Removal of nitric oxide from simulated flue gas via denitrification in a hollow-fiber membrane bioreactor.
Removal of nitric oxide from simulated flue gas via denitrification in a hollow-fiber membrane bioreactor.
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DOI：
10.1016/s1001-0742(12)60285-x
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发表时间：
2013-11
影响因子：
6.9
通讯作者：
Xinyu Zhang;Ruofei Jin;Guangfei Liu;Xiyang Dong;Ji-ti Zhou;Aijie Wang
中科院分区：
文献类型：
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作者：
Xinyu Zhang;Ruofei Jin;Guangfei Liu;Xiyang Dong;Ji-ti Zhou;Aijie Wang
研究了中空纤维膜生物反应器（HMBR）处理模拟烟气中一氧化氮（NO）的能力。HMBR运行了9个月，显示出最大的去除能力为702 mg NO/（m2天），去除效率为86%（气体停留时间为30秒，入口NO浓度为2680 mg/m3，pH 8）。测试了不同的操作参数，以确定HMBR的稳定性和响应。HMBR中NO的去除受NO浓度和气体停留时间的影响。NO去除能力随进气NO浓度的增加或气体停留时间的缩短而增加。在较长的气体停留时间或较低的NO浓度下，NO的脱除效率较高。HMBR的微生物群落对pH值和碱性的变化敏感，对应的最佳pH值为8。NO的去除能力和去除效率与进气氧浓度成反比。SO2对HMBR的NO去除能力和去除效率影响不大。通过产物分析研究了HMBR中N2O和N2的产生情况，证实HMBR中绝大多数微生物为硝化细菌。与其他处理NO的生物反应器相比，本研究表明，厌氧HMBR是一种很好的NO去除方法。
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/(m2day) with a removal efficiency 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 efficiency 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 efficiency were inversely proportional to the inlet oxygen concentration. Sulfur dioxide had no great influence on elimination capacity and removal efficiency of NO. Product analysis was performed to study N2O and N2production 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.