Liquid purification or separation – With gas-liquid surface contact means
Patent
1981-07-27
1983-08-02
Castel, Benoit
Liquid purification or separation
With gas-liquid surface contact means
261122, 261DIG72, C02F 306
Patent
active
043965075
ABSTRACT:
The ribbon-tube biofilter promotes bio-oxidation ahead of clarification in wastewater treatment and functions in hydraulic pumping, oxygenation, sparging, foam fractionation, aggregate formation, and passive thermal buffering. It is operated as single-pass or with recirculation, in series and(or) in parallel. The biofilter consists of a vertical tubular column containing a parallel array of thin plastic ribbons that form multiple, linear channels and serve as non-rigid support media for heterotrophic and autotrophic bacterial colonization. Wastewater and air (or oxygen) are passed through the column by gaslift and(or) mechanical pumping coupled with air eduction or oxygen injection upstream from the support media. Linear voids between ribbons are fixed by square mesh dimensions of base and top transverse mounting grids. An outer tube forms a concentric conduit for afferent flow, which is separated from the effluent by a partition above the influent port and below the top of the removable inner column to form a collection/header chamber for the effluent. As bacterial growth and metabolism proceed to equilibrium, cells eventually become unthrifty, die, lyse, or otherwise become unstable, slough off, and are carried out with the effluent. At the effluent, evolving gas is vented, water is collected, and sediment load may be separated by a conventional clarifier.
REFERENCES:
patent: 4181604 (1980-01-01), Onishi et al.
patent: 4231863 (1980-11-01), Sutphin
patent: 4246114 (1981-01-01), Krebs et al.
patent: 4294694 (1981-10-01), Coulthard
Aqua-Est Corporation
Castel Benoit
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