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Comparison of pre- and inter-stage aerobic treatment of wastewater sludge: effects on biogas production and COD removal

Abstract : The aim of this study was to investigate thermophilic (55 ° C) aerobic digestion (TAD) as pre- and inter-stage treatment of sludge anaerobic digestion and to analyse the change in organic matter accessibility and complexity. Pre-treatment decreased methane yield (up to -70%), due to oxidation losses whereas inter-stage treatment slightly improved overall methane yield (+2.6%) and total COD removal (+5%) compared to control. Anaerobic degradability and COD removal in the second anaerobic stage significantly increased, by 13 to 40%. Organic matter fractionation showed that TAD led to an increase in sludge organic matter accessibility in all cases. Organic matter complexity, measured by fluorimetry, increased after TAD pre-treatment whereas it remained constant after inter-stage treatment. TAD was shown to be more efficient if applied to a more recalcitrant substrate and should thus be used as inter-stage treatment to avoid decreasing methane production.
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Charlotte Rennuit, Jin Mi Triolo, Søren Eriksen, Julie Jimenez, Hélène Carrère, et al.. Comparison of pre- and inter-stage aerobic treatment of wastewater sludge: effects on biogas production and COD removal. Bioresource Technology, Elsevier, 2018, 247, pp.332-339. ⟨10.1016/j.biortech.2017.08.128⟩. ⟨hal-02620984⟩

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