| Abstract | The integrated-multistage process proposed herein is a practical example of a biorefinery platform in which the organic fraction of municipal solid waste (OFMSW) is used as a valued source for polyhydroxyalkanoates (PHA) and biogas production. Technical and economical feasibilities of this approach have been demonstrated at pilot-scale, providing a possible upgrade to traditional biowaste management practices, presently based on anaerobic digestion (AD). A pH-controlled OFMSW fermentation stage produced a liquid VFA rich stream with a high VFA/CODSOL ratio (0.90 COD/COD) that was easily used in the following aerobic stages for biomass and PHA production. The solid fraction was valorized into biogas through AD, obtaining energy and minimizing secondary flux waste generation. The reliable biomass enrichment was demonstrated by a stable feast-famine regime and supported by microbial community analysis. The selected consortium accumulated PHA up to 55% wt. Compared to the traditional AD process in an urban scenario of 900000 AE, the integrated approach for OFMSW valorization is preferable, and it is characterized by an electrical energy production of 85.7
MWh/d and 1.976 t/d as PHA productivity. The proposed process was also evaluated as economically sustainable if the PHA is marketed from 0.90 EUR/kg as the minimum threshold to a higher market price. |
| Text | 398904 2018 10.1021/acssuschemeng.8b03454 Scopus 2 s2.0 85056087661 ISI Web of Science WOS WOS 000452344900052 Anaerobic digestion; Mixed microbial culture MMC ; Organic fraction of municipal solid waste OFMSW ; Polyhydroxyalkanoates PHA ; Renewable feedstock; Volatile fatty acid VFA Organic Fraction of Municipal Solid Waste Recovery by Conversion into Added Value Polyhydroxyalkanoates and Biogas Valentino F.; Gottardo M.; Micolucci F.; Pavan P.; Bolzonella D.; Rossetti S.; Majone M. Department of Chemistry, La Sapienza University of Rome, P.le Aldo Moro 5, Rome, 00185, , Italy; Department of Chemical Engineering, Lund University, PO Box 124, Lund, SE 221 00, , Sweden; Department of Biotechnology, University of Verona, Strada Le Grazie 15, Verona, 37134, , Italy; Water Research Institute, National Research Council CNR , Via Salaria km 29, 300, Monterotondo RM , 00015, , Italy The integrated multistage process proposed herein is a practical example of a biorefinery platform in which the organic fraction of municipal solid waste OFMSW is used as a valued source for polyhydroxyalkanoates PHA and biogas production. Technical and economical feasibilities of this approach have been demonstrated at pilot scale, providing a possible upgrade to traditional biowaste management practices, presently based on anaerobic digestion AD . A pH controlled OFMSW fermentation stage produced a liquid VFA rich stream with a high VFA/CODSOL ratio 0.90 COD/COD that was easily used in the following aerobic stages for biomass and PHA production. The solid fraction was valorized into biogas through AD, obtaining energy and minimizing secondary flux waste generation. The reliable biomass enrichment was demonstrated by a stable feast famine regime and supported by microbial community analysis. The selected consortium accumulated PHA up to 55% wt. Compared to the traditional AD process in an urban scenario of 900000 AE, the integrated approach for OFMSW valorization is preferable, and it is characterized by an electrical energy production of 85.7 MWh/d and 1.976 t/d as PHA productivity. The proposed process was also evaluated as economically sustainable if the PHA is marketed from 0.90 EUR/kg as the minimum threshold to a higher market price. 6 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85056087661 origin=inward Organic Fraction of Municipal Solid Waste Recovery by Conversion into Added Value Polyhydroxyalkanoates and Biogas ACS Sustainable Chem. Eng. 6, 16375 16385, 2018 Valentino et al ACS SCE2018.pdf Articolo in rivista American Chemical Society 2168 0485 ACS sustainable chemistry engineering ACS sustainable chemistry engineering ACS sustainable chemistry engineering ACS sustain. chem. eng. simona.rossetti ROSSETTI SIMONA |
