Autotrophic Denitrification of Groundwater by Electrochemical Process
电解产氢自养反硝化去除地下水中硝酸盐氮的研究

An autotrophic denitrification process and its reactor for removing nitrate from groundwater was investigated in this paper.Using activated carbon fiber(ACF)as electrodes,the electrochemical reactions could produce hydrogen as the donor for autotrophic denitrification.In the process,nitrate was removed effectively and no accumulation of nitrite in the effluent.The results in this study proved that some key factors,such as the applied current density,flow rate of water,oxidation-reduction potential and the nitrate concentration in raw water,influenced the electrochemically denitrifying effect.When the concentration of NO3--N was 28.8mg/L in inlet water,the optimum applied density was 9mA,the highest hydraulic load of the reactor was 35 ml/h,and the reactor performed a practical buffering capacity to pH.After applying electricity to the reactor for 1h,the oxidation-reduction potential decreased to below -200mA,so an adaptable reductive environment could be provided in the reactor for denitrification.