After having undergone a normal separation treatment of coarse solids with specific techniques for each type of wastewater (e.g. decanting, gridding, filtration, flotation), a correct volume of water is dosed into the tank.
The cell partially rotates into the water in order to allow the contact between bacteria and wastewater and partially in the air, favoring the natural aeration (without the use of air compressors) of the bacteria population.
A bacterial film layer, related to type of wastewater, is formed and it purifies the dissolved pollutants.
The purified water is separated from the process sludges by means of standard methods (e.g. decantation, filtration).