In the present study, the chemical features of municipal wastewater sludges treated in two-phase separate digesters (one for acetogenesis and the other one for methanogenesis), were characterized by using chemical analysis, stable carbon isotope ratios (δ13C), HS-SPME-GC-MS, TG-DTA analysis and DRIFT spectroscopy. The results obtained showed that sludges from acetogenesis and methanogenesis differed from each other, as well as from influent raw sludges. Both processes exhibited a diverse chemical pattern in term of VFA and VOC. Additional variations were observed for δ13C values that changed from acetogenesis to methanogenesis, as a consequence of fermentation processes that led to a greater fractionation of 12C with respect to the 13C isotope. Similarly, the thermal profiles of acetogenesis and methanogenesis sludges greatly differed in terms of heat combustion produced. These changes were also supported by a higher lipid content, (probably fatty acids) in acetogenesis than in methanogenesis, as also shown by DRIFT spectroscopy.
Chemical characterization of municipal wastewater sludges produced by two-phase anaerobic digestion for biogas production / O. Francioso; M. T. Rodriguez-Estrada; D. Montecchio; C. Salomoni; A. Caputo; D. Palenzona. - In: JOURNAL OF HAZARDOUS MATERIALS. - ISSN 0304-3894. - ELETTRONICO. - 175:(2010), pp. 740-746. [10.1016/j.jhazmat.2009.10.071]
Chemical characterization of municipal wastewater sludges produced by two-phase anaerobic digestion for biogas production
FRANCIOSO, ORNELLA;RODRIGUEZ ESTRADA, MARIA TERESA;MONTECCHIO, DANIELA;PALENZONA, DOMENICO
2010
Abstract
In the present study, the chemical features of municipal wastewater sludges treated in two-phase separate digesters (one for acetogenesis and the other one for methanogenesis), were characterized by using chemical analysis, stable carbon isotope ratios (δ13C), HS-SPME-GC-MS, TG-DTA analysis and DRIFT spectroscopy. The results obtained showed that sludges from acetogenesis and methanogenesis differed from each other, as well as from influent raw sludges. Both processes exhibited a diverse chemical pattern in term of VFA and VOC. Additional variations were observed for δ13C values that changed from acetogenesis to methanogenesis, as a consequence of fermentation processes that led to a greater fractionation of 12C with respect to the 13C isotope. Similarly, the thermal profiles of acetogenesis and methanogenesis sludges greatly differed in terms of heat combustion produced. These changes were also supported by a higher lipid content, (probably fatty acids) in acetogenesis than in methanogenesis, as also shown by DRIFT spectroscopy.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
