Biofilm carrier, method of manufacture thereof and waste water treatment system employing biofilm carrier
First Claim
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1. A waste water treatment system comprising:
- a basin;
at least one airlift, operating in said basin, comprising a series of airlifts including;
an initial air lift assembly including an upstream partition which extends downwardly from a top location above a water level in said basin to a bottom location spaced from a bottom of said basin; and
at least one intermediate air lift assembly; and
a multiplicity of plastic biofilm support elements disposed in said basin for cooperation with said at least one airlift, said plastic biofilm support elements having a maximum dimension which does not exceed 50 mm and having a specific gravity of between approximately 0.70-0.91, whereby supplying waste water from an upstream side of said basin, by providing a flow of water from a waste water inlet to a treated water outlet and allowing said waste water, but generally not said support elements, to flow from said water inlet to said water outlet and operating said at least one airlift provides aerobic waste water flow therein in operative engagement with said support elements, wherein said flow is an undulating flow and includes passage under said upstream partition which is of relatively low volume and generally does not carry said support elements into said series of air lifts, thereby constraining said particles to reside outside of and between said series of air lifts.
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Abstract
A biofilm support including a plastic biofilm support element having a maximum dimension which does not exceed 50 mm and having a specific gravity of between approximately 0.70-0.91. A method of manufacture of a biofilm support and a waste water treatment system employing the biofilm support are also disclosed.
79 Citations
53 Claims
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1. A waste water treatment system comprising:
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a basin;
at least one airlift, operating in said basin, comprising a series of airlifts including;
an initial air lift assembly including an upstream partition which extends downwardly from a top location above a water level in said basin to a bottom location spaced from a bottom of said basin; and
at least one intermediate air lift assembly; and
a multiplicity of plastic biofilm support elements disposed in said basin for cooperation with said at least one airlift, said plastic biofilm support elements having a maximum dimension which does not exceed 50 mm and having a specific gravity of between approximately 0.70-0.91, whereby supplying waste water from an upstream side of said basin, by providing a flow of water from a waste water inlet to a treated water outlet and allowing said waste water, but generally not said support elements, to flow from said water inlet to said water outlet and operating said at least one airlift provides aerobic waste water flow therein in operative engagement with said support elements, wherein said flow is an undulating flow and includes passage under said upstream partition which is of relatively low volume and generally does not carry said support elements into said series of air lifts, thereby constraining said particles to reside outside of and between said series of air lifts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A waste water treatment system comprising:
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a basin;
at least one airlift, operating in said basin, comprising a series of airlifts including;
an initial air lift assembly including an upstream partition which extends downwardly from a top location above a water level in said basin to a bottom location spaced from a bottom of said basin; and
at least one intermediate air lift assembly; and
a multiplicity of plastic biofilm support elements disposed in said basin for cooperation with said at least one airlift, said plastic biofilm support elements having a generally cylindrical configuration and including a plurality of radially extending surfaces extending outwardly from a generally solid center, whereby supplying waste water from an upstream side of said basin, by providing a flow of water from a waste water inlet to a treated water outlet and allowing said waste water, but generally not said support elements, to flow from said water inlet to said water outlet and operating said at least one airlift provides aerobic waste water flow therein in operative engagement with said support elements, wherein said flow is an undulating flow and includes passage under said upstream partition which is of relatively low volume and generally does not carry said support elements into said series of air lifts, thereby constraining said particles to reside outside of and between said series of air lifts. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A waste water treatment system comprising:
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a basin;
at least one airlift, operating in said basis, comprising a series of airlifts including;
an initial air lift assembly including an upstream partition which extends downwardly from a top location above a water level in said basin to a bottom location spaced from a bottom of said basin; and
at least one intermediate air lift assembly; and
a multiplicity of plastic biofilm support elements disposed in said basin for cooperation with said at least one airlift, said plastic biofilm support elements having a maximum dimension which does not exceed 50 mm and including a plurality of roughened biofilm adherence surfaces integrally formed as one piece therewith, whereby supplying waste water from an upstream side of said basin, by providing a flow of water from a waste water inlet to a treated water outlet and allowing said waste water, but generally not said support elements, to flow from said water inlet to said water outlet and operating said at least one airlift provides aerobic waste water flow therein in operative engagement with said support elements, wherein said flow is an undulating flow and includes passage under said upstream partition which is of relatively low volume and generally does not carry said support elements into said series of air lifts, thereby constraining said particles to reside outside of and between said series of air lifts. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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Specification