Aerobic Biological Wastewater Treatment In A Continuous Flow Reactor

Abstract: The invention pertains to a method for the purification of substrate-containing wastewater in a continuous flow-through aerobic biologically activated sludge reactor B, wherein at least part of biological sludge (6) is conditioned in a selector S under anaerobic or anoxic conditions with at least part of the substrate-containing, to-be-purified wastewater (2), optionally after a pre-treatment step VB of the supplied wastewater (1), wherein conditioning comprises first accumulating sludge particles which have a settling velocity of at least 2 m/h, and then bringing substrate-containing wastewater into contact with the accumulated sludge particles for a contact time of at least 10 minutes in the selector S, and wherein the selector S is operated or designed such that during contacting the sludge with substrate-containing wastewater the sludge residence time in the selector S is greater than the hydraulic residence time of the sludge/water mixture (3) in the selector, and wherein the sludge/water mixture (3), optionally after an additional anaerobic or anoxic contact step, is fed to the aerobic purification reactor B and subjected to aerobic treatment B, wherein the treated wastewater (4) after aerobic treatment is optionally separated from the sludge by settling in a secondary settling tank NB, flotation or mechanical separation, and wherein the selector receives (at least a portion of) the sludge (6) separated from the aerobically treated wastewater and/or sludge (6') from the aerobic purification reactor B.

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