The Spiraflo's peripheral-feed design provides the best hydraulic flow pattern and minimizes many of the problems associated with centre-feed hydraulics.
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Flow energy is dissipated in the peripheral-feed raceway so that when it enters the main settling area the sludge blanket is not disturbed. There is no "wall-creep" as the effluent weir troughs are centrally located.
Short circuiting is virtually impossible with the peripheral-feed skirt design. The skirt forms an influent raceway and extending from the top of the tank to within a few feet of the bottom it creates a gentle spiralling flow and ensures maximum use of the entire tank volume. Another benefit provided by the influent raceway is the collection of scum in this area formed around the tank periphery, separate from the main settling area. The scum is very simply pushed to a single takeoff point by a race skimmer attached to the rotating sludge scraper arm.
As the Spiraflo equipment includes the effluent weir troughs for suspension in the centre of the tank there is no costly forming of a peripheral concrete trough like the centre-feed type of clarifier. Additional equipment such as Stamford baffles, energy dissipation feed-wells, flocculation wells and mid-radius baffles that are often used with centre-feeds to combat short circuiting and the waterfall effect are not required with the Spiraflo.