PTAR PLANT Upflow Anaerobic Reactor and Mud Blanket -UASB. Flow Division Unit. Submerged Aerated Filter – SAF. Secondary decanter – SD. Contact Tank – Disinfection. Chemical House. Activated Sludge. MBR / Membrane Bioreactor. Efficient way to reduce / eliminate environmental problems. Technologies that acting jointly and individually, applying biological and / or physico-chemical processing.