| Text | 481087 2022 10.1007/s13399 022 03659 8 Scopus 2 s2.0 85144539650 Dark fermentation Volatile fatty acids Sewage sludge Biorefinery 16S rRNA gene Volatile fatty acid production from hydrolyzed sewage sludge effect of hydraulic retention time and insight into thermophilic microbial community Gottardo M.; Crognale S.; Tonanzi B.; Rossetti S.; D Annibale L.; Dosta J.; Valentino F. Department of Environmental Sciences, Informatics and Statistics, Ca Foscari University of Venice, Via Torino 155, Mestre Venice, 30172, Department of Environmental Sciences, Informatics and Statistics, Ca Foscari University of Venice, Via Torino 155, 30172, Mestre Venice, Italy, , Italy; Water Research Institute, National Research Council of Italy, CNR IRSA, Area Della Ricerca RM1, Via Salaria km 29.300, Rome, Monterotondo, 00015, Water Research Institute, National Research Council of Italy, CNR IRSA, Area Della Ricerca RM1, Via Salaria km 29.300, Rome, 00015, Monterotondo, Italy, , , Italy; Water Research Institute, National Research Council of Italy, CNR IRSA, Area Della Ricerca RM1, Via Salaria km 29.300, Rome, Monterotondo, 00015, Water Research Institute, National Research Council of Italy, CNR IRSA, Area Della Ricerca RM1, Via Salaria km 29.300, Rome, 00015, Monterotondo, Italy, , , Italy; Department of Chemistry, La Sapienza University of Rome, P.le Aldo Moro 5, Rome, 00185, Department of Chemistry, La Sapienza University of Rome, P.le Aldo Moro 5, 00185, Rome, Italy, , Italy; Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, C/Marti i Franques 1, Barcelona, Department of Chemical Engineering and Analytical Chemistry, University of Barcelona, C/Marti i Franques 1, Barcelona, Spain, , Spain The disposal of sewage sludge potentially reaches 50 60% of the total operation cost of a wastewater treatment plant. Given its high content of organic material, adopting effective technologies for sewage sludge treatment minimizes its environmental impact and the parallel conversion of the organics into recovered bio products. Hence, the such stream can be viewed as a renewable carbon source to produce high value products such as volatile fatty acids VFA . Short time 8 h alkaline pH 9 11 and thermal 70 85 °C hydrolysis were applied to enhance the acidogenic fermentability of thickened sewage sludge. Mild thermal hydrolysis 70 °C was chosen as the best performing method to increase the soluble chemical oxygen demand COD and boost the VFA production in the following dark fermentation process, designed at three different hydraulic retention times 4.0, 5.0, and 6.0 days . The highest acidification yield 0.30 g COD/g VS and COD/COD ratio 0.73 were obtained at 6.0 days as hydraulic retention time. Microbial community analysis performed at the end of semi continuous tests showed the occurrence of several fermentative bacteria i.e., Coprothermobacteraceae, Planococcaceae, Thermoanaerobacteraceae responsible for the fermentation of complex organic matters mainly into acetic, propionic, and butyric acids, which dominated the VFA spectrum. Published version http //www.scopus.com/record/display.url eid=2 s2.0 85144539650 origin=inward Articolo in rivista 2190 6815 Biomass Conversion and Biorefinery Biomass Conversion and Biorefinery TONANZI BARBARA simona.rossetti ROSSETTI SIMONA simona.crognale CROGNALE SIMONA |
