消化ガス利用による炭素回生システムの開発

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 in the real plant. As the new removal technique of the carbon dioxide in digestive gas, we used the small size gas 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. Also available with the use of the ejector system, even if the pressure of the feed gas is low. Digestive gas is gas which makes methane and carbon dioxide the main ingredients. The digestive gas used for this experiment ware 30% of carbon dioxide and 70% of methane at pattern of the experimental condition 1 and 40% of carbon dioxide and 60% of methane at pattern of the experimental condition 2. As a result of dissolution / removal experiment, about 90 percent of carbon dioxide was able to reduce the content carbon dioxide in digestive gas. Thereby, methane concentration became to about 90%, and it was able to make high concentration methane from digestive gas.