The Premarc Corporation - Products - CDS Technologies

MEDIA FILTRATION SYSTEM

For hundreds of years, filtering water through media has been widely recognized as one of the most effective methods for treatment of public water supply and industrial sites. For storm water applications, media filtration products are simple direct filtering systems, whereby the water needs enough energy to push through the porous media. The basics of water treatment using media filtration require that pollutants or solids precipitate, adsorb or absorb themselves to the media, and CDS has designed its system to do just that. When regulations call for higher removal of a finer gradation of fine and suspended particles, the CDS Media Filtration System can be relied on to meet the challenge.

Process

The CDS Media Filtration System provides more fine media filtration per plan view square foot area than any storm water filter product available today. The System is composed of rechargeable media-filled cartridges to target and remove specific pollutants, such as heavy metals, oils, greases and fine gradations of suspended solids. The CDS media filtration cartridge is designed to accept various types of media that can be easily replaced or exchanged at any time.

The single float control assembly that activates filtration of all cartridges is a proven technology constructed of high quality stainless steel, and is the only moving part in the treatment system. The assembly is isolated from the treatment area to protect the mechanism from any potential obstructions including fouling pollutants.

A series of media-filled cartridges and a sedimentation bay below the cartridges is used to capture and settle out larger particles.
Higher quality water reaches the cartridges for filtration, because a large portion of pollutants are pre-settled and held below the cartridges.
Sediment bay stores pollutants up to 16 inches thick.
Single float valve ensures that treatment flow matches inflow, which provides the lowest possible hydraulic loading rate on each cartridge and translates to higher removal efficiencies than siphon-activated systems.
Cartridges designed to variable handle 7.5 - 18 gallons per minutes.
System treats flow rates ranging from less than 1 cubic foot per second (cfs) to flows in excess of 10-cfs.

Unique Design Features

The hydraulic operation activates all cartridges simultaneously, ensuring even hydraulic loading through the entire bed of filter cartridges for more pollutant removal.
The float control assembly is visible from the surface, rather than concealed within the cartridge, allowing operators to assess functionality and make adjustments for proper operation.
The system is designed with storage for the accumulation of solids below the cartridges to prevent build-up of material on the cartridges themselves. This pre-sedimentation increases the runtime and life cycle of the filter cartridges.
The system is flexibly designed to drain to levels below the cartridges following storm events or completely drain the entire vault. This ensures that the cartridges are not submerged during low flow events or due to nuisance flows. These conditions lead to biological growths that have plagued other systems. Completely draining the vault eliminates vector concerns.

Configurations

The Media Filtration System can be configured inside either precast or cast-in-place concrete vaults or simple precast manhole structures. Its scalability ranges from small developments using round or square catch basins, manholes and precast vaults, to larger developments requiring cast-in-place concrete structures.

When combined with a standard CDS unit upfront for pretreatment, the two systems serve as a treatment train to more thoroughly and efficiently remove a wide range of pollutants from the water column.

Maintenance

Maintenance of the CDS Media Filtration System can be performed by any qualified personnel and does not require specialized or proprietary equipment or media. Since maintenance intervals of any storm water BMP are highly site-specific, CDS recommends the cleaning and inspection schedule below to ensure successful operation of the Media Filtration System. Detailed Operations and Maintenance Guidelines are available from CDS Technologies Inc.

ANNUAL MAINTENANCE:

FALL:
Inspect system prior to rainy season. Observe floatable accumulation; check inlet and outlet pipes for obstructions.

WINTER:
If possible, observe system during a storm event to determine whether or not water is in bypass due to clogging of the media. Measure depth of material in the sediment bay below the cartridges.

SUMMER:
In the dry season, recharge or replace media and cartridges as necessary, and remove floatable trash and debris.

TWO-THREE YEAR MAINTENANCE:

Replace filter cartridges and clean sediment storage area below cartridges.

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