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Thermophilic two-phase anaerobic digestion of source-sorted organic fraction of municipal solid waste for bio-hythane production: Effect of recirculation sludge on process stability and microbiology over a long-term pilot-scale experience

TitleThermophilic two-phase anaerobic digestion of source-sorted organic fraction of municipal solid waste for bio-hythane production: Effect of recirculation sludge on process stability and microbiology over a long-term pilot-scale experience
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2014
AuthorsGiuliano, Antonio, Zanetti L., Micolucci F., and Cavinato C.
JournalWater Science and Technology
Volume69
Pagination2200-2209
ISSN02731223
Keywordsalkalinity, Ammonia, Anaerobic digestion, Anaerobiosis, anoxic conditions, Archaea, article, Bacteria, Bio-hythane, biofuel, Biogas, Bioreactors, Chemical analysis, community composition, community dynamics, Dark fermentation, Degradation, evaporation, Fermentation, Fluid, Food, Food waste, Free ammonia inhibition, Hot Temperature, Hydrogen, inhibition, Inoculation, Lactobacillus, methane, Methanobacteriales, methanogen, Methanosarcinales, Methanothermobacter, microbial activity, Microbial communities, Microbial community, Municipal solid waste, nonhuman, organic matter, pH, Phylogeny, Pilot Projects, Reaction kinetics, sewage, sludge, solid waste, stirred reactor, Temperature, Time Factors, Waste disposal, Waste treatment
Abstract

A two-stage thermophilic anaerobic digestion process for the concurrent production of hydrogen and methane through the treatment of the source-sorted organic fraction of municipal solid waste was carried out over a long-term pilot scale experience. Two continuously stirred tank reactors were operated for about 1 year. The results showed that stable production of bio-hythane without inoculum treatment could be obtained. The pH of the dark fermentation reactor was maintained in the optimal range for hydrogen-producing bacteria activity through sludge recirculation from a methanogenic reactor. An average specific bio-hythane production of 0.65 m3 per kg of volatile solids fed was achieved when the recirculation flow was controlled through an evaporation unit in order to avoid inhibition problems for both microbial communities. Microbial analysis indicated that dominant bacterial species in the dark fermentation reactor are related to the Lactobacillus family, while the population of the methanogenic reactor was mainly composed of Defluviitoga tunisiensis. The archaeal community of the methanogenic reactor shifted, moving from Methanothermobacter-like to Methanobacteriales and Methanosarcinales, the latter found also in the dark fermentation reactor when a considerable methane production was detected. © IWA Publishing 2014.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84902334188&doi=10.2166%2fwst.2014.137&partnerID=40&md5=326c08105cdd605d277fa8406d325f85
DOI10.2166/wst.2014.137
Citation KeyGiuliano20142200