电极生物膜法全自养系统处理氨氮废水性能研究

采用自制三维电极生物膜反应器进行脱氮试验,研究了电极生物膜法全自养条件下处理氨氮废水的脱氮性能。在进水不含有机碳源,电流强度为30 mA,电流密度为0.012 mA/cm2的条件下,当进水氨氮负荷为100 mgN/(L·d)时,氨氮转化能力为64mgN/(L·d),总氮去除能力为50 mgN/(L·d),达到该试验最大脱除能力。在运行周期24 h范围内,电极生物膜反应器前2 h受电化学间接氧化作用影响显著,2 h之后因阳极区的产气量大降低溶液中Cl-浓度,使得电化学作用影响减弱,主导作用由电化学转化为受底物抑制的复杂的生物作用。电极生物膜法在电化学和生物硝化-反硝化共同作用下具有良好的脱氮能力。

Property of Autotrophic Denitrification System by Electrode-biofilm

A novel three dimension electrode-biofilm reactor was made for denitrification experiment,and used to study the performance of autotrophic denitrification on treatment of ammonia nitrogen wastewater by electrode-biofilm.The denitrification rate could reach 64 mgN/（L · d） and the total nitrogen removal ability could reach 50 mgN/（L · d） as the largest ability of the experiment,while the water ammonia nitrogen load was 100 mgN/（L · d）,the current was 30 mA,the current density was 0.012 mA/cm2,and no organic carbon sources contains in the feed water.During the operation cycle range,the electrode-biofilm reactor was affected by indirect electrochemical oxidation significantly in the first 2 hours.After 2 h,the impact of the electrochemical oxidation was reduced because of the Cl-concentration reduced by gas production in the anode,the leading role of reactor transform electrochemical into biological function.Under the function of the electrochemical oxidation and the biological nitration-nitrification,the electrode-biofilm has a good ability of denitrification.