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氧含量对嗜热膜生物反应器烟气脱硝脱汞的影响
The effect of oxygen concentration on simultaneous NO and Hg0 removal in a thermophilic membrane biofilm reactor
投稿时间:2018-05-21  修订日期:2018-07-10
DOI:
中文关键词:  氧含量  烟气脱硝脱汞  膜污染  微生物
英文关键词:Oxygen concentration  denitration and demercuration  Membrane fouling  Microbia
基金项目:国家自然科学基金
作者单位E-mail
喻珊 中山大学环境科学与工程学院 842847801@qq.com 
黄振山 中山大学环境科学与工程学院  
唐美如 中山大学环境科学与工程学院  
张再利 中山大学环境科学与工程学院  
樊青娟 中山大学环境科学与工程学院  
魏在山 中山大学环境科学与工程学院 weizaishan98@163.com 
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中文摘要:
      研究氧含量对嗜热膜生物反应器烟气脱硝脱汞性能及微生物群落结构的影响,结果表明氧含量为2%、6%和10%时NO去除效率均稳定在80%,氧含量为17%时氧促进NO降解,NO去除效率达91.0%;Hg0去除效率随氧含量的增加而升高,氧含量为17%时Hg0去除效率可达92.0%。氧含量的增加促进氨氮的降解,且有利于硝化反应的进行。缺氧和厌氧环境有利于减少膜污染,FT-IR结果表明氧含量影响EPS中官能团含量和成分。16S rDNA结果表明氧含量10%中好氧反硝化菌占比重最高。Zobellella,Paracoccus,Bacillus,Alcaligenes,Arthrobacter,Acinetobacter,Pseudomonas均为好氧反硝化菌。
英文摘要:
      In the present study, effects of oxygen concentration on simultaneous denitration and demercuration performance, and microbial community in thermophilic membrane bioreactor (TMBR) have been evaluated. The removal of NO and Hg0 under oxygen concentration of 17% in TMBR presented the highest efficiency among four typical oxygen concentrations, especially, removal efficiency of NO was high up to 91.0%. Removal efficiency of NO all approached 80% when oxygen concentration was 2%, 6%, and 10%, whereas the removal efficiency of Hg0 was gradually enhanced with the increased oxygen concentration. In particular, removal efficiency of Hg0 achieved 92.0% in the presence of 17% of oxygen concentration. Results suggest that increased oxygen concentration could facilitate the degradation of ammonia nitrogen, which was beneficial to the nitrification. Anaerobic and anoxic environment may mitigate membrane fouling. FT-IR results indicate that oxygen concentration affected the concentration and composition of functional groups of EPS. According to analysis results of microbial community in TMBR using 16S rDNA technique, the abundance of aerobic denitrifying bacteria was the hightest in TMBR under 10% of oxygen concentration. Moreover, Zobellella, Paracoccus, Bacillus, Alcaligenes, Arthrobacter, Acinetobacter, Pseudomonas were aerobic denitrifying bacteria.
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