Anaerobic digestion (AD) plants degrade organic material using micro-organisms in the absence of oxygen to produce biogas, a mixture of methane (circa 60%), carbon dioxide (circa 40%) and trace amounts of other gases.
Apart from the capital cost of building a plant, biogas produced by AD has several potential advantages over landfill gas as follows:
- AD gas is less complex and has a higher methane content at ~60% (~50% for landfill gas).
- Front-end revenue can be generated through ‘gate fees’ for receiving waste.
- The process allows operations to be strategically located close to the origin of waste arising and demand for product.