Liquid purification or separation – Processes – Treatment by living organism
Patent
1991-02-15
1993-07-20
Wyse, Thomas
Liquid purification or separation
Processes
Treatment by living organism
210607, 210621, 210624, 210629, 210630, C02F 330
Patent
active
052289966
ABSTRACT:
Conventional biological processes for treating wastewater include the so-called activated sludge process which is continuous and the sequencing batch reactor (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 of wastewater, combining the advantages of the SBR and activated sludge processes. Wastewater is treated in three contiguous treatment sections, each of which includes a plurality of contiguous cells. In a first series of operations, the flow direction is from the first to the third sections, and in a second series of operations the flow is reversed. In each series of operations, the first step is to aerobically treat the wastewater, and then allow the sludge to settle before discharging the treated wastewater from the system. The settling steps of the process include pre-settling while wastewater is flowing through a section, and quiescent settling while aerobic treatment and flowing or pre-settling are occurring in other sections of the system.
REFERENCES:
patent: 4488967 (1984-12-01), Block et al.
patent: 4663044 (1987-05-01), Goronszy
patent: 4948510 (1990-08-01), Todd et al.
patent: 4975197 (1990-12-01), Wittmann et al.
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