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Biogas Generation in a Vegetable Waste Anaerobic Digester: An Analytical Approach

Author Affiliations

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

Res. J. Recent Sci., Volume 1, Issue (3), Pages 41-47, March,2 (2012)

Abstract

Mixture of vegetable wastes was an-aerobically digested in a 500 ml capacity lab scale batch reactors. Vegetable wastes having near similar pH and moisture content have been chosen so that overall pH and total solids content do not vary significantly in the feed composition for the study. Carrot, beans and brinjal having pH 5.4, 5.8 and 5.7 and moisture content 89.8%, 90.29% and 89.4% respectively were chosen for the study. These wastes contain predominantly carbohydrates and less protein and fat. Studies were carried out by preparing the feed consisting of carrot, beans and brinjal in different proportions to obtain organic load ranging from 0.06gm VS to 0.47 gm VS. The performance of the reactors was evaluated by estimating destruction of total and volatile Solids and by monitoring daily gas production. Mean methane production rate were determined at different organic loading range. Predictive models for analyzing the performance of the batch reactor and for determining cumulative biogas production for a given organic loading have been developed. The kinetics of the process has been studied using first order rate equation and reported in the paper.

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