Abstract
More and more effort is put into the utilization of bio-solids. That can be an important source for useful products such as fertilizers and biogas. DMT has been developing biogas treatment plants for over 20 years, closely following market developments.

Biogas was first seen as a nuisance at e.g. landfills, creating odour problems and methane emissions. Flaring has always been a cheap and simple solution. With time, more and more biogas was produced intentionally from bio-solids to generate energy. First in the form of heat and power, but now with the new renewable heat (energy) incentive, it is becoming increasingly attractive to upgrade biogas to natural gas quality and inject it into the natural gas grid. In this way, the gas can be utilized with the best energy efficiency.

There are several biogas upgrading technologies, ranging from old-fashioned water scrubbing to highly sophisticated cryogenic techniques. Each process has its advantages and disadvantages,  depending on the biogas origin, composition and plant location. However, with the latest developments in membrane separation, DMT has developed the Carborex^® MS system. This system, based on an ingenious, multi-stage, highly selective membrane system, is a perfect fit for almost all situations, especially for plants up to 750 Nm³/h.
 
In this article it is shown that the DMT Carborex^® MS is a compact modular unit built into a container. The biogas upgrading is performed with highly selective gas membranes. The upgraded gas with a methane concentration of 97-99% CH₄ can be used in the local gas grid, or can be further compressed to 220 bar and used as vehicle fuel (known as compressed biogas or CBG). The system has the highest energy recovery on the market (>98%) with only 0.15-0.20 kWh/Nm³ energy consumption and <0.5% methane loss. The CO₂ is recovered as >99,5% pure. After an optional liquefaction step, the CO₂ can be obtained as a liquid at food grade purity (>99.9998%). Moreover, due to the liquefaction step the methane loss will be reduced to virtually zero.

for more information contact Mister Robert Lems or Mister Coen Meijers
Tel. +31 513 636 789

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