Zhi-Ye Wang

Zhejiang University, Hang-hsien, Zhejiang Sheng, China

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Publications (2)0.99 Total impact

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    ABSTRACT: The emission of nitric oxide (NO) to the atmosphere is a major environmental problem. To abate NO emission from the industrial flue gas, a rotating drum biofilter (RDB) was developed for the denitrifying removal of NO. After the start-up period, the RDB could effectively remove NO from the waste gas and the denitrifying removal efficiency could reach 85%. After the addition of Cu(II)(EDTA) to the nutrients, the removal efficiency could increase to 99.1%. To improve the understanding of the relationship between the composition of bacterial population and the performance of the RDB, a denaturing gradient gel electrophoresis (DGGE) of polymerase chain reaction-amplified genes coding for 16S rRNA was used to analyze and determine the changes in bacterial communities in the RDB. Results showed that there was a slight change in microbial diversity after the addition of Cu(II)(EDTA) to the nutrient solution, which led to an increase in NO removal efficiency. Eight major bands of 16S rRNA gene fragments obtained from the DGGE gels of biofilm samples were further purified, reamplified, cloned, and sequenced. Phylogenetic analysis identified sixteen types of micro-organisms in the RDB. Sequences of these fragments were compared with those listed in the database of the GeneBank (National Center for Biotechnology Information). Gene analysis of 16S rRNA showed that the major populations were Clostridium sp., beta-proteobacterium, gamma-proteobacterium, and Cytophaga-Flexibacteria-Bacteroides (CFB) groups. In addition, it was concluded that denitrification was caused by the organism with DNA represented by bands labelled G-5, G-6, and G-8. G-5 was related to a gamma-proteobacterium, whereas those labeled G-6 and G-8 were related to a beta-proteobacterium.
    No preview · Article · Jul 2009 · Environmental Engineering Science
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    ABSTRACT: PCR-DGGE was applied to analyze the microbial communities in rotating drum biofilter (RDB) for nitric oxide denitrifying removal under anaerobic conditions. The 16S rRNA genes (V3 region) were amplified with two universal primers (338F-GC and 518R). These amplified DNA fragments were separated by parallel DGGE. The DGGE profiles of biofilm samples from different sections of RDB are similar and about sixteen types of microorganisms are identified in the biofilm samples. These results show that microbial diversity of RDB firstly increases but then decreases with the addition of Cu II (EDTA) and the increase of NO removal efficiency. However, the change of microbial community is not significant during the process. Eight major bands of 16S rRNA genes fragments from DGGE profiles of biofilm samples were further eluted from gel, re-amplified, cloned and sequenced. The sequences of these fragments were compared with the database in GeneBank (NCBI). The gene analysis of 16S rRNA showed that the major populations are Cytopahga-Flexibacteria-Bacteroides (CFB) group Bacteroides, beta -Proteobacterium, gamma-Proteobacterium and Clostridium sp.. In addition, denitrification is related with band G-5, G-6 and G-8. G-5 is affiliated with gamma-Proteobacterium. Both G-6 and G-8 are affiliated with beta-Proteobacterium.
    No preview · Article · Apr 2008 · Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.]