Liquid purification or separation – Constituent mixture variation responsive
Patent
1994-10-28
1995-12-19
Cintins, Ivars
Liquid purification or separation
Constituent mixture variation responsive
210104, 210137, 2101951, 210926, C02F 318
Patent
active
054765838
ABSTRACT:
In an extended aeration wastewater treatment system having wastewater flowing into a retention basin so as to form mixed liquor within the retention basin, the treated mixed liquor flowing out of retention basin through a retention basin exit line to an external clarifier, a mixed liquor wasting system is provided, comprising a thickener tank, having a sidewall and a bottom; a waste line having a first end and a second end, the first end fluidly connected to the retention basin by connection to the retention basin exit line, and the second end fluidly connected to the thickener tank; a first flow control device, such as a pump, for continuously removing a portion of the mixed liquor from the basin at a desired constant flow rate through the waste line, positioned in the waste line; a sludge removal line having a first end and a second end, the first end fluidly connected to the bottom of the thickener tank, and the second end fluidly connected to a sludge disposal system; a second flow control device, such as a pump, for removing a concentrated portion of the mixed liquor from the thickener tank, positioned in the sludge removal line; and a return line having a first end and a second end, the first end fluidly connected to the thickener tank above the bottom, and the second end fluidly connected to the retention basin. A method for wasting mixed liquor is provided, comprising the step of continuously removing a portion of the mixed liquor from the basin at a desired constant flow rate.
REFERENCES:
patent: 3905904 (1975-09-01), Cherne et al.
patent: 4383922 (1983-05-01), Beard
patent: 4614589 (1986-09-01), Weis
Cintins Ivars
United Industries, Inc.
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