Kinetic study of two-step mesophilic anaerobic-aerobic waste sludge digestion: Focus on biopolymer fate.
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| Title: | Kinetic study of two-step mesophilic anaerobic-aerobic waste sludge digestion: Focus on biopolymer fate. |
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| Authors: | Mosca Angelucci, Domenica1 (AUTHOR), Di Cesare, Sara M.1 (AUTHOR), Tomei, M. Concetta1 (AUTHOR) tomei@irsa.cnr.it |
| Source: | Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B. Aug2018, Vol. 118, p106-114. 9p. |
| Subject Terms: | *Sewage sludge digestion, *Sewage disposal plants, *Suspended solids, *Anaerobic digestion, *Sewage sludge, Michaelis-Menten equation |
| Abstract: | • Kinetics of anaerobic aerobic digestion of waste sludge was investigated. • The study focus was on biopolymer fate and their effects on sludge dewaterability. • Solid degradation and biopolymer trends were investigated in both digestion units. • A kinetic model was formulated to analyze the protein and carbohydrate pattern. • Successful validation confirmed the reliability of the proposed model. Kinetics of the sequential anaerobic–aerobic digestion operated under mesophilic conditions on waste activated sludge of a full-scale wastewater treatment plant was investigated. Special focus was given to the fate of proteins and carbohydrates, given the influence of biopolymers on dewatering properties of the sludge. Kinetic tests were performed to characterize the suspended solid degradation and the trend of biopolymers in both digestion steps. Volatile solid degradation rates were 0.93 and 0.52 kg VS m−3 d−1 in anaerobic and aerobic conditions, respectively. Different models (1st order, Michaelis-Menten, Valentini and Contois) have been compared for VS degradation: Contois equation provided the best data fitting (correlation coefficients ≥0.99). Evolution of biopolymers during two-step process exhibited a similar pattern: during the anaerobic phase, an increase of about one order of magnitude was observed for carbohydrates and of 100% for proteins, while in the aerobic bioreactor both decreased of 29 and 73%, respectively. Data from kinetic tests were employed to model the biopolymer patterns taking into account their production from the hydrolysis of particulate organic substrate and their biodegradation in the different anaerobic and aerobic reaction environments. Michaelis-Menten equation gave satisfactory predictions of the biopolymer fate with correlation coefficients ranging from 0.92 to 0.97, for both carbohydrates and proteins. [ABSTRACT FROM AUTHOR] |
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| Abstract: | • Kinetics of anaerobic aerobic digestion of waste sludge was investigated. • The study focus was on biopolymer fate and their effects on sludge dewaterability. • Solid degradation and biopolymer trends were investigated in both digestion units. • A kinetic model was formulated to analyze the protein and carbohydrate pattern. • Successful validation confirmed the reliability of the proposed model. Kinetics of the sequential anaerobic–aerobic digestion operated under mesophilic conditions on waste activated sludge of a full-scale wastewater treatment plant was investigated. Special focus was given to the fate of proteins and carbohydrates, given the influence of biopolymers on dewatering properties of the sludge. Kinetic tests were performed to characterize the suspended solid degradation and the trend of biopolymers in both digestion steps. Volatile solid degradation rates were 0.93 and 0.52 kg VS m−3 d−1 in anaerobic and aerobic conditions, respectively. Different models (1st order, Michaelis-Menten, Valentini and Contois) have been compared for VS degradation: Contois equation provided the best data fitting (correlation coefficients ≥0.99). Evolution of biopolymers during two-step process exhibited a similar pattern: during the anaerobic phase, an increase of about one order of magnitude was observed for carbohydrates and of 100% for proteins, while in the aerobic bioreactor both decreased of 29 and 73%, respectively. Data from kinetic tests were employed to model the biopolymer patterns taking into account their production from the hydrolysis of particulate organic substrate and their biodegradation in the different anaerobic and aerobic reaction environments. Michaelis-Menten equation gave satisfactory predictions of the biopolymer fate with correlation coefficients ranging from 0.92 to 0.97, for both carbohydrates and proteins. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09575820 |
| DOI: | 10.1016/j.psep.2018.06.008 |
