Title: Effect of single and multi-additives on the performance of hydrogen fermentation from food waste

Authors: Chinmay Deheri; Saroj Kumar Acharya

Addresses: Department of Mechanical Engineering, ITER, SOA Deemed to be University, Odisha, 751030, India ' Department of Mechanical Engineering, ITER, SOA Deemed to be University, Odisha, 751030, India

Abstract: Hydrogen as an alternative energy source receives primary importance considering the greenhouse gas emission from conventional fossil fuels. In this study, calcium peroxide (CaO2), calcium carbonate (CaCO3), zinc oxide (ZnO), and copper oxide (CuO) were used as single additives, whereas CaO2+CaCO3, CaO2+CuO, CaO2+ZnO, CaCO3+ZnO, CaCO3+CuO, and CuO+ZnO were used as multi-additives to improve hydrogen fermentation using food waste and cow dung as substrate and sludge solution as inoculum. As a result, maximum hydrogen content was enhanced up to 33.85% with multi-additive (CaO2+CaCO3), whereas it was restricted to 26.34% using single additives. Compared to the control reactor, maximum hydrogen content was increased by 10 and 17% with single and multi-additives, respectively. Further, cumulative hydrogen yield was considerably enhanced from 114.1 to 146.62 mL g-1 TS by adding multi-additives, especially CaO2+CaCO3. Results demonstrated that multi-additives improved the system performance due to the enhanced process stability during fermentative hydrogen production.

Keywords: hydrogen production; additives; anaerobic fermentation; food waste; cow dung.

DOI: 10.1504/IJGW.2022.122433

International Journal of Global Warming, 2022 Vol.26 No.4, pp.405 - 416

Received: 21 Jul 2021
Accepted: 06 Sep 2021

Published online: 25 Apr 2022 *

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