Landfill gas and biogas are generated during the anaerobic decomposition of organic matter, typically consisting of 60% methane and 40% carbon dioxide. Contaminant constituents often include sulfur dioxide, siloxanes and water vapor.

Historically these gases have been treated as waste by-products, being either flared or exhausted into the atmosphere. Spurred by rising energy prices and incentives to reduce greenhouse gas emissions, all forms of biogenic methane are being increasingly viewed as valuable resources. Typical applications for these gases include fueling industrial boilers, generator sets and microturbines. In some cases, landfill gas and biogas are purified to natural gas standards for injection into the existing gas transmission infrastructure.

Whatever the final use, dehydration is a vital precursor. Reducing the water vapor content of the gas minimizes damage to gas processing systems, mitigates other contaminants, such as siloxanes, and raises the BTU value.

Van Air refrigerated gas dryers are a dependable and proven technology for removing entrained water.