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DatoValore
TitleBiopolymers from Urban Organic Waste: Influence of the Solid Retention Time to Cycle Length Ratio in the Enrichment of a Mixed Microbial Culture (MMC)
AbstractIn this study, the performance of the selection process for polyhydroxyalkanoate (PHA) production from mixed microbial cultures (MMCs) at pilot scale was deeply investigated with the solid retention time (SRT) to cycle length (CL) ratio as main affecting parameter. Four different runs were tested by varying the SRT/CL ratio maintaining the same organic loading rate (OLR). The pilot-scale selection and accumulation reactors were fed with a fermented mixture of source-selected organic fraction of municipal solid waste (OFMSW) and waste activated sludge (WAS), refined with a centrifuge and membrane unit for the coarse solid removal. The selected biomass obtained in the most performing run was characterized by a specific storage rate of 375 mg CODP/g CODXa h and a storage yield of 0.46 CODP/CODSOL. Accumulations performed with the same biomass were characterized by a storage yield of 0.62 CODP/CODVFA. The microbiome composition was assessed. In the most performing run, putative PHA-storing bacteria affiliated with Paracoccus genus were found at high abundance (36.8%), in contrast to all other runs. An overall PHA yield of 110 g PHA/kg VS was estimated for the best scenario, revealing an interesting perspective for biorefinery technology chains based on the three-stage process for PHA production.
SourceACS sustainable chemistry & engineering 8 (38), pp. 14531–14539
Keywordsmixed microbial cultures (MMCs)polyhydroxyalkanoates (PHAs)urban organic wastesolid retention time to cycle length ratio (SRT/CL)biorefinery
JournalACS sustainable chemistry & engineering
EditorAmerican Chemical Society, Washington, DC, Stati Uniti d'America
Year2020
TypeArticolo in rivista
DOI10.1021/acssuschemeng.0c04980
AuthorsMoretto, Giulia; Lorini, Laura; Pavan, Paolo; Crognale, Simona; Tonanzi, Barbara; Rossetti, Simona; Majone, Mauro; Valentino, Francesco
Text440104 2020 10.1021/acssuschemeng.0c04980 ISI Web of Science WOS 000576678100027 mixed microbial cultures MMCs polyhydroxyalkanoates PHAs urban organic waste solid retention time to cycle length ratio SRT/CL biorefinery Biopolymers from Urban Organic Waste Influence of the Solid Retention Time to Cycle Length Ratio in the Enrichment of a Mixed Microbial Culture MMC Moretto, Giulia; Lorini, Laura; Pavan, Paolo; Crognale, Simona; Tonanzi, Barbara; Rossetti, Simona; Majone, Mauro; Valentino, Francesco Univ Ca Foscari Venice; Univ Roma La Sapienza; Natl Res Council Italy IRSA CNR In this study, the performance of the selection process for polyhydroxyalkanoate PHA production from mixed microbial cultures MMCs at pilot scale was deeply investigated with the solid retention time SRT to cycle length CL ratio as main affecting parameter. Four different runs were tested by varying the SRT/CL ratio maintaining the same organic loading rate OLR . The pilot scale selection and accumulation reactors were fed with a fermented mixture of source selected organic fraction of municipal solid waste OFMSW and waste activated sludge WAS , refined with a centrifuge and membrane unit for the coarse solid removal. The selected biomass obtained in the most performing run was characterized by a specific storage rate of 375 mg CODP/g CODXa h and a storage yield of 0.46 CODP/CODSOL. Accumulations performed with the same biomass were characterized by a storage yield of 0.62 CODP/CODVFA. The microbiome composition was assessed. In the most performing run, putative PHA storing bacteria affiliated with Paracoccus genus were found at high abundance 36.8% , in contrast to all other runs. An overall PHA yield of 110 g PHA/kg VS was estimated for the best scenario, revealing an interesting perspective for biorefinery technology chains based on the three stage process for PHA production. 8 Published version Articolo in rivista American Chemical Society 2168 0485 ACS sustainable chemistry engineering ACS sustainable chemistry engineering ACS sustainable chemistry engineering ACS sustain. chem. eng. TONANZI BARBARA simona.rossetti ROSSETTI SIMONA simona.crognale CROGNALE SIMONA