Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Co-digestion of Extended Aeration Sewage Sludge With Whey, Grease and Septage: Experimental and Modelling Determination

Version 1 : Received: 23 July 2021 / Approved: 26 July 2021 / Online: 26 July 2021 (14:49:51 CEST)

A peer-reviewed article of this Preprint also exists.

Merlin, G.; Outin, J.; Boileau, H. Co-Digestion of Extended Aeration Sewage Sludge with Whey, Grease and Septage: Experimental and Modeling Determination. Sustainability 2021, 13, 9199. Merlin, G.; Outin, J.; Boileau, H. Co-Digestion of Extended Aeration Sewage Sludge with Whey, Grease and Septage: Experimental and Modeling Determination. Sustainability 2021, 13, 9199.

Journal reference: Sustainability 2021, 13, 9199
DOI: 10.3390/su13169199

Abstract

Potential of co-digestion mixing thickened secondary sludge (TS) from extended aeration wastewater treatment plant and locally available substrates (whey, grease and septage) has been studied using three steps. The first step was a batch test to determine biological methane potential (BMP) of different mixtures of the three co-substrates with TS. The second step has been carried out with lab-scale reactors (20 L) simulating anaerobic continuous stirred tank reactors fed by three mixtures of co-substrates determined according to previous step results. Modelling using ADM1 as a mechanistic model was applied in the third step to help understanding the co-digestion process. According to BMP step, septage used as co-substrate has a negative effect on performance and addition of 10 to 30% grease or 10% whey would lead to a higher production of biogas and with an increase of the methane content. The results from the reactor showed less evi-dence of the positive effects observed with the BMP assay. Protein and lipid fractions of particu-late biodegradable COD are important variables for digester stability and methane production as predicted by modelling. Results of simulations with ADM1 model adapted to co-digestion confirmed that this model is a powerful tool to optimize the process of biogas production.

Keywords

Anaerobic co-digestion; ADM1; BMP; biogas

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