Fairway Waste Management has incorporated a biological process to treat the organic fraction of waste that is separated at the households (at source). This process allows for the recovery of not only energy but also nutrients in the waste stream.
The decomposition of organic matter in the absence of oxygen is called anaerobic digestion. Anaerobic decomposition is a naturally occurring process that produces biogas-containing methane (natural gas) as a byproduct. In fact, anaerobic decomposition is an ongoing process deep in the Karadiyana landfill, which produces biogas. Biogas consists of methane, CO2 and water vapor. Methane is also known as natural gas that escapes in to the atmosphere where it acts as a potent greenhouse gas. However, if the process is controlled and the biogas is collected it can be combusted to produce electricity. Fairway Waste Management will install the largest and most advanced anaerobic digestion system in Karadiyana to treat as much as 40,000 tons of organic waste per year. It will produce approximately 11,000,000 kWh electricity per year. Additionally as a byproduct, the plant will produce 40,000 tons/year of liquid fertilizer and 7500 tons/year of solid fertilizer.
The plant will be built by Xergi of Denmark, which is currently the largest biogas producer in the world.