In order to meet the growing demand for energy and to reduce the dependency on non-renewable energy sources, a renewable alternative energy source is needed. For decades, the development of renewable energy has been performed to meet a qualified source for alternative energy, including biomass, solar, geothermal, hydropower, sea and wind. One of promising form of renewable energy is biogas because it can be derived from evergreen feedstock that available widely. It even can use animal waste, agricultural waste, industrial waste, food waste as it raw materials, thus supporting clean and sustainable energy. Biogas is a form of gaseous bioenergy produced from the decomposition of organic matter or biomass by methanogenic bacteria in an anaerobic system. Research has been conducted to find the best raw materials as the source for biogas production. Here we will discuss type of natural feedstock that have been used as the raw materials for biogas production. Several type of raw materials including natural feedstock and waste were discussed to give a glimpse of sustainability in the generation of this biogas energy.
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