When gas escapes from industrial equipment or other processes where it is intended to be contained, due to leaks or the existence of other unforeseen or unexpected escape routes, the resulting emissions are called fugitive. It is well known that these emissions are a problem in the oil and gas industry, for example from sources such as oil wells and gas plants, but less well known are the fugitive emissions from agriculture, particularly livestock farms where the animal waste has to be moved around, stored and is spread on the land as manure.

Storing animal waste as a solid-liquid mixture known as manure slurry in open pits, often called slurry lagoons, results in fugitive emissions escaping from the slurry surface to the surrounding air. Fugitive emissions from slurry lagoons are mainly of methane, a greenhouse gas that contributes significantly to climate change (methane is more than 80 times more damaging as a greenhouse gas than CO₂).

Bennamann captures these fugitive emissions and turns the methane into useful, sustainable, renewable energy products – compressed fugitive methane, or CFM, and liquid fugitive methane, LFM – this biomethane can replace traditional fossil fuels such as petrol, diesel, heating oil, propane gas and liquid natural gas, also known as LNG.