Abstract
Abstract
This study investigated the process performance in the combined anaerobic–anoxic–aerobic biotreatment, accomplished by membrane biological reactors (MBR). The pilot system produced high-effluent quality, free of particles and without contribution of phosphorus and nitrogen from suspended solids. Intensive utilization of the organic matter in the anaerobic reactor enabled a significant reduction of the organic load on the aerobic reactor, therefore, complete nitrification was achieved. High mixed liquor suspended solids (MLSS) concentration in the anoxic reactor created fast oxygen demand and prevented potential damage from high-dissolved organic levels in the aerobic-to-anaerobic recycled stream. Effective denitrification in the anoxic reactor enabled complete anaerobic conditions, without residual nitrates or dissolved oxygen, and created a favorable environment for phosphate accumulating organisms (PAOs) in the anaerobic reactor.
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