Out of the Mainstream

by Gerald Hook, (M.ASCE), Assoc.; Stearns & Wheler Engineers & Scientists, 10 Albany St., Cazenovia, NY 13035,
Robert Armstrong, (M.ASCE), Asst. Engr.; Stearns & Wheler Engineers & Scientists, 10 Albany St., Cazenovia, NY 13035,


Serial Information: Civil Engineering—ASCE, 1988, Vol. 58, Issue 12, Pg. 64-66


Document Type: Feature article

Abstract:

By treating only part of the wastewater stream, a biological/chemical phosphorus removal system also reduces chemical costs and sludge production. The system consists of two 60 ft dia stripper tanks with 20 ft sidewall depths and a lime feed system. The phosphorus rich supernatant overflowing the stipper tanks is treated with lime, returned to the primary tanks and eventually settles into the primary sludge stream. This Phostrip system was recently examined at the Ithaca Area Wastewater Plant and shown to produce effluent phosphorus levels of less than 1.0 mg/1.

Subject Headings: Wastewater treatment | Phosphorus | Nutrient pollution | Sludge | Rivers and streams | Lime | Chemical treatment

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