Semi-continuous co-digestion of sludge, fallen leaves, and grass performance

Mahmoud Elsayed, Walid Blel, Mohamed Soliman, Yves Andres and Raouf Hassan

Energy, 2021, vol. 221, issue C

Abstract: The aim of this study is to improve the management of different types of wastes using an anaerobic digestion process and CH4 production from the semi-continuous co-digestion of multi-substrates of fallen leaves (FL), grass (GR) and primary sludge (PS). As a first step, the co-digestion of FL, GR and PS was carried out using the BMP test based on C/N ratios. The results showed that the best CH4 production was at a C/N ratio of 13. Kinetic analysis of the methane produced showed no adaptation phase was needed for the methanogenic bacteria to stimulate their anaerobic digestion activity. The inflection point in the cumulative methane production curve is identified as the biological hydrolysis phase of the substrates by endogenous microorganisms. In the second step, semi-continuous co-digestion of FL, GR and PS was carried out. The performance of the reactor was monitored in particular for biodegradability of the feedstock and biogas production rate under different OLRs. The highest biogas production rate of 35 L/d was recorded at an OLR of 1 g VS/L·d. However, partial overloading occurred at an OLR of 1.5 g VS/L·d. The highest CH4 content of biogas produced was achieved at an OLR of 1.0 g VS/L·d.

Keywords: Primary sludge; Fallen leaves; Grass; Semi-continuous co-digestion; Methane and biogas production; OLR (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544221001377
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:221:y:2021:i:c:s0360544221001377

DOI: 10.1016/j.energy.2021.119888

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().