Patent ID: 6540924
Filing Date: 2003-04-01
Classification: B01F,C02F,Y02W

Abstract:
A method to treat liquids such as municipal wastewater industrial process liquids etc, where air or another gas is added, characterized in,that liquid is transported from the lower area of a tank through a pipe that reaches up above the water surface, the pipe having a length and a design above the surface such that a loss eliminated flow is obtained and which is directed from an upward flow into a downward vertical flow, that the static under pressure prevailing in parts of the pipe above the water surface is utilized for adding of a suitable amount of air or another gas, that the pipe after the bend above the water surface transports the gas-water mixture essentially vertically downwards, that the gas-water mixture is linked upwards at a suitable location, preferably in level with the bottom of the tank, into an upward vertical flow, that the upwardly directed flow occurs within a pipe having its end close to the water surface.