生物膜电极工艺去除微污染源水中氨氮的研究

Biofilm-electrode Process for Removal of Ammonia Nitrogen from Micro-polluted Source Water

采用生物膜电极工艺去除微污染源水中的氨氮。在好氧区利用金属阳极电解产氧,在硝化细菌的作用下使氨氮转化为硝酸盐氮或亚硝酸盐氮;在缺氧区利用碳棒作为阴极电解产氢,实现反硝化脱氮。试验结果表明:C/N、电流强度、氨氮浓度、进水流量等对去除总氮均有影响;在流量为3L/d、无外界供氧、电流强度为19.5mA、C/N为1的条件下,当进水COD为10mg/L、氨氮为7mg/L时,对总氮的去除率可达95.6%,显著改善了水质。

The biofilm-electrode process was used to remove NH4^＋ -N from micro-polluted source water. The NH4^＋ - N is oxidized to NO3^- - N or NO2- - N with the action of nitrobacteria at aerobic phase in which the oxygen is produced by the metal anode. The denitrification is completed at anaerobic phase with the hydrogen produced by the cathode of carbon rods. The results show that the removal rate of TN is affected by the C/N, current intensity, NH4^＋ - N concentration and flow rate. The removal rate of TN can reach 95.6% with flow rate = 3 L/d, no oxygen addition, current intensity = 19.5 mA, C/N = 1, COD = 10 mg/L, NH4^＋ - N = 7 mg/L. Therefore, the water quality is improved greatly.