Wet air oxidation (WAO) is the process of oxidizing organic matter in the presence of liquid water. Theoretically, any substance that is capable of burning can be wet oxidized in water. WAO is typically employed as a waste treatment technology when the waste is non-conducive to incineration or biological treatment. It is an ideal process for pretreatment of wastes that are problematic to conventional biological facilities. The WAO process is uniquely suited to the oxidation of concentrated waste liquors, slurries, and sludge’s where the oxygen demanding organic matter is only a few percent of the predominantly water stream9.