Title: Enhancement of hydrogen production from Kitchen Waste using heat treated anaerobic biogas plant slurry with pH control

Authors: S. Jayalakshmi, V. Sukumaran, Kurian Joseph

Addresses: Lecturer in Institute of Remote Sensing, Department of Civil Engineering, Anna University, Chennai 600025, India. ' Department of Biotechnology, Periyar Maniammai University, Vallam, Thanjavur 613 403, Tamil Nadu, India. ' Centre for Environmental Studies, Anna University, Chennai 600 025, Tamil Nadu, India

Abstract: Hydrogen is found to be a clean energy source; biohydrogen has been researched in recent years. Anaerobic Digestion of Kitchen Waste (KW) for hydrogen production was performed in lab scale reactors, using heat-treated anaerobically digested biogas plant slurry. The biogas plant slurry was given heat treatment at varying temperatures ranging from 70 to 100 ° C for 15 min. Enhancement of hydrogen production using heat-treated anaerobic biogas plant slurry with pH control was also studied. To study the effect of pH in hydrogen production, the reactors were operated at varying pH ranging from 4.0 to 6.0. The reactor operated with 100 ° C Heat-Treated Inoculum (HTM) was efficient in hydrogen production from KW. The rate of hydrogen production was 176.2 mL kg−1 TS h−1. Methane was not reported in all the operated reactors except that the reactor operated with 70 ° C HTM. A significant difference was found in the production of hydrogen at different pH conditions and the pH 6 at mesophilic condition proved to be effective in enhancing the production of hydrogen. The rate of hydrogen production in the laboratory scale reactor operated with pH 6.0 was 211.20 ml kg−1 TS h−1. The hydrogen concentration was found to be 55-60% and the remaining was CO2. Normal butyrate was the main acid product, and the percentages of butyrate, acetate and propionate at tested conditions were 45-50, 20-25 and 20-25%, respectively.

Keywords: anaerobic digestion; heat-treated inoculum; hydrogen gas; kitchen waste; pH control; hydrogen production; biogas plant slurry; biohydrogen.

DOI: 10.1504/IJESD.2009.023710

International Journal of Environment and Sustainable Development, 2009 Vol.8 No.1, pp.23 - 35

Published online: 08 Mar 2009 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article