Swirl Concentrators Revisited. The American Experience and New German Technology

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by William C. Pisano, Environmental Design & Planning, Inc, United States,

Document Type: Proceeding Paper

Part of: Design of Urban Runoff Quality Controls

Abstract: The Swirl Concentrator is a small, compact, 'no moving parts' solids separation device. Its function is to act as as a static combined sewer overflow (CSO) regulation chamber. Only dry weather flow is intercepted for discharge to downstream wastewater treatment plant (WWTP). During wet weather the unit's outflow is throttled, causing the unit to fill and to self-induce a 'swirling' vortex-like operation. Secondary flow currents rapidly separate 'first flush' settleable grit and floatable matter. Concentrated foul matter are intercepted for treatment while the cleaner, treated flow discharges to receiving waters. This paper overviews the American experience and recomends corrective measures. In the mid 80's, English and German investigators developed insights into the American swirl performance problems, and have developed new improved versions similar to the earlier English design. One prototype installation in West Germany was implemented in August, 1987 and is currently being tested. Highlights or two US projects using this new German technology (design phase) are also presented.

Subject Headings: Wastewater treatment plants | Water flow | Water discharge | Combined sewers | Overflow | Secondary flow | Regulated flow | Solid mechanics | Germany | Europe

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