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Abstract

Conventional biological processes for treating wastewater include the so-called activated sludge process which is continuous and the sequencing batch reaction (SBR) activated sludge process. The first process requires the use of dedicated, relatively expensive external clarifiers, and the second process is inefficient in terms of treatment volume. A modified sequencing batch reactor process and system enable the efficient, continuous treatment and discharge of wastewater, combing the advantages of the SBR and activated sludge processes. In the present case, wastewater is initially fed in a first direction through a plurality of contiguous cells, the wastewater is subjected at all times to biological treatment in a plurality of such cells and settled in at least one of the cells immediately prior to discharge from the system. In subsequent steps, the wastewater is fed into the system at different locations for following a variety of biological treatment steps and paths through the cells, whereby selected aerobic treatment cells become settling cells and vice versa, so that wastewater is introduced and discharged from the system in a fixed rotating pattern. The activated sludge generally flows in the same direction as the wastewater but receives settling and separation from the wastewater immediately prior to discharge of treated wastewater from the system.

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