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Performance Evaluation of the Final Settling Tanks at New York City's Rockaway Water Pollution Control Plant Using the CRTC Protocol (Draft Manuscript)
Author: Eric J. Wahlberg, Jiye Zhang, Luis Carrio, Guy Pappaceno
Date: 1/394
Presented at the New York Environment Association 66th Annual Conference, New York, New York, January 31, 1994

The Clarifier Research Technical Committee's draft protocol for evaluating final settling tank performance was field applied at New York City's Rockaway Water Pollution Control Plant. The test tank was a rectangular unit 76.2 m (250 ft) long by 17.2 m (56.5 ft) wide with an average depth of 3.7 m (12 ft). The test tank consisted of three equally sized bays separated by knee walls approximately 1 m (3.3 ft) high. Sludge withdrawal was from a hopper located at mid-tank. Sludge collection flights upstream of the sludge hopper moved co-currently with respect to the flow through the tank. Conversely, sludge collection flights downstream of the sludge hopper moved counter-currently with respect to the flow through the tank.