Economic Analysis of Swine Farm Management for the Enhancement of Biogas Production and Energy Efficiency
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ORIGINAL PAPER
Economic Analysis of Swine Farm Management for the Enhancement of Biogas Production and Energy Efficiency N. Putmai1 · T. Jarunglumlert2 · C. Prommuak3 · P. Pavasant4 · A. E. Flood1 Received: 8 October 2019 / Accepted: 23 February 2020 © Springer Nature B.V. 2020
Abstract The conventional all-in/all-out batch management that is applied in most small to medium swine farms often provides an inconsistent feed of wastewater to biogas systems, causing an imbalance between the power requirements and generation capacity of a farm. This study proposes two alternative models that can be employed to ease this problem. In Model 1, the operation was divided into two offset batch intervals, while in Model 2, the operation used four separate offset batch intervals. The models developed here help avoid an unnecessary long lag phase in the digester, allowing more stable anaerobic digestion performance and more evenly distributed biogas production. Accordingly, the models produce a more stable supply of energy for domestic use, achieving a 36–44% reduction in the electricity expense or a savings of 43,782 m3 biogas/year or 35,834 kWh equivalent compared with that of conventional management. Conventional farm management has periods of excess and deficient biogas production; excess biogas is produced at a rate of up to 14,714 m3/year or 12,043 kWh equivalent at the peak period. This excess could be reduced by 79–100% by using the proposed farming models. This reduction is equivalent to greenhouse gas reductions of 9441 and 11,902 m3 CO2 eq./year by Models 1 and 2, respectively. Finally, a sensitivity analysis is used to show how the profitability of biogas plants would vary due to changes in some key parameters, such as the electricity buyback price. The results suggest that more profit could be attained from a significant reduction in operating costs by proper farm management without requiring additional investment.
Electronic supplementary material The online version of this article (doi:https://doi.org/10.1007/s12649-020-00989-4) contains supplementary material, which is available to authorized users. * A. E. Flood [email protected] 1
School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong, Thailand
2
Faculty of Science, Energy and Environment, King Mongkut’s University of Technology North Bangkok (Rayong Campus), Rayong, Thailand
3
Energy Research Institute, Chulalongkorn University, Bangkok, Thailand
4
Tree Moments Co., Ltd, Bangkok, Thailand
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Waste and Biomass Valorization
Graphic Abstract
Keywords Swine farming · Wastewater · Biogas · Renewable energy
Statement of Novelty Small- to medium-scale swine farms are economically important in many developing countries. This study develops improved farm management models to enhance the efficiency of biogas production and improve the economics of operation of these farms. The currently used model raises swine in single batches and is inefficient for continuous prod
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