The world economy is threatened by rising oil prices due to the depletion of resources, and climatic changes are intensified due to rapid increase of greenhouse gases emission. Global warming is recognized as a worldwide problem not only as national level one, collaborative efforts are in progress actively. The fact is that the development of new & renewable energy which can replace fossil fuel and preserve the environment is the key of the attention in accordance with "low carbon, green growth" policy of our government. Biogas is an energy source. And the best part of using biogas is that wastes are treated in its production process.