Anaerobic co-digestion of the aqueous phase from hydrothermally treated waste activated sludge with primary sewage sludge. A kinetic study
Entity
UAM. Departamento de Ingeniería QuímicaPublisher
ElsevierDate
2018-11-03Citation
10.1016/j.jenvman.2018.10.031
Journal of Environmental Management 231 (2019): 726-733
ISSN
0301-4797 (print)DOI
10.1016/j.jenvman.2018.10.031Funded by
The authors greatly appreciate financial support from the SpanishMINECO (Project CTM2016-76564-R) and the Community of Madrid(Project P2013/MAE-2716). M.A. de la Rubia acknowledges financialsupport from the Spanish MINECO (RYC-2013-12549). The valuablecontribution of NProject
Gobierno de España. CTM2016-76564-R; Comunidad de Madrid. P2013/MAE-2716/REMTAVARESEditor's Version
https://doi.org/10.1016/j.jenvman.2018.10.031Subjects
Anaerobic co-digestion (AcoD); Biochemical methane potential (BMP); Hydrothermal carbonization (HTC); Kinetic model; Primary sewage sludge; Sewage sludge; QuímicaRights
© 2018 Elsevier Ltd.Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
The mesophilic anaerobic co-digestion of the liquid fraction from hydrothermal carbonization (LFHTC) of dewatered waste activated sludge with primary sewage sludge (PSS) has been studied. Mixtures of different composition (25, 50 and 75% of LFHTC on a chemical oxygen demand (COD) basis), as well as the individual substrates, have been tested using two inocula (flocculent (FS) and granular (GS) sludges). Methane production decreased as the LFHTC/PSS ratio increased, which can be related to the presence of recalcitrant compounds in the LFHTC, such as alkenes, phenolics, and other oxygen- and nitrogen-bearing aromatics hard-to-degrade through anaerobic digestion. Methane yield reached 248 ± 11 mL CH4 STP/g CODadded with the GS inoculum and 25% LFHTC. A 74 and a 30% increase of methane production was achieved in the 25% LFHTC runs respect to the obtained in the similar experiments with 100% LFHTC, using the FS and GS inocula, respectively. In those late runs, the COD was reduced more than 86%, with a negligible concentration of total volatile fatty acids. With both inocula, total Kjeldahl nitrogen hydrolysis increased as the LFHTC to PSS mixture ratio decreased, reaching values higher than 79% at the end of the experiments. Methane yield values fitted well the first-order, Cone and Weibull kinetic models for both inocula. Significant differences in the kinetic constant values, ranging from 0.100 to 0.168 d−1 and 0.059–0.068 d−1, were found with the FS and GS inocula, respectively. The results obtained support the potential integration of HTC of dewatered waste activated sludge in wastewater treatment plants
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Google Scholar:Villamil, John A.
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Fernández Mohedano, Ángel
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Rodriguez, Juan J.
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Rubia Romero, María de los Ángeles de la
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