Abstract
A research team from the Gas Research Institute of Chicago have studied a method for producing cleaner and more concentrated methane gas from municipal wastes. To bring methane gas to pipeline quality can account for almost half the total cost of producing fuel from municipal wastes, so the cost benefits of the process were also considered. The process involves the almost total removal of CO/sub 2/ in a two stage, pH owing, pressure swing digestive system. Initially there is acetogenic fermentation of the waste in a leached bed reactor and the liquid phase is sparged with air. The almost CO/sub 2/-free solution then reaches an alkaline, pressurised packed bed reactor for anaerobic digestion. Because of the process's temperature (35 degrees C) and pressure (30 psig) the CO/sub 2/ is very soluble and this results in 90-95% pure compressed methane gas being produced. This was a preliminary design assessment and more research is needed.
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