Improvement of fruit and vegetable waste anaerobic digestion performance and stability with co-substrates addition

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...

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Bibliographic Details
Published in:	Journal of environmental management Vol. 90; no. 5; pp. 1844 - 1849
Main Authors:	Bouallagui, H., Lahdheb, H., Ben Romdan, E., Rachdi, B., Hamdi, M.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-04-2009 Elsevier Academic Press Ltd
Subjects:	Abattoir wastewater Abattoirs Alkalinity Anaerobic co-digestion Analysis of Variance Animal, plant and microbial ecology Animals Applied ecology Applied sciences Bacteria, Anaerobic - metabolism Biodegradation, Environmental Biological and medical sciences Carbon - metabolism Conservation, protection and management of environment and wildlife Exact sciences and technology Fish waste Fishes - metabolism Fruit - metabolism Fruit and vegetable waste Fundamental and applied biological sciences. Psychology General aspects Nitrogen Nitrogen - metabolism Pollution Refuse Disposal - methods Sequencing batch reactor Sewage - chemistry Sewage - microbiology Sludge Stability Vegetables - metabolism Waste activated sludge Wastewaters Water treatment Water treatment and pollution Anaerobic co-digestion Abattoir wastewater Waste activated sludge Stability Sequencing batch reactor Fish waste Fruit and vegetable waste Activated sludge Vegetables Environmental management Anaerobic digestion Waste water Substrate Vertebrata Pisces Wastes Performance Sequencing
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0301-4797 1095-8630
DOI:	10.1016/j.jenvman.2008.12.002