氢基质生物膜反应器去除对氯硝基苯的影响因素分析  

The Impact Factors of Removal of Para-Chloronitrobenzene Using a Hydrogen-Based Membrane Biofilm Reactor

作　　者：李海翔[1,2] 林华[1] 游少鸿[1] 徐晓茵[2] 夏四清[2] 

机构地区：[1]桂林理工大学环境科学与工程学院,广西环境污染控制理论与技术重点实验室,广西桂林541004 [2]同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境科学研究》2015年第2期304-309,共6页Research of Environmental Sciences

基　　金：国家自然科学基金项目(51378368);广西自然科学基金项目(2013GXNSFBA019208);广西危险废物处置产业化人才小高地项目

摘　　要：基于MBfR(氢基质生物膜反应器)研究进水中ρ(p-CNB)(p-CNB为对氯硝基苯)和氢气压力对氢基质自养微生物还原降解p-CNB的影响,同时分析在ρ(p-CNB)和氢气压力影响下生物膜内电子受体生物还原的当量电子通量和还原动力学.结果表明:提高进水中的ρ(p-CNB),p-CNB、p-CAN(对氯苯胺)的去除通量分别由0.014、0.011 g/(m2·d)升至0.099、0.060 g/(m2·d),但p-CNB的去除率由95.9%降至68.4%;提高氢气压力,p-CNB、p-CAN的去除通量分别由0.027、0.019 g/(m2·d)升至0.028、0.022g/(m2·d),p-CNB去除率由93.1%升至95.1%,升幅均不大,说明进水ρ(p-CNB)比氢气压力更能直接影响p-CNB和p-CAN的去除通量及p-CNB去除率.当量电子通量分配和还原动力学结果表明,p-CNB和p-CAN的还原对氢气压力升高的敏感性不强烈,进一步揭示降低进水中ρ(p-CNB)比提高氢气压力更能明显地促进微生物对p-CNB和p-CAN的去除效果.氢气压力变化对硫酸盐还原和反硝化的影响程度高于p-CNB或p-CAN的还原,当氢气可利用率受限时,p-CNB或p-CAN的还原会由于电子供体的竞争而受到抑制.The effects of influent substrate concentration and hydrogen pressure on bioreductive degradation of para-chloronitrobenzene（p-CNB） by autohydrogenotrophic microorganisms were systematically investigated based on hydrogen-based membrane biofilm reactor.Equivalent electron fluxes of bioreductions of electron acceptors and reduction kinetics in biofilm were also analyzed in this study.The results showed that increasing influent p-CNB concentration enhanced p-CNB and p-CAN flux from 0.014 and 0.011 g/（m^2·d） to 0.099 and 0.060 g/（m^2·d）,respectively,but reduced p-CNB removal percentage from 95.9% to 68.4%.As hydrogen pressure increased,p-CNB and p-CAN flux increased from 0.027 and 0.019 g/（m^2·d） to 0.028 and 0.022 g/（m^2·d）,respectively,and p-CNB removal percentage increased from 93.1% to 95.1%.The three modest increments indicated that influent p-CNB concentration affected removal fluxes and percentages of p-CNB and p-CAN more obviously than hydrogen pressure.The results of equivalent electron fluxes and reduction kinetics analysis showed that p-CNB and p-CAN bioreductions were less sensitive to increased hydrogen pressure,further revealing that decreasing p-CNB concentration improved removal efficiencies of p-CNB and p-CAN by microorganisms more significantly than increasing hydrogen pressure.The degree of influence of hydrogen pressure changes on sulfate reduction and denitrification was higher than p-CNB or p-CAN,which showed that hydrogen competition inhibition will be generated on p-CNB bioreduction when the hydrogen availability was limited.

关 键 词：氢基质生物膜反应器 对氯硝基苯(p-CNB) 生物还原 氢气 

分 类 号：X703[环境科学与工程—环境工程]