氢基质生物膜反应器同步去除溴酸盐和高氯酸盐的影响因素分析

The Influence Factors of Simultaneous Removal of Bromate and Perchlorate by Hydrogen-based Membrane Biofilm Reactor

基于H2-MBfR(氢基质生物膜反应器)研究pH、进水硝态氮(NO_(3)^(-)-N)、亚硝态氮(NO_(2)^(-)-N)以及回流比对同步去除溴酸盐(BrO_(3)-)和高氯酸盐(ClO_(4)^(-))的影响。结果表明:提高进水pH,BrO_(3)^(-)和ClO_(4)^(-)的去除率呈现先升高后降低的趋势,溴酸盐与高氯酸盐的去除率在pH为7时达到最高值93.9%和91.6%。提高进水NO_(3)^(-)N质量浓度,BrO_(3)^(-)和ClO_(4)^(-)的去除率从95%分别降到18.7%、22.4%;提高亚硝态氮质量浓度,BrO_(3)^(-)和ClO_(4)^(-)去除率呈下降趋势,两者去除率分别从90.3%,91.3%降至41.7%和26.8%。这表示反硝化中间产物NO_(2)^(-)对BrO_(3)^(-),ClO_(4)^(-)的去除有抑制作用;提高回流比,BrO_(3)^(-)和ClO_(4)^(-)的去除率均呈现先升高后降低的趋势,回流比为7.5时,BrO3-和ClO4-的去除率达到最大,分别为79.9%、81.9%。当量电子通量分析表明,在同一反应体系中,对电子供体的竞争优势顺序为NO_(3)^(-)-N>NO_(2)^(-)-N>ClO_(4)^(-)>BrO_(3)^(-)。

The effects of pH,influent nitrate nitrogen(NO_(3)^(-)-N)concentration,nitrite nitrogen(NO_(2)^(-)-N)concentration and reflux ratio on bio-reductive degradation of bromate(BrO_(3)^(-))and perchloric acid(ClO_(4)^(-))by hydrogen-based membrane biofilm reactor were studied.The results showed that,increasing the pH of influent water,the removal rate of BrO3-and ClO4-increased first and then decreased.The removal rates of bromate and perchlorate reached the highest values of 93.9%and 91.6%at pH 7.Increasing the concentration of NO_(3)^(-)N,the removal rates of both BrO_(3)^(-)and ClO_(4)^(-)decreased from 95%to 18.7%and 22.4%,respectively.Increasing the concentration of nitrite nitrogen,the removal rates of BrO_(3)^(-)and ClO_(4)^(-)showed a downward trend,the removal rates were reduced from 90.3% and 91.3%to 41.7%and 26.8%,respectively.This indicated that the denitrification intermediate NO2-inhibited the removal of BrO_(3)^(-)and ClO_(4)^(-).Increasing the reflux ratio,the removal rates of BrO_(3)^(-)and ClO_(4)^(-)increased first and then decreased.When the reflux ratio was 7.5,the removal rates of BrO_(3)^(-)and ClO_(4)^(-)reached the maximum,which were 79.9%and 81.9%,respectively.The equivalent electron flux analysis showed that in the same reaction system,the competitive advantage order for electron donors was NO_(3)^(-)-N>NO_(2)^(-)-N>ClO_(4)^(-)>BrO_(3)^(-).