Pilot-Scale Anaerobic Co-Digestion of Wastewater Sludge with Lignocellulosic Waste: A Study of Performance and Limits

Amar Naji, Sabrina Guérin Rechdaoui, Elise Jabagi, Carlyne Lacroix, Sam Azimi and Vincent Rocher ()
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Amar Naji: Direction d’Innovation, Service Public de L’assainissement Francilien (SIAAP), 82 Avenue Kléber, 92700 Colombes, France
Sabrina Guérin Rechdaoui: Direction d’Innovation, Service Public de L’assainissement Francilien (SIAAP), 82 Avenue Kléber, 92700 Colombes, France
Elise Jabagi: Direction d’Innovation, Service Public de L’assainissement Francilien (SIAAP), 82 Avenue Kléber, 92700 Colombes, France
Carlyne Lacroix: Direction d’Innovation, Service Public de L’assainissement Francilien (SIAAP), 82 Avenue Kléber, 92700 Colombes, France
Sam Azimi: Direction d’Innovation, Service Public de L’assainissement Francilien (SIAAP), 82 Avenue Kléber, 92700 Colombes, France
Vincent Rocher: Direction d’Innovation, Service Public de L’assainissement Francilien (SIAAP), 82 Avenue Kléber, 92700 Colombes, France

Energies, 2023, vol. 16, issue 18, 1-13

Abstract: The effects of co-digesting sewage sludge (SS) and horse waste (HW), the composition of HW, and the ratio of HW:SS were studied using two semi-continuous digesters of 9.5 L of working volume. These digesters were operated in parallel with the mono-digestion of SS in digester 1 (D1) and the co-digestion of SS and HW in digester 2 (D2). In digester 2, there were two phases of digestion (durations of 40 and 43 weeks, respectively). The composition of HW in the first phase was 85% wheat straw (WS), 14% wood chips (WC), and 1% horse manure (HM), with 99% wheat straw (WS) and 1% horse manure (HM) in the second phase. Variable ratios of HW:SS were studied in the digesters. The co-digestion of sewage sludge (SS) and horse waste (HW) produced more biogas than the mono-digestion of SS alone, with a maximum of 15.8 L·d −1 , compared to 9 L·d −1 at the end of the experiment. When comparing the results obtained in both phases, the production of methane in phase 2 was 18 NmL·g VS −1 higher than in phase 1. This slight increase in methane yield could be linked to the absence of wood chips (WC), which is considered to have a diluting effect on methane production. Therefore, this study shows that an organic loading rate (OLR) of 4.8 kg VS ·m −3 ·d −1 , a ratio of HW:SS of 3, and a composition of HW (99% WS, 1% HM) should be respected in the actual experimental conditions for a well-functioning anaerobic digestion.

Keywords: liquid state anaerobic digestion; co-digestion; horse bedding; horse waste; sewage sludge; lignocellulosic biomass (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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