Liquid purification or separation – With means to add treating material – With distinct reactor tank – trough or compartment
Patent
1992-02-18
1993-06-08
Lithgow, Thomas M.
Liquid purification or separation
With means to add treating material
With distinct reactor tank, trough or compartment
210220, 2105321, 2101953, 210197, B01D 2124, C02F 900, C02F 1100
Patent
active
052176096
ABSTRACT:
The clarifier in any activated sludge sewage treatment plant must provide (a) a quiescent environment to allow gravity settling of the bio-mass (sludge) grown within the aeration tank, (b) the decanting of clear supernatant thus produced, and (c) the timely removal of all accumulated clarifier sludge. This invention improves prior clarifier performance by (a) providing vacuum assistance to gravity settling, (b) trapping all sedimentation within an aerated sludge containment zone, (c) providing clarifier sludge aeration to prevent denitrification, (d) utilization of spent aeration air for energy-free return sludge pumping, (e) the elimination of density currents and induced currents created by return sludge pumping, and (f) providing uniform hydraulic sludge collection eliminating the need for mechanical collection. The lower portion of the clarifier walls must be inward sloped to provide a hopper bottom. This invention then provides prefabricated hood(s), strategically placed over the hopper walls to form a sludge containment zone. The hood supports shall maintain continuous and adjustable spacing between the hood's lower edges and the hopper walls, forming access slots for sedimentation to enter the containment zone. The hopper sides shall continue their inward slope down and under the hood. The upper sides of the hood shall likewise be properly sloped to compliment the hopper slope. This invention invention shall provide aeration diffusers for uniform and consistent aeration without diffuser leveling and located below the hood, near the floor. Their size and placement are critical to (a) create a uniform vertically disposed rolling current to collect sedimentation below the protective hood and (b) insure entrapment of all entrained air and sedimentation. The aerators shall also provide free oxygen to negate potential clarifier sludge denitrification.
REFERENCES:
patent: 2732944 (1956-01-01), Hays
patent: 2883060 (1959-04-01), Griffith
patent: 3537583 (1970-11-01), Wahner
patent: 3975276 (1976-08-01), Schmid
patent: 4008159 (1977-02-01), Besik
patent: 4033875 (1977-07-01), Besik
patent: 4670142 (1987-06-01), Lowry
patent: 4966705 (1990-10-01), Jamieson
patent: 5035795 (1991-07-01), Schmid
LandOfFree
Combination sludge collector, aerator, and return pump does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combination sludge collector, aerator, and return pump, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combination sludge collector, aerator, and return pump will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1931599