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Improving methane production during the codigestion of waste-activated sludge and fatty wastewater: Impact of thermo-alkaline pretreatment on batch and semi-continuous processes

Abstract : With the objective of maximising methane production from waste-activated sludge (WAS), codigestion with fatty wastewater (FW) collected from restaurants was studied and the application of both a 170 degrees C thermal pretreatment and thermo-alkaline/saponification to mixed WAS/FW waste was evaluated. Batch anaerobic digestion tests showed that recalcitrant compounds were formed during the 170 degrees C pretreatment of fatty wastewater and thermo-alkaline pretreatments (80 degrees C or 120 degrees C, pH 8, 9 or 10) led to an increased initial methane production rate and to a very slight impact on the methane potential of the mixed waste (+4-7%). Semi-continuous anaerobic digesters were fed over 4 months with WAS, two mixed substrates WAS/FW 90/10 and WAS/FW 60/40, and with WAS/FW 90/10 pretreated at softer conditions (80 degrees C and pH = 8, 0.14 g(KOH) g(VS)(-1)). This pretreatment led to a significant increase in the methane production of semi-continuous reactors (+58%). Finally, this study showed the feasibility of the codigestion of waste activated sludge with highly concentrated fatty wastewater (40% in volume, 49% in VS and 73% in COD, equivalent to 7 g L-1 of lipids). It resulted in specific methane production of 362 mL CH4 g(-1) VS whereas WAS alone produced only 116 mL CH4 g(-1) VS.
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https://hal.inrae.fr/hal-02650543
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Submitted on : Friday, May 29, 2020 - 2:15:47 PM
Last modification on : Wednesday, March 23, 2022 - 12:08:19 PM

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Hélène Carrère, Yan Rafrafi, Audrey Battimelli, Michel Torrijos, Jean-Philippe Delgenès, et al.. Improving methane production during the codigestion of waste-activated sludge and fatty wastewater: Impact of thermo-alkaline pretreatment on batch and semi-continuous processes. Chemical Engineering Journal, Elsevier, 2012, 210, pp.404 - 409. ⟨10.1016/j.cej.2012.09.005⟩. ⟨hal-02650543⟩

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