ID: 1554: 13199
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Circular primary settling tanks normally have a center feed well with raw wastewater traveling from the center inlet toward the outer wall and discharging over peripheral overflow weirs into the effluent collection trough . Settled sludge is transported to a center collection sump by means of rotating scraper arms moving across the tank floor, driven by a central platform-mounted motor and gear assembly. A surface skimmer mechanism attached to the submerged sludge scraper arm rotates around the tank water surface and conveys floating material to a collection box.
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