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Modelling of the anaerobic semi-continuous co-digestion of sewage sludge and wine distillery wastewater

Abstract

The semi-continuous mesophilic anaerobic co-digestion of sewage sludge and wine distillery wastewater was investigated. In this sense, the effects of reducing hydraulic retention time (HRT, from 20 d to 8 d) on the degradation of organic matter and methane production were determined. The experimental results showed that anaerobic co-digestion enhanced the biodegradability of the mixture in terms of VS and CODt (7-8% higher) for HRT = 8 d. The methane productivity at HRT = 8 d (18.0 LCH4/kgVS·d), was also enhanced (30% higher) than those obtained in the control experiment. In addition, a mathematical kinetic model was proposed to determine the rate-limiting step of the process. Stoichiometric parameters obtained for SS:WDW (0.115 kgCH4/kgCOD) was higher than SS (0.094 kgCH4/kgCOD), which means that co-digestion increased the rate of consumption because more amount of biodegradable compounds. Kinetic study showed that anaerobic co-digestion favoured methane production rate enhancing the acetate consumption step and making methanogenesis the rate-limiting step in this process.

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Article information


Submitted
25 Mar 2020
Accepted
20 May 2020
First published
20 May 2020

Environ. Sci.: Water Res. Technol., 2020, Accepted Manuscript
Article type
Paper

Modelling of the anaerobic semi-continuous co-digestion of sewage sludge and wine distillery wastewater

V. RIPOLL, C. AGABO, R. Solera and M. PEREZ, Environ. Sci.: Water Res. Technol., 2020, Accepted Manuscript , DOI: 10.1039/D0EW00275E

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