Format

Send to

Choose Destination
Waste Manag Res. 2014 Oct;32(10):947-53. doi: 10.1177/0734242X14550740. Epub 2014 Oct 3.

Effect of total solids content on methane and volatile fatty acid production in anaerobic digestion of food waste.

Author information

1
Department of Civil and Mechanical Engineering, University of Cassino and the Southern Lazio, Cassino, Italy flavia.liotta@unicas.it.
2
Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, Naples, Italy.
3
Department of Civil and Mechanical Engineering, University of Cassino and the Southern Lazio, Cassino, Italy.
4
Laboratoire Géomatériaux et Environnement, Université Paris-Est, Marne-la-Vallée, France.
5
UNESCO-IHE Institute for Water Education, Delft, The Netherlands.

Abstract

This work investigates the role of the moisture content on anaerobic digestion of food waste, as representative of rapidly biodegradable substrates, analysing the role of volatile fatty acid production on process kinetics. A range of total solids from 4.5% to 19.2% is considered in order to compare methane yields and kinetics of reactors operated under wet to dry conditions. The experimental results show a reduction of the specific final methane yield of 4.3% and 40.8% in semi-dry and dry conditions compared with wet conditions. A decreasing trend of the specific initial methane production rate is observed when increasing the total solids concentration. Because of lack of water, volatile fatty acids accumulation occurs during the first step of the process at semi-dry and dry conditions, which is considered to be responsible for the reduction of process kinetic rates. The total volatile fatty acids concentration and speciation are proposed as indicators of process development at different total solids content.

KEYWORDS:

Anaerobic digestion; dry digestion; food waste; moisture content; volatile fatty acids

PMID:
25281663
DOI:
10.1177/0734242X14550740
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Atypon
Loading ...
Support Center