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Surface aerator for aeration tank at activated sludge sewage treatment plant (at Morro Alto Treatment Plant, Vespasiano, Brazil) Vertically mounted tubes of up to 1-metre (3.3 ft) diameter extending from just above the base of a deep concrete tank to just below the surface of the sewage liquor. A typical shaft might be 10 metres (33 ft) high.
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related to: kohler 1.5 gpm aerator for sale by owner craigslist madison wi mobile homes for sale