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Effect of a high strength chemical industry wastewater on microbial community dynamics and mesophilic methane generation
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作者 Harish Venkatakrishnan Youming Tan +6 位作者 Maszenan bin Abdul Majid Santosh Pathak Antonius Yudi Sendjaja Dongzhe Li Jerry Jian Lin Liu Yan Zhou Wun Jern Ng 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第4期875-884,共10页
A high strength chemical industry wastewater was assessed for its impact on anaerobic microbial com- munity dynamics and consequently mesophilic methane generation. Cumulative methane production was 251 mL/g total che... A high strength chemical industry wastewater was assessed for its impact on anaerobic microbial com- munity dynamics and consequently mesophilic methane generation. Cumulative methane production was 251 mL/g total chemical oxygen demand removed at standard temperature and pressure at the end of 30 days experimental period with a highest recorded methane percentage of 80.6% of total biogas volume. Volatile fatty acids (VFAs) analysis revealed that acetic acid was the major intermediate VFAs produced with propionic acid accumulating over the experimental period. Quantitative analysis of microbial communities in the test and control groups with quantitative real time polymerase chain reaction highlighted that in the test group, Eubacteria (96.3%) was dominant in comparison with methanogens (3.7%). The latter were dominated by Methanomicrobiales and Methanobacteriales while in test groups increased over the experimental period, reaching a maximum on day 30. Denaturing gradient gel electrophoresis profile was performed, targeting the 16S rRNA gene of Eubacteria and Archaea, with the DNA samples extracted at 3 different time points from the test groups. A phylogenetic tree was constructed for the sequences using the neighborhood joining method. The analysis revealed that the presence of organisms resembling Syntrophomonadaceae could have contributed to increased production of acetic and propionic acid intermediates while decrease of organisms resembling Pelotomaculum sp. could have most likely contributed to accumulation of propionic acid. This study suggested that the degradation of organic components within the high strength industrial wastewater is closely linked with the activity of certain niche microbial communities within eubacteria and methanogens. 展开更多
关键词 biochemical methane potential biogas community dynamics denaturing gradient gel electrophoresis industrial chemical wastewater quantitative real-time PCR
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INCREASING RETURNS TO SCALE,DYNAMICS OF INDUSTRIAL STRUCTURE AND SIZE DISTRIBUTION OF FIRMS 被引量:5
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作者 Ying FAN Menghui LI Zengru DI 《Journal of Systems Science and Systems Engineering》 SCIE EI CSCD 2006年第1期19-33,共15页
关键词 Increasing returns industry dynamics size distribution of firms
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