Predominant Contribution of Syntrophic Acetate Oxidation to Thermophilic Methane Formation at High Acetate Concentrations

LI-PING HAO; FAN  LO; PIN-JING  HE

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Predominant Contribution of Syntrophic Acetate Oxidation to Thermophilic Methane Formation at High Acetate Concentrations

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To quantify the contribution of syntrophic acetate oxidation to thermophilic anaerobic methanogenesis under the stressed condition induced by acidification, the methanogenic conversion process of 100 mmol/L acetate was monitored simultaneously by using isotopic tracing and selective inhibition techniques, supplemented with the analysis of unculturable microorganisms. Both quantitative methods demonstrated that, in the presence of aceticlastic and hydrogenotrophic methanogens, a large percentage of methane (up to 89) wasinitially derived from CO2 reduction, indicating the predominant contribution of the syntrophic acetate oxidation pathway to acetate degradation at high acid concentrations. A temporal decrease of the fraction of hydrogenotrophic methanogenesis from, more than 60 to less than 40 reflected the gradual prevalence of the aceticlastic methanogenesis pathway along with the reduction of acetate. This apparent discrimination of acetate methanization pathways highlighted the importance df the syntrophic acetate-oxidizing bacteria to initialize methanogenesis from high organic loadings.

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《Environmental Science & Technology: ES&T》 |2011年第2期|508-513|共6页
作者
LI-PING HAO; FAN LO; PIN-JING HE;
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作者单位

State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment,College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, P.R. China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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正文语种英语
中图分类环境科学、安全科学;
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Predominant Contribution of Syntrophic Acetate Oxidation to Thermophilic Methane Formation at High Acetate Concentrations

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