共存硝酸盐体系下氢基质生物膜反应器对高氯酸盐的去除

Removal of Perchlorate in Hydrogen Matrix Biofilm Reactor with Co-Existing Nitrate System

基于氢基质生物膜反应器(H_(2)-MBfR)运行的短期实验,考察了共存NO_(3)^(-)-N和NO_(2)^(-)-N条件下H_(2)-MBfR对水中ClO_(4)^(-)的还原,并建立了电子分配关系。结果表明:随着NO_(3)^(-)-N和NO_(2)^(-)-N浓度在0.5~50 mg/L变化下,ClO_(4)^(-)的去除通量分别从0.020 g·(m^(2)·d)^(-1)、0.021 g·(m^(2)·d)^(-1)下降到0.009 g·(m^(2)·d)^(-1)和0.012 g·(m^(2)·d)^(-1),说明共存硝酸盐体系下会抑制ClO_(4)^(-)的还原;同时结合电子通量分析表明,NO_(3)^(-)-N的电子通量分配随着浓度的升高,从52.9%上升到99.62%,均高于NO_(2)^(-)-N电子分配比例,说明共存硝酸盐体系中NO_(3)^(-)-N比NO_(2)^(-)-N对ClO_(4)^(-)还原的抑制作用更强。

Based on the short-term experiment of hydrogen-based biofilm reactor(H_(2)-MBfR),H_(2)-MBfR to coexist NO_(3)^(-)-N and NO_(2)^(-)-N was investigated,and the reduction of ClO_(4)^(-)in water was found,and electronic distribution relationship was established.The results showed that with NO_(3)^(-)-N and NO_(2)^(-)-N concentrations under 0.5~50 mg/L,the removal of ClO_(4)^(-)from 0.020 g·(m^(2)·d)^(-1),0.021 g·(m^(2)·d)^(-1) falls to 0.009 g·(m^(2)·d)^(-1) and 0.012 g·(m^(2)·d)^(-1),indicating that ClO_(4)^(-)reduction is inhibited under the co-storage nitrate system;when the electron flux analysis shows that NO_(3)^(-)-N increase from 52.9%to 99.62%,all over the NO_(2)^(-)-N electronic distribution ratio,and mean that NO_(3)^(-)-N rats in ClO_(4)^(-)reduction is more stronger in inhibitory effects of NO_(3)^(-)-N to NO_(2)^(-)-N in the co-producing nitrate system.