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Issue 7, 2020
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Modelling of the anaerobic semi-continuous co-digestion of sewage sludge and wine distillery wastewater

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Abstract

The semi-continuous mesophilic anaerobic co-digestion of sewage sludge and wine distillery wastewater was investigated. In this sense, the effects of reducing the 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−1 d−1) was also enhanced (30% higher) compared to that 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−1) was higher than SS (0.094 kgCH4 kgCOD−1), which means that co-digestion increased the rate of consumption because of the higher amount of biodegradable compounds. The kinetic study showed that anaerobic co-digestion favoured the methane production rate enhancing the acetate consumption step and making methanogenesis the rate-limiting step in this process.

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

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Article information


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

Environ. Sci.: Water Res. Technol., 2020,6, 1880-1889
Article type
Paper

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

V. Ripoll, C. Agabo-García, R. Solera and M. Perez, Environ. Sci.: Water Res. Technol., 2020, 6, 1880
DOI: 10.1039/D0EW00275E

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