Glycerol is a by-product in the making of biodiesel. Although some of the glycerol can be used as raw material in some industries, not all of it can be utilized. A "glycerol-glut" (or "glycerine-glut") is expected when biodiesel operations become commonplace in many countries. Strategies are underway to find other value-added uses of glycerol, in anticipation of this "glycerol-glut". Researchers from the University of Manitoba (Canada) found that glycerol supplementation improves the anaerobic digestion of swine manure. Anaerobic digestion is a biological treatment process where organic matter is degraded by microorganisms (in the absence of air). The process produces another type of gaseous biofuel called, "biogas" (a 55/45 to 60/40 volume mixture of methane and carbon dioxide, under good operating conditions). University of Manitoba graduate student, Oswald Wohlgemut found that an optimum proportion of glycerol (about 1%) doubled the biogas production in swine-manure anaerobic digesters. Glycerol additions greater than 1%, however, caused digester failure. A large-scale pilot project is reportedly being developed at the University of Manitoba's research farm, at Glenlea, "to assess the anaerobic digestion of manure co-mixed with various other waste materials to enhance gas production"..