Wastewater treatment system

Details Wastewater treatment system Wastewater treatment system

1993-06-01

1994-09-06

Upton, Christopher

Liquid purification or separation

Processes

Treatment by living organism

210624, 210626, 210629, 2101951, 2101953, 210220, C02F 322

Patent

active

053445635

ABSTRACT:
A wastewater treatment system and method is disclosed, including a circular aeration basin and a contiguous annular clarifier channel. Rotational flow of an aerated mixture of untreated wastewater and return sludge is induced in the aeration basin at its periphery with relatively less turbulent flow at the center.
A clarifier inlet is fluidly connected to the aeration basin through openings provided in the aeration basin wall, the clarifier inlet including means to dissipate turbulence.
A sludge removal manifold extends within the clarifier having valve-controlled suction arms. The spaced suction arms provide for precise control of sludge blanket depth and sludge age independent of rate of sludge return to the basin.
Process sludge withdrawn from the clarifier is mixed with raw wastewater and returned to the aeration basin.
The relatively less-turbulent flow in the central area of the basin allows process sludge to accumulate in said central area. A drain provided centrally in the aeration basin allows for draw-off of such digested sludge.

REFERENCES:
patent: 3897000 (1975-07-01), Mandt
patent: 4166790 (1979-09-01), Zlokurnik et al.
patent: 4189384 (1980-02-01), Fontein et al.
patent: 4440645 (1984-04-01), Kite
patent: 4690764 (1987-09-01), Okumura et al.
patent: 5198105 (1993-03-01), Kanting et al.

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