Biochemical Methane Potential Assay Using Single Versus Dual Sludge Inocula and Gap in Energy Recovery from Napier Grass
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Biochemical Methane Potential Assay Using Single Versus Dual Sludge Inocula and Gap in Energy Recovery from Napier Grass Digestion Amornpan Thaemngoen 1 & Chettaphong Phuttaro 1 & Kanyarat Saritpongteeraka 1,2 & Shao-Yuan Leu 3 & Sumate Chaiprapat 1,4
# Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Potential energy recovery from Napier grass biomass was evaluated in batch mode and later compared with different digestion techniques, i.e., theoretical calculation and anaerobic digester operations. In the first part, different anaerobic digester sludges from pig farm, palm oil mill, and concentrated rubber latex factory, designated as PIG, PALM, and RUB in order, were evaluated for their ability as inoculant for biochemical methane potential (BMP) study. Using the first-order and Gompertz models, PIG and RUB were found to possess highest hydrolysis and methanogenesis activities, respectively. Prior to full BMP test on real biomass, suitable inoculum to substrate ratio (ISR) was identified, where ISR ≥1 g VSinoculum per g VSsubstrate was found statistically equivalent for the Napier grass substrate. Results from a series of BMP assays revealed a far more superior digestibility performance of the dual sludge inoculum over the individual PIG and RUB at 32% and 49%, respectively. The protocol proposed in this study could be used as an evaluation and selection guideline for BMP inoculum. In the second part, these BMP results were compared and contrasted with the theoretical methane potential and methane yields from wet and dry Napier grass digester operations in reference to the recoverable energy of this biomass. Gap between different methods suggests rooms for improvement and utilization of the residue. Keywords Dual sludge . Inoculum . Anaerobic digestion . Anaerobic activity . Lignocellulosic biomass . Methane potential
Introduction The projected expansion of the world’s population and the increase in energy consumption patterns have presented a great challenge for future energy supply [1]. Renewable energy offers a possible way to reduce the stress on energy security by utilizing the available resources in the area. Energy production from organic materials is highly cost-effective, * Sumate Chaiprapat [email protected] 1
Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand
2
Center of Excellence on Energy Technology and Environment, Postgraduate Education and Research Development Office (PERDO), Bangkok 10400, Thailand
3
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
4
PSU Energy Systems Research Institute, Prince of Songkla University, Hat Yai 90110, Songkhla, Thailand
especially for tropical countries where bioresources are abundant all year round. Anaerobic digestion (AD) is a biological process in which organic matters are decomposed under oxygen void conditions, consisting of 4 steps, hydrolysis, acidogenesis, acetogenesis, and methanogenesis.
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