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| Leopold®
Tertiary Filter Systems |
Leopold filter systems are a powerful and reliable solution for municipal
wastewater treatment. A Leopold filter is planned based on particular
upstream conditions. Each aspect—filter media, filter controls,
design parameters—is tuned to achieve maximum filtration efficiency
at the longest possible filtration cycles. But more importantly, Leopold
filter systems are designed and engineered to meet your permit requirements.
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| Operating
Principle
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Normal
Filter Cycle
- Suspended particulates are removed from water by flowing the water
via gravity through filter media at a high rate.
- The solids are removed within the depth of the granular material.
- Filtered water is removed from the filter through an underdrain system.
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Backwash
Cycle
- Cleaning the filter media is accomplished with an upflow water wash
with either full bed fluidization or sub-fluidization depending upon
the media.
- Air scour ensures thorough cleaning resulting from higher shear forces
in the media bed and abrasion between grains.
- The volume of water above the filter bed increases to just above the
edge of the waste gullet.
- Dirt is dislodged and flushed out of the media, pushed to the surface
of the water by the upward flow, and captured via water overflow into
the waste gullet.
- Dirty backwash water is evacuated from the filter for recovery.
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Features
and Benefits
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| Deep Bed Filtration |
Achieves optimum suspended solids removal due, in part, to
more efficient solids storage in the box. Handles wide swings in solids
loading while providing long filter runs.
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| Downflow Design |
Works with gravity, eliminating the need to pump influent through the
media, combining reduced power consumption and high filtration rates (6
gpm/sf or more).
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| Combined Air/Water Backwash |
Superior media cleaning; low backwash water consumption (<2%).
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| Flexibility in Filter Design |
Not restricted to one type of filter layout based on underdrain design
limitations. System can be designed to a variety of site conditions or to
existing filter basins. |
