Product Focus - Finer Filtration: Separation Technology Helps WWTP Reduce Pollutants in Effluent

The Village of Maybrook WWTP in Orange County, N.Y., has planned to upgrade its facility and expand its capacity to meet more stringent SPDES requirements. As part of the process, the township will incorporate a new filtration technology from Kruger Inc.

Nov 7th, 2013
Kruger 1311ww
The Kruger Hydrotech Discfilter is simple, effective and economical filtration for tertiary filtration, water reuse, and solids removal.

The Village of Maybrook Wastewater Treatment Plant (WWTP) in Orange County, N.Y., has planned to upgrade its facility and expand its capacity to meet more stringent State Pollutant Discharge Elimination System (SPDES) requirements. As part of the process, the township will incorporate a new filtration technology from Kruger Inc.

A subsidiary of Veolia Water Solutions & Technologies (France), Kruger was awarded a contract to furnish its Hydrotech Discfilter system for the renovation based on its simple, effective and economical separation with a small footprint. The new technology will consist of two units, each sized to treat a peak flow of 1.8 MGD, designed to provide an effluent TSS of ≤5 mg/L. The facility will continue to discharge to a tributary of the Otter Kill Creek.

The Hydrotech Discfilter system employs woven cloth filter elements installed on multiple discs and utilizes an inside-out flow pattern, providing a large filtration area with a footprint about 75 percent smaller than traditional sand filters. The filter is ideal for effluent polishing from a number of process trains, including activated sludge, high rate clarification, MBBR, RBC, and trickling filters, and is used to produce reuse-quality effluent and achieve phosphorus concentrations of < 0.1 mg/L.

The Kruger Hydrotech Discfilter system is a versatile solution for a variety of applications including solids removal, tertiary wastewater filtration and water reuse, as well as membrane pre-treatment, phosphorus removal and stormwater treatment. Likewise, it was selected for Maybrook's WWTP to reduce pollutant discharges, conserve energy and improve overall costs and operations throughout the facility.

The water to be treated flows by gravity into the filter segments from the center drum. The media mounted on both sides of the partially-submerged discs separates the solids from the water, and solids catch on the inside of the filter panels mounted on the two sides of the disc segments.

Once solids have accumulated on the inside of the media, the discs are cleaned by the counter-current backwash system. High-pressure rinse water washes the solids off the filter media into the solids collection trough, typically requiring 0.05 to 3 percent of the total filtered water flow. The filtered water then flows through the disc media into the collection tank.

The Discfilters are available for placement into concrete basins or as stand-alone units with a stainless steel tank included. The innovative, space-saving design and low hydraulic profile make the Kruger Hydrotech Discfilter an ideal solution for both green-field projects and those requiring retrofit of existing sand filters. It is also Title 22 approved and has straight-forward controls, providing utilities with ease of installation.

There are currently more than 1,300 Hydrotech Discfilter units in operation worldwide and more than 200 in North America. These systems range in capacity from less than 100 gpm to more than 75 MGD, allowing Kruger to provide a proven design for almost any capacity. The filters can be expandable to accommodate varying flows and are in continuous operation even during backwash and high solids events.

Maybrook's new process is expected to be operational in the spring of 2014.

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