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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
environmental science
Improvement of fruit and vegetable waste anaerobic digestion performance and stability with co-substrates addition
Journal of Environmental Management, Volume 90, No. 5, Year 2009
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Description
The effect of fish waste (FW), abattoir wastewater (AW) and waste activated sludge (WAS) addition as co-substrates on the fruit and vegetable waste (FVW) anaerobic digestion performance was investigated under mesophilic conditions using four anaerobic sequencing batch reactors (ASBR) with the aim of finding the better co-substrate for the enhanced performance of co-digestion. The reactors were operated at an organic loading rate of 2.46-2.51 g volatile solids (VS) l-1 d-1, of which approximately 90% were from FVW, and a hydraulic retention time of 10 days. It was observed that AW and WAS additions with a ratio of 10% VS enhanced biogas yield by 51.5% and 43.8% and total volatile solids removal by 10% and 11.7%, respectively. However FW addition led to improvement of the process stability, as indicated by the low VFAs/Alkalinity ratio of 0.28, and permitted anaerobic digestion of FVW without chemical alkali addition. Despite a considerable decrease in the C/N ratio from 34.2 to 27.6, the addition of FW slightly improved the gas production yield (8.1%) compared to anaerobic digestion of FVW alone. A C/N ratio between 22 and 25 seemed to be better for anaerobic co-digestion of FVW with its co-substrates. The most significant factor for enhanced FVW digestion performance was the improved organic nitrogen content provided by the additional wastes. Consequently, the occurrence of an imbalance between the different groups of anaerobic bacteria which may take place in unstable anaerobic digestion of FVW could be prevented. © 2008 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Bouallagui, Hassib
Tunisia, Tunis
University of Carthage, Institut National Des Sciences Appliquées et de Technologie
Lahdheb, H.
Tunisia, Tunis
University of Carthage, Institut National Des Sciences Appliquées et de Technologie
Ben Romdan, E.
Tunisia, Tunis
University of Carthage, Institut National Des Sciences Appliquées et de Technologie
Rachdi, B.
Tunisia, Tunis
University of Carthage, Institut National Des Sciences Appliquées et de Technologie
Hamdi, Moktar
Tunisia, Tunis
University of Carthage, Institut National Des Sciences Appliquées et de Technologie
Statistics
Citations: 319
Authors: 5
Affiliations: 1
Identifiers
Doi:
10.1016/j.jenvman.2008.12.002
ISSN:
03014797
Research Areas
Environmental