| abstract |
CO 2 is separated from waste gases by known technical methods and stored in underground cavities. By additions to the CO 2, according to the invention, of H 2 or NH 3 , methanogenic bacteria, bacteria substrate, catalysators and/or inhibitors the CO 2 is reduced during the underground storage to CH 4. The storage is possible in aquifer, natural gas reservoirs or oil and/or gas generating rock formations. Due to the equal volumes of CO 2 and CH 4 the process is a closed cycle and of constant pressure. Natural gas becomes a renewable energy. |