A membrane bioreactor (MBR) WWTP combines conventional biological wastewater treatment with membrane technologies. Separation of activated sludge in conventional wastewater treatment plants takes place in settling tanks. This method of separation therefore has its limits in the quality of purified water and in a higher demand on the composition of activated sludge. Membrane separation consists of suppression or microfiltration, where the mixture of purified water and sludge is filtered through vacuum through membranes and the resulting effluent (permeate) is free of almost all undissolved substances and microbial contamination, so the permeate is hygienically secured.