Patent ID: 8298426

Claim:
A method of treating a liquid by counter current supersaturation oxygenation, comprising the steps of: providing a down flow tube having a top and a bottom; providing an upflow tube extending through a sidewall of said down flow tube, an entrance to said upflow tube is disposed at substantially said bottom of said down flow tube, a cross section of said down flow tube is greater than a cross section of said upflow tube; providing a supply of gas having an oxygen content of at least 30% by weight; and providing a gas diffuser having a plurality of openings for emitting said supply of gas, said gas diffuser is retained inside said down flow tube; and flowing a stream of liquid down said down flow tube at substantially said top thereof, said stream of liquid flowing up said upflow tube, said stream of liquid flowing down said down flow tube at a rate such that said supply of gas flows up through an entire length of said stream of liquid to said top of said down flow tube.