Biogas develops in a completely natural process that takes place anywhere that organic waste is produced. During the process, the waste is broken down by microorganisms, resulting in a nutritious, energy rich end product. A valuable by-product Sludge from sewage treatment plants, food waste from households, institutional kitchens and restaurants and farm waste, to name but a few, all produce organic waste that has to be dealt with. Methane gas, or biogas as it is also known, is formed when the organic waste digests. At the end of the anaerobic digestion process, a nutritious rest product is left that can be recycled as agricultural fertilizer.   Methane is a greenhouse gas that is in fact more harmful than carbon dioxide. Carbon dioxide, however, counts for the greatest increase of the greenhouse effect since such large quantities are produced when fossil fuels are burned. Approximately 20 per cent of the increase is made up of methane. It is therefore important to recover energy rich biogas and nutritious biofertilizer through anaerobic digestion instead of using fresh manure and thereby missing out on the benefits of biogas.

Facts about biogas Biogas is extracted from sludge from sewage works, food waste from households, institutional kitchens and restaurants, food industry and farm waste etc.