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This study for the first time proposed an efficient microbial electrolyte/UV system for Methyl Orange decomposition.With an extal applied voltage of 0.2 V and cathode aeration of 20 mL/min,H2O2 could be in-situ generated from two-electron reduction of oxygen in cathode,reaching to 8.1 mg/L in 2 hr and continued to increase.The pollutant removal efficiency of approximate 94.7％ was achieved at initial neutral pH,with the activation of·OH in the presence of UV illumination.Although the nature of its guiding prinicples remain on the vista of practical exploration,this proof-of-concept study provides an altemative operation patt of solar-microbial hybrid technology for future wastewater treatment from a basic but multidisciplinary view.