Liquid purification or separation – Processes – Treatment by living organism
Patent
1989-03-29
1990-07-10
Hruskoci, Peter
Liquid purification or separation
Processes
Treatment by living organism
210629, 210803, 2101951, 210199, 210219, 210256, 210528, 2105321, 210926, 210916, C02F 314
Patent
active
049405454
ABSTRACT:
A thickener well is provided in one end of a digester orbital ditch having a pair of channels and an elongated center partition spaced from a pair of ditch endwalls, the overall ditch forming a basin for digestion of wasted sludge. A curved endwall of the ditch provides a common curved top outer peripheral wall of the thickener well. The remainder of the well has a cylindrical configuration integral with the orbital ditch bottom and extending downwardly therefrom to a position below the horizontal plane of the ditch bottom. A sludge raking structure is positioned at the bottom of the well for periodically raking settled sludge into a sludge outlet at the bottom of the well. A surface aerator is provided between and spaced from the other ditch endwall and a juxtaposed end of the partition or other aeration apparatus mounted in a channel(s) to aerate and propel a liquid-solids sludge mixture wasted from a secondary treatment apparatus and fed into the orbital ditch. The mixture is circulated in the ditch and across and through a top portion of the well. The orbital ditch may be decanted by turning off the aerator, allowing a clear liquid top layer to form in the ditch and decanting the clear liquid from the tank by lowering a weir or by adding additional activated sludge to the ditch to displace clear liquid over a fixed weir.
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EPA Publication 62511-74-006, pp. 5-20 to 5-28 (referenced on page 2 lines 24 to page 3, line 3 of Applicants' specification.).
DiGregorio David
Eismin Richard J.
Riser Frederick M.
Baker Hughes Inc.
Hruskoci Peter
Upton Christopher
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