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Ecological fluidized bed method for the treatment of polluted water
| Details |
Inventors: Todd, John H.; Shaw, James M.;
Assignee: Ocean Arks International, Inc. (Falmouth, MA)
Primary Examiner: Cintins; Ivars
Assistant Examiner:
Attorney, Agent or Firm: Crowley; Richard P.
An ecological fluidized bed system and method for the processing of polluted water to provide treated water. The system comprises a fluidized bed container containing a layer of coarse media with a layer of fine media above it which has a buoyancy substantially similar to the polluted water, and particularly pumice rock having a high surface to volume ratio, an inlet to introduce water into the container, and an outlet to withdraw treated water, and either a mechanical pump in an anaerobic operation or an airlift pump in an aerobic operation. The system includes an ecosystem such as microorganisms, benthic animals, and higher aquatic plants for the purification of the polluted water within the container, and a pump means to provide for the rapid recirculation of the polluted water within the container with the fine media as a fluidized bed, with a recirculation rate up to a thousand times the flow-through water rate, thereby providing for the rapid, efficient and effective purification of the polluted water. |
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DETAILED DESCRIPTION The invention relates to a ecological fluidized bed system and method for the treatment and processing of polluted or waste water to provide a treated or purified water.
In particular, the invention concerns the employment of an ecological fluidized bed containing a semi-buoyant, but not limited to, fine particulate media and rapidly recycling or recirculating the polluted water with the semi-buoyant fine media in a water treatment ecosystem within the bed, so as to substantially increase the exposure of the polluted water to the community of the ecosystem prior to discharge of the treated water.
The invention comprises an ecological fluidized bed system for the processing of polluted water to provide treated water, which system comprises a fluidized bed container, which may either be a fixed container or a flexible plastic bag-type container.
The container contains a water-porous water filter layer of a coarse particulate media in the bottom of the container, and which coarse media is typically not subject to substantial movement by water flow through the container due to its density, and optionally may contain a porous mesh or other barrier sheet material on the upper surface thereof.
The container also includes a layer of, for instance, at rest, a fine particulate semi-buoyant media on or above the layer of coarse media, and which fine media material has a substantially neutral water buoyancy, for example, a specific gravity of 0.
9 to 1.
1, and is characterized by a high surface to volume ratio, for example, a surface area to volume ratio substantially greater than a smooth sphere.
Typically the media would have a roughened type, non-smooth surface and having a variable particle size with generally a mean particle size of less than about one inch in diameter and subject to being admixed with, moved and recycled with the polluted water in the container to form a fluidized bed of the water and fine media, and, for example, may comprise, but not be limited to, porous-type pumice rock or the like
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