▎ 摘　　要

NOVELTY - Enhancing denitrification of sewage with low carbon to nitrogen ratio by using electrode biocarriers comprises (a) domesticating electrode biocarriers, spatial configuring and pretreating electrode, using carbon-based or metal materials as working electrod, (b) enriching electroactive denitrification biofilm with activated sludge as inoculum, using three-electrode electrochemical reaction device, taking electrode carrier constructed as working electrode, using carbon-based materials or metal materials as counter electrode, separating working electrode and the counter electrode by ion exchange membrane, where the ion exchange membrane is a cation exchange membrane or proton exchange membrane, placing silver and silver chloride reference electrode in reaction device, allowing working electrode chamber to control anaerobic condition, controlling sewage carbon-nitrogen ratio in working electrode chamber to less than or equal to 5, controlling working electrode potential within the range of -0.2 to -0.7V. USE - The method is useful for enhancing denitrification of sewage with low carbon to nitrogen ratio by using electrode biocarriers. ADVANTAGE - The method solves problem of deep denitrification of urban sewage with a low carbon/nitrogen ratio. DETAILED DESCRIPTION - Enhancing denitrification of sewage with low carbon to nitrogen ratio by using electrode biocarriers comprises (a) domesticating electrode biocarriers, spatial configuring and pretreating electrode, using carbon-based or metal materials as the working electrod, where the electrode configuration can be a two-dimensional planar structure or three-dimensional structure, which can be a graphite rod structure, carbon fiber brush structure and carbon-based or metal sheet-layer superimposed structure, soaking electrode in acetone for 24 hours to remove organic impurities on surface, cleaning and drying, (b) enriching electroactive denitrification biofilm with activated sludge as inoculum, using three-electrode electrochemical reaction device, taking electrode carrier constructed in the step (a) as working electrode, using carbon-based materials or metal materials as counter electrode, separating working electrode and the counter electrode by ion exchange membrane, where the ion exchange membrane is a cation exchange membrane or proton exchange membrane, placing silver and silver chloride reference electrode in reaction device, allowing working electrode chamber to control anaerobic condition, using DC power supply to apply voltage or potentiostat control form to introduce micro electric field if does not control the electrode chamber environment, controlling potential of the working electrode within the range of -0.2 to -0.7 V, adding pure carbon source water distribution during start-up phase, running reactor in a sequential batch mode until the current changes periodically and steadily for more than 4 cycles, adding low carbon to nitrogen ratio sewage into the system until stable operation, where pure carbon source in the start-up phase is volatile organic acids e.g. formic acid and acetic acid, controlling matrix carbon to nitrogen ratio to less than or equal to 5, where operating mode of the working electrode chamber can be either sequential batch or continuous flow mode and controlling sewage carbon-nitrogen ratio (C/N) in working electrode chamber to less than or equal to 5 and controlling working electrode potential within the range of -0.2 to -0.7V.