Abstract
Biogas is one of the most promising energy sources for the future. Biogas is a “waste” product from e.g. landfill sites or digesters that can be applied as a green and renewable energy source with no global emissions on CO₂ and hardly no local emissions on other pollutants.

Currently most biogas is used at a CHP at which a large part of the energy is converted into heat which can not or only partly be used. This could result in an energy loss up to 60%. But biogas can also be upgraded to natural gas quality. As upgraded biogas, the gas can be used as vehicle fuel, injected into the gas grid or transported to more efficient energy production sites by which the total energy recovery can be close to 100%.

Most important for biogas upgrading to natural gas quality is the removal of CO₂ and H₂S. A second important issue is the energy efficiency and methane losses. In this paper the advantages of pressurized water scrubbing compared to other available technologies are stressed out. In more detail innovations of the DMT Carborex^® PWS technology are explained. The possibilities for recovery of liquefied CO2 and the integration of heat-pump technology makes it the ultimate process for biogas upgrading. The result is an energy neutral plant without methane losses and even a reduction on global CO₂ emissions (instead of being neutral). DMT will demonstrate the pressurized water scrubbing system in relation with the other upgrading processes by field experiences.

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