Journal of Fundamentals of Renewable Energy and Applications
Open Access

Bio-process optimization for biohydrogen and methane generation in an anaerobic co-digestion of kitchen waste with sewage treatment plant sludge

World Bioenergy Congress and Expo

June 13-14, 2016 Rome, Italy

Latha K, Sivanesan S, Velraj R and Shanmugam P

Anna University, India
CSIR-Central Leather Research Institute, India

Posters & Accepted Abstracts: J Fundam Renewable Energy Appl

Abstract :

The biomethanisation process alone for solid waste management becomes less energy efficient with high residual waste generation and less calorific value for methane (42 kJ/gm) than the Hydrogen (122 kJ/gm). Therefore, the anaerobic sequential production of hydrogen followed by methane maximizes the energy recovery with an intensive bioprocess optimization. One such approach of potential importance is the production of hydrogen and methane from sewage sludge co-digested with kitchen waste. This paper focuses on generation of hydrogen and methane through bio-process optimization using different pH, and oxidation reduction potential (ORP). The sewage sludge sample mixed with minced kitchen waste was optimized using different pH between 4.5 and 7.5. The optimized pH was further regulated with ORP between -100 mV to � 400 mV. The maxima hydrogen production was occurred at a pH of 5.5 and the ORP of -380 mV, whereas the methane maxima was noticed in the pH of 6.8 and the ORP of -210 mV. This was consistent with predominant rods shaped microorganisms in hydrogen maxima while the cocci shaped organisms at methane maxima correlated with the results reported elsewhere. The study demonstrated the specific hydrogen yield potential of 0.3 Nm.L/g of VS removed (VSr) and the specific methane yield potential of 0.6 Nm L/gm of VSr against the control specific hydrogen and methane yield potential of 0.05 Nm.L/gm VSr and 0.3 Nm.L/gm VSr. Hence, the study demonstrated that the minced kitchen waste co-digested with STP sludge becomes an energy efficient solid waste management option as a sequential production of hydrogen and methane using two stage hydrogeniser followed by methaniser ameliorating the existing two stage anaerobic hydrolyser followed by methaniser.

Biography :

Email: lathashan98@yahoo.com