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Zahedi, Soraya; Sales, Diego; Romero, Luis‐Isidoro; Solera, Rosario

Biomethanization from sulfate‐containing municipal solid waste: effect of molybdate on microbial consortium

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  • Medientyp: E-Artikel
  • Titel: Biomethanization from sulfate‐containing municipal solid waste: effect of molybdate on microbial consortium
  • Beteiligte: Zahedi, Soraya; Sales, Diego; Romero, Luis‐Isidoro; Solera, Rosario
  • Erschienen: Wiley, 2014
  • Erschienen in: Journal of Chemical Technology & Biotechnology
  • Sprache: Englisch
  • DOI: 10.1002/jctb.4215
  • ISSN: 0268-2575; 1097-4660
  • Entstehung:
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  • Beschreibung: <jats:title>Abstract</jats:title><jats:sec><jats:title>BACKGROUND</jats:title><jats:p><jats:bold>The effect of molybdate on a microbial consortium of dry thermophilic anaerobic digestion (AD) from sulfate‐containing municipal solid waste was studied</jats:bold>.</jats:p></jats:sec><jats:sec><jats:title>RESULTS</jats:title><jats:p><jats:bold>The study showed molybdate inhibition affecting hydrolysis, acidogenesis, and methanogenesis, but the main microbial populations in AD can sustain the molybdate load over a short period of time. Molybdate was not a bactericide for all members of the principal groups, only a few of them are affected. Although all the microbial populations decreased, the weakest groups were sulfate reducing bacteria (SRBs) and butyrate‐utilising acetogens (BUAs) and the most resistant group was propionate‐utilising acetogens (PUAs). Prior to using molybdate, the relative percentages were: <jats:italic>Eubacteria</jats:italic>:<jats:italic>Archaea</jats:italic> 80:20; acetogens 25% (BUAs 11% and PUAs 14%) and SRBs 17%. After molybdate addition the relative percentages were: <jats:italic>Eubacteria</jats:italic>:<jats:italic>Archaea</jats:italic> were 83:17, acetogens remained over 28% (BUAs 8% and PUAs 20%) and SRBs around 11%. The relation between acetate‐utilising methanogens (AUMs) and hydrogen‐utilising methanogens (HUMs) changed slightly from 55:45 to 53:47</jats:bold>.</jats:p></jats:sec><jats:sec><jats:title>CONCLUSION</jats:title><jats:p><jats:bold>All biochemical reactions in AD were inhibited and an increase in food:microorganism(F:M) ratio was observed. The microorganism's removal rates and growth inhibition rates are indicators of inhibitory effect in all analysed populations by inhibitor addition. © 2013 Society of Chemical Industry</jats:bold></jats:p></jats:sec>