Liquid purification or separation – With gas-liquid surface contact means
Patent
1989-01-23
1991-10-08
Wyse, Tom
Liquid purification or separation
With gas-liquid surface contact means
210188, 210197, 210205, 210220, C02F 308
Patent
active
050551868
ABSTRACT:
Disclosed are pellets for use in a fluidized bed type of system to provide optimum surface configuration and maximum effective surface area per unit volume for the culture of microorganisms. The pellets are of low density, preferably plaster, having a buoyancy relative to the liquid in which they are fluidized substantially neutral or slightly positive. The pellets preferably have indentations on its surfaces to enhance the growth of microorganisms. The pellets are manufactured by either cutting discs from an extruded filament or punching discs from sheets of the appropriate material, with indentations being formed during the process.
Also disclosed is an aquaculture apparatus and system in which the pellets are preferably used. The apparatus includes a chamber in which the pellets may be fluidized within a liquid having dissolved elements to be processed, the chamber including apparatus to create fluidization of pellets within the chamber to induce movement of the liquid and pellets whereby self scouring of the pellets is achieved to limit the build up of biofilm thereon. In the preferred aspects, the apparatus and system pertains to water purification and in particular to the treatment of a dissolved toxic waste in an aquaculture system to non-toxic forms through the fluidization of the pellets containing biogrowth thereon. The fluidization is induced by an air bubble wash of the sides of the chamber, the air also aerating the liquid for return to a fish culture tank.
REFERENCES:
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patent: 4470906 (1984-09-01), Frydman et al.
patent: 4618418 (1986-10-01), Heijnen et al.
patent: 4620931 (1986-11-01), Hirata et al.
patent: 4681685 (1987-07-01), Sutton et al.
patent: 4832848 (1989-05-01), Velebil et al.
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