Abstract
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. As the new removal technique of the carbon dioxide in digestive gas, we proposed using "Non-air-bubbles dissolution equipment." It 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. Generally, the ratio of methane to carbon dioxide is about 6:4, and contains a lot of carbon dioxide. 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.
