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Studies on Conversion of Carbohydrate content in the Mixture of Vegetable Wastes into Biogas in a Single Stage Anaerobic Reactor

Author Affiliations

  • 1Department of Chemistry, GKM College of Engineering and Technology Chennai–63, Tamil Nadu, INDIA
  • 2 Environment Technology Division, (CLRI), Council of Scientific and Industrial Research (CSIR), Adyar, Chennai, INDIA

Res.J.chem.sci., Volume 2, Issue (6), Pages 66-71, June,18 (2012)


In the present study mixture of vegetable wastes were an-aerobically digested in a single stage mesophilic reactor. Vegetable wastes having near similar pH and moisture content have been chosen (carrot, beans and brinjal having pH 5.4, 5.8 and 5.7 respectively and moisture content 89.8%, 90.29% and 89.4% respectively) so that total solids content do not vary significantly in the feed composition for the study. These wastes contain predominantly carbohydrates and less protein and fat. The reactors were operated at two different organic loading rates (OLR) 0.25 and 0.5gVS/l.d, with the Hydraulic Retention Time (HRT) of 25days. The performance of the reactors was evaluated by estimating destruction of total and volatile Solids and by monitoring daily gas production. Volatile fatty acid (VFA) profile was determined for each organic load during the operation. The biogas yield was, 0.383 and 0.522 l/gTSadded and 0.423 and 0.576 l/gVSadded for the two OLR respectively. The methane content in the gas was around 63% and methane yield was 0.226 and 0.362 l CH / gVSadded for the selected vegetables for the two OLR respectively. The objective of this paper was to study the effective conversion of carbohydrate content in the selected mixture of vegetable wastes in a single stage anaerobic reactor for biogas production.


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