Liquid purification or separation – Processes – Treatment by living organism
Patent
1997-12-17
2000-01-18
Wyse, Thomas G.
Liquid purification or separation
Processes
Treatment by living organism
210795, 210138, 210150, 210169, C02F 308
Patent
active
060154977
ABSTRACT:
A bio-treatment system for removing biological wastes from man-made tanks used to commercially cultivate aquatic animals. The system includes an aqua-culture tank in combination with a filtration tank wherein a screen is attached internally across the cross-section of the filtration tank above a buoyant filter media contained inside the filtration tank, the screen located at a higher level than a water level in the aqua-culture tank. Filtering of the water is accomplished by pumping water from the aqua-culture tank upwardly through the filtration tank and the buoyant filter media in the filtration tank. The filtered water flows out the top of the filtration tank and flows by gravity back to the aqua-culture tank. In order to periodically clean the buoyant filter media of accumulated wastes, water flow is stopped, allowing the water level in the filtration tank to lower and equalize with the water level in the aqua-culture tank, thereby allowing the buoyant filter media to drop away from the screen to form a floating, loose configuration of beads or pellets. The loosened buoyant filter media can be effectively agitated to dislodge the accumulated wastes, without using mechanical agitation devices, by injecting air or other gas into the filtration tank and through the buoyant filter media. Thereafter dislodged wastes are precipitated, discharged from the bio-treatment system and circulation resumed through cleaned filter media.
REFERENCES:
patent: 4115266 (1978-09-01), Oshima
patent: 5478473 (1995-12-01), Oshima
patent: 5593574 (1997-01-01), VanToever
patent: 5618431 (1997-04-01), Kondo et al.
patent: 5750041 (1998-05-01), Hirane
patent: 5770080 (1998-06-01), Malone
Lemoine Joseph L.
Mier Greg R.
Wyse Thomas G.
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