Activated sludge process means that a reactor forms a biologically closed system which is continuously fed. If it is necessary to obtain the highest possible degradation rate but the plant nevertheless should be compact and economically efficient, the biomass concentration has to be increased in order to use volume and time in an optimal way and to reduce the retention time of the loaded waste water.
Since conventional technologies are no longer sufficient to increase the biomass concentration, ultrafiltration via T-CUT tubular modules is applied. In this way not only the volume of the biological stage decreases by increasing the biomass in the reactor, but also the total capacity of the plant is reduced. In addition, the membrane forms a safe barrier against viruses and bacteria and serves to improve the effluent quality.