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Removal of nitric oxide from simulated flue gas via denitrification in a hollow-fiber membrane bioreactor

查看全文 作　　者：Xinyu [1]Zhang;Ruofei [1,2]Jin;Guangfei [1]Liu;Xiyang [1]Dong;Jiti [1]Zhou;Aijie [2]Wang 高影响力作者 机构地区：[1]Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology,Dalian University of Technology;[2]State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology高影响力机构 出　　处：《Journal of Environmental Sciences》索引2013年第25卷第11期,共8页高影响力期刊 基　　金：supported by Open Project of State Key Laboratory of Urban Water Source and Environment,Harbin Institute of Technology(No.QA201313) 摘　　要：A hollow-fiber membrane bioreactor(HMBR) was studied for its ability to treat nitric oxide(NO) from simulated flue gas. The HMBR was operated for 9 months and showed a maximum elimination capacity of 702 mg NO/(m2·day) with a removal efciency of 86%(gas residence time of 30 sec, inlet NO concentration of 2680 mg/m3, pH 8). Varying operation parameters were tested to determine the stability and response of the HMBR. Both the inlet NO concentration and gas residence time influenced the removal of NO in the HMBR. NO elimination capacity increased with an increase in inlet NO concentration or a shortening of gas residence time. Higher removal efciency of NO was obtained at a longer gas residence time or a lower inlet NO concentration. Microbial communities of the HMBR were sensitive to the variation in pH value and alkalescence corresponding to an optimum pH value of 8. In addition, NO elimination capacity and removal efciency were inversely proportional to the inlet oxygen concentration. Sulfur dioxide had no great influence on elimination capacity and removal efciency of NO. Product analysis was performed to study N2O and N2 production and confirmed that the majority of the microorganisms were denitrifying bacteria in the HMBR. Compared to other bioreactors treating NO, this study showed that the denitrifying HMBR was a good option for the removal of NO. 关 键 词：膜生物反应器 反硝化细菌 一氧化氮 模拟烟气 中空纤维 气体停留时间 氧气浓度 最适PH值
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