Compact Units for Biological Treatment of Liquid Waste, type MBR and MBBR, for Advanced Treatment and Disinfection .MBR technology combines the process of biodegradation in an activated sludge reactor with the process of separating the effluent water from the mixed liquor (MLSS) through ultrafiltration membranes with a pore size of 0.04μm.These membranes completely retain the suspended solids of the activated sludge, and at the same time the treated effluent is freed from bacteria and viruses, eliminating the traditional method of disinfection with chlorine and chemicals. MBR systems present the following advantages: high effluent quality, elimination of the final sedimentation tank, low sludge production and small land area requirements.