Korea Advanced Institute of Science and Technology (KAIST), Korea
Keywords: Renewable energy, bio-gas plant, methane, food waste, decentralized plantBio-renewable energy is an attractive resolution to climate change and energy crisis. Among various bio-renewable energy sources, food wastes have been a major source of energy generation because energy production from the food wastes can offset the enormous treatment costs of the food wastes. Hence, many bio-energy plants have been constructed, and centralized plants have been preferred because of its economic efficiency and ease of management. However, despite such benefits, the centralized plants pose several substantial issues such as high initial investment costs, transportation problems, and low applicability to communities with low waste productions. Building several decentralized on-site plants instead of a single centralized plant can be a countermeasure to those issues. Decentralized system generally has low initial investments, low transportation costs, and high applicability to low population areas. In this study, an on-site biogas plant capable of daily treating 60kg of food wastes is installed at the basement of an apartment with 30 households and has been operated and maintained for 3 years. During the period of operation, the average methane yield is 63%. Specific analysis about methane yield and electricity generation is described in the result section with the effect of greenhouse gas reduction from the biogas production.