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论文类型：期刊论文

发表时间：2013-11-01

发表刊物：JOURNAL OF ENVIRONMENTAL SCIENCES

收录刊物：SCIE、EI、PubMed、ISTIC、Scopus

卷号：25

期号：11

页面范围：2239-2246

ISSN号：1001-0742

关键字：nitric oxide; denitrification; hollow-fiber membrane bioreactor; biofilm

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/(m(2).day) with a removal efficiency of 86% (gas residence time of 30 sec, inlet NO concentration of 2680 mg/m(3), 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 N-2 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.