电解产氢自养反硝化去除地下水中硝酸盐氮的研究

Autotrophic Denitrification of Groundwater by Electrochemical Process

研究一种用于去除地下水中硝酸盐的电化学反硝化方法及其反应器特性 .以活性炭纤维作电极进行电化学反应 ,通过在阴极产生的氢气作为自养反硝化的电子供体 ,对水中NO3- N有良好的去除效果 ,并无NO3- N积累 .研究结果证明 ,当原水中的NO3- N浓度为 2 8 8mg/L ,反应器的最佳电流强度为 9mA ,最大水力负荷为35ml/h ,反应器对水的pH变化具有较好的缓冲能力。在通电 1h后 ,反应器内的氧化还原电位降至 -2 0 0mV以下 ,因而可以很快在反应器内造成缺氧环境 。

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 NO 3 - 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.