膜生物反应器反硝化烟气脱汞研究

Nitrate-driven Denitrifying Membrane Bioreactor for Mercury Removal in Flue Gas

作者构建了硝酸盐驱动的反硝化膜生物反应器,膜生物反应器能够有效烟气脱汞,汞的去除效率可达88.72%。通过反应器生物膜SEM-EDS、XPS、HPLC表征分析,SEM-EDS发现菌体表面对Hg成功进行了吸附;XPS分析表明与Hg^(0)接触后微生物产生HgCl_(2)特征峰;HPLC分析发现Hg^(0)转化为Hg^(2+)与MeHg。采用16S rDNA研究膜生物反应器微生物群落结构,结果表明,随着长时间运行,汞进气负荷导致微生物的群落多样性先降低后升高,40、90与230 d的优势菌属分别为Thauera、Brachymonas、TissierellaSoehngenia;Halomonas、Zobellella、Acholeplasma;Halomonas、Aeromonadaceaebacterium、LNRA2-18、Olivibacter。

A nitrate-driven denitrifying polypropylene hollow fiber membrane bioreactor was constructed to study flue gas mercury removal.Denitrifying bacteria membrane bioreactor can effectively remove mercury from flue gas.The removal efficiency of mercury can reach 88.72%.The microbial morphology of the reactor was observed by SEM.EDS showed that Hg was successfully adsorbed on the surface of the microorganism.XPS analysis showed that HgCl_(2)peaks were produced by the microorganism after contact with Hg^(0).HPLC analysis showed that Hg^(0)was transformed into Hg^(2+)and MeHg.The microbial community structure was elucidated by 16 S rDNA.The increase of long-term mercury load led to the decrease of microbial diversity and then increase.The dominant genera were Thauera、Brachymonas、TissierellaSoehngenia at 40 d;Halomonas、Zobellella、Acholeplasma at 90 d;Halomonas、Aeromonadaceaebacterium、LNRA2-18、Olivibacter at 230 d.