抄録
The one of the purpose of this paper is to make high concentration methane from digestive gas by separating carbon dioxide appropriately out of the digestive gas generated in sewage treatment equipment. We can dissolve gas efficiently into a solvent liquid by being filled with digestive gas in a tank, putting pressure, and passing solvent water in it. Digestive gas is gas which makes methane and carbon dioxide the main ingredients. The digestive gas used for this experiment was 58% of carbon dioxide and 42% of methane. As a result of dissolution / removal experiment, about 90 percent of carbon dioxide was able to reduce the content carbon dioxide in digestive gas in dissolution time about 3 minutes. Thereby, methane concentration became a maximum of 87% from 42%, and it was able to make high concentration methane from digestive gas. Another purpose is development of the technique which fixes this carbon dioxide by algae cultivation. We are cultivating seaweed in the sea water of 3% of carbon dioxide levels, and obtained the result which grows about 1.6 times compared with the case of control.
