents and hydroxyl radicals on the cathode; the reaction sites in the MC-LR molecule attacked by the hydroxyl radical and the oxidation products are determined with the liquid-chromatography coupled with mass spectrometry, and the oxidation pathway of MC-LR by hydroxyl radicals is proposed. The study will provide theoretical evidence for the development of enhanced treatment technology for organic micro-polluted surface water based on bioelectrochemical system.