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Kinetics of forced aerated biodegradation of digested sewage sludge-reed mixtures at different temperatures.
J Environ Manage. 2012 Mar; 95 Suppl:S128-33.JE

Abstract

This work presents a kinetic analysis of the aerobic biodegradation of anaerobically digested sewage sludge and dried reed mixtures at different temperatures. Batch experiments were conducted in laboratory-scale reactors with temperature (T) control and forced aeration of the solid mixture. The biowaste mixture was treated at four different temperatures: 25, 40, 50 and 60 °C, with moisture controlled and samples taken weekly for carbon (C) and volatile solids (VS) measurements. The duration of experiments was either 90 d (at 25 °C) or 60 d (at 40, 50 and 60 °C). Two different kinetic models were used to fit the carbon mineralisation curves: the 2C model, which considers two organic fractions (biodegradable and non-biodegradable) and the 3C model, which considers three fractions (easily biodegradable, slowly biodegradable and non-biodegradable). In both cases, the kinetic rate constants were calculated by mathematical fitting and were compared with previously reported values. The temperature influence on the rate constants was studied for both models using a T-dependent equation. The calculated kinetic rate constants were in agreement with previously published values, and good fitting of the experimental data was obtained with both models. Similar rate constant values were obtained for mineralisation of the biodegradable fraction (2C model) and the easily biodegradable fraction (3C model). The rate constants for the slowly biodegradable fraction (3C model) were much lower. A good correlation between rate constants and T was observed. Different optimum temperature values were obtained for each rate constant depending on which carbon fraction was degraded. The T-dependent rate constant values obtained could be used for modelling the C mineralisation of real variable-temperature composting processes.

Authors+Show Affiliations

Chemical Engineering Department, ITQUIMA, University of Castilla-La Mancha, Avenida Camilo José Cela, S/N 13071 Ciudad Real, Spain.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

21636212

Citation

Sánchez Arias, V, et al. "Kinetics of Forced Aerated Biodegradation of Digested Sewage Sludge-reed Mixtures at Different Temperatures." Journal of Environmental Management, vol. 95 Suppl, 2012, pp. S128-33.
Sánchez Arias V, Fernández FJ, Rodríguez L, et al. Kinetics of forced aerated biodegradation of digested sewage sludge-reed mixtures at different temperatures. J Environ Manage. 2012;95 Suppl:S128-33.
Sánchez Arias, V., Fernández, F. J., Rodríguez, L., Stentiford, E. I., & Villaseñor, J. (2012). Kinetics of forced aerated biodegradation of digested sewage sludge-reed mixtures at different temperatures. Journal of Environmental Management, 95 Suppl, S128-33. https://doi.org/10.1016/j.jenvman.2011.05.014
Sánchez Arias V, et al. Kinetics of Forced Aerated Biodegradation of Digested Sewage Sludge-reed Mixtures at Different Temperatures. J Environ Manage. 2012;95 Suppl:S128-33. PubMed PMID: 21636212.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetics of forced aerated biodegradation of digested sewage sludge-reed mixtures at different temperatures. AU - Sánchez Arias,V, AU - Fernández,F J, AU - Rodríguez,L, AU - Stentiford,E I, AU - Villaseñor,J, Y1 - 2011/06/01/ PY - 2009/08/30/received PY - 2011/05/04/revised PY - 2011/05/11/accepted PY - 2011/6/4/entrez PY - 2011/6/4/pubmed PY - 2012/8/21/medline SP - S128 EP - 33 JF - Journal of environmental management JO - J. Environ. Manage. VL - 95 Suppl N2 - This work presents a kinetic analysis of the aerobic biodegradation of anaerobically digested sewage sludge and dried reed mixtures at different temperatures. Batch experiments were conducted in laboratory-scale reactors with temperature (T) control and forced aeration of the solid mixture. The biowaste mixture was treated at four different temperatures: 25, 40, 50 and 60 °C, with moisture controlled and samples taken weekly for carbon (C) and volatile solids (VS) measurements. The duration of experiments was either 90 d (at 25 °C) or 60 d (at 40, 50 and 60 °C). Two different kinetic models were used to fit the carbon mineralisation curves: the 2C model, which considers two organic fractions (biodegradable and non-biodegradable) and the 3C model, which considers three fractions (easily biodegradable, slowly biodegradable and non-biodegradable). In both cases, the kinetic rate constants were calculated by mathematical fitting and were compared with previously reported values. The temperature influence on the rate constants was studied for both models using a T-dependent equation. The calculated kinetic rate constants were in agreement with previously published values, and good fitting of the experimental data was obtained with both models. Similar rate constant values were obtained for mineralisation of the biodegradable fraction (2C model) and the easily biodegradable fraction (3C model). The rate constants for the slowly biodegradable fraction (3C model) were much lower. A good correlation between rate constants and T was observed. Different optimum temperature values were obtained for each rate constant depending on which carbon fraction was degraded. The T-dependent rate constant values obtained could be used for modelling the C mineralisation of real variable-temperature composting processes. SN - 1095-8630 UR - https://www.unboundmedicine.com/medline/citation/21636212/Kinetics_of_forced_aerated_biodegradation_of_digested_sewage_sludge_reed_mixtures_at_different_temperatures_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0301-4797(11)00169-1 DB - PRIME DP - Unbound Medicine ER -