FilterWorx™ Control System
Suspended particulates are removed from water by flowing the water via gravity through a dual media — usually anthracite coal over sand — 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 for further downstream treatment.
Cleaning the filter media is accomplished with an upflow water wash with full bed fluidization. Air scour is also used to ensure thorough cleaning resulting from higher shear forces in the media bed and abrasion between grains. Both the backwash water and air scour are introduced into the bottom of the media bed through the underdrain system.
During backwash the volume of water above the filter media bed increases to just above the backwash trough edge. 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 backwash troughs. Dirty backwash water is evacuated from the filter for recovery.
| Downflow Design | Works with gravity, eliminating the need to pump influent through the media |
| Depth Filtration | More versatile in meeting a variety of source water conditions. |
| Rapid Rate Filtration | Higher production rates. |
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| Underdrain | ||
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The underdrain evacuates filtered water from the filter during the filter run and introduces water and air during backwashing and air scour. Leopold employs an underdrain system featuring advanced Leopold® Type S® technology. Leopold® Type S® technology underdrain is designed to provide uniform distribution of wash water and air to clean every corner of the filter without media upset. Leopold® Universal® Type S® and Type SL® underdrain deliver a broader airflow range — from 1 to 5 scfm/ft. Air stability is improved with all orifices providing uniform and continuous airflow. Water maldistribution is lower — less than +/-3 percent.Type S® underdrain is ideal for designs requiring longer laterals. Type SL® underdrain features a lower profile, making it ideal for shallow filters where greater filter media depth is desired. Both feature the dual parallel lateral design pioneered by Leopold, ensuring uniform distribution of water and air at each dispersion orifice opening even in extra long lengths. Both feature a unique water recovery channel for superior air scouring and water backwash performance. Both are constructed of high-density polyethylene (HDPE) construction for strength and corrosion resistance. For assistance in selecting the right Leopold® Type S® technology underdrain for your installation, contact the Leopold Application Engineering Group. |
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| Media Support | ||
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Leopold® IMS® (Integral Media Support) cap is the porous plate developed by Leopold as a replacement for support gravel in filter beds equipped with Leopold underdrain. It comes factory-installed on top of the underdrain block. By eliminating the support gravel, the overall depth of the filter can be reduced which could also allow for deeper media in existing filters. In addition, Leopold® IMS® cap allows for easy removal and change of media such as activated carbon. For more information on Leopold® IMS® cap for your installation, contact the Leopold Application Engineering Group |
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| Backwash Water Troughs | ||
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Leopold® backwash
water troughs provide uniform removal of wash water during filter
backwashing. They are molded of densely laminated fiberglass-reinforced
plastic (FRP) for maintenance-free durability and long service life.
Their resin-rich interior surface minimizes flow resistance. And they
are designed and manufactured for rigidity and dimensional accuracy.
Leopold® backwash water troughs are available in a wide selection
of carrying capabilities to meet any filter design requirement. Get assistance in sizing and locating Leopold® backwash water troughs for your filter by contacting the Leopold Application Engineering Group.  Click here for more information. |
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| Media Baffles | ||
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Leopold® Trough-Guard™ media baffles are a stainless steel assembly that is fastened onto both sides of washwater troughs to help ensure that no significant media loss occurs during concurrent air/water backwash at recommended rates. The media baffles create a quiet, air-bubble-free zone where media settles out and returns to the filter bed. Applied in conjunction with the Leopold® FilterWorx™ automatic filter control system, Trough-Guard™ media baffles not only reduce media loss, but also provide optimum cleaning of the media. Contact the Leopold Application Engineering Group for assistance in specifying Leopold Trough-Guard media baffles.
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| Filter Media | ||
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The filter
media in a Leopold filter — media quality, bed composition, bed depth,
and grain size distribution — is designed according to filter configuration,
raw water quality, pretreatment, and desired filtrate quality. Leopold
filters employ Engineered Filter Media® anthracite, the lowest uniformity
coefficient (UC) anthracite filter media available. Leopold® Engineered
Filter Media® anthracite typically produces consistent improvements
in turbidity removal due, in part, to more efficient solids loading.
Plus, low-UC media produces smaller changes in effluent turbidity
during periods of peak influent turbidity. Leopold readily supplies a full scope of media for filter designs. In addition to filter anthracite in all sizes and UCs, Leopold can provide:
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| FilterWorx™ Filter Control System | ||
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Leopold®
filters include a complete filter control package to keep a constant
watch on the essential parameters of the processes in the filter plant
— both upstream and downstream. These automatic control systems continuously
monitor filtrate quality to ensure that it meets regulatory requirements.
They continuously monitor the condition of the filter media to ensure
optimum filtration. And they automatically adjust flow rates to compensate
for customer demand changes. By continuously monitoring water quality and filter condition, Leopold® filter controls can automatically initiate and control the backwash sequence. This means the filter is cleaned when it needs to be cleaned, as frequently or infrequently as changing conditions require, and as long as necessary to clean the media. Filter run times and product quality are optimized at the lowest possible cost. And by keeping the filter media well-conditioned, the life of the filter can be lengthened. By automatically sequencing backwash properly, Leopold® filter controls help avoid surges and potentially disastrous upsets which can damage a filter system and cost money. Contact the Leopold Application Engineering Group for assistance in designing and specifying your Leopold® filter control system.  Click here for more information. |
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| Flume | ||
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A Leopold® filter can be arranged with a front flume, center flume, or H flume to achieve the best and most cost-effective layout. A Leopold® Flat-Bottom Flume® filter allows substantial cost savings in excavation and support structures. The air distribution header is engineered by Leopold to meet specific backwash requirements and custom-fabricated to fit specific filter designs Consult the Leopold Application Engineering Group to determine the best and most cost-effective layout for your filter. |
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