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- W2401277002 abstract "Performance of an existing, full-scale municipal rotating biological contactor (RBC) plant using supplemental aeration was studied. Two four-stage trains were used under var ious organic loading conditions with one as a control. The results from this study indicate that the use of supplemental air not only improves the carbonaceous substrate removal, but also signifi cantly enhances the nitrification ability of the RBC treatment system. J. Water Pollut. Control Fed, 61, 200 (1989). ing its effluent standards when operating at 68% of its design load. The plant experienced both shaft and media failure caused by heavy biomass growth in all stages. Odors from the RBC system were so significant that residents living in the vicinity of the plant complained frequently. The study evaluated the effectiveness of supplemental aeration in improving RBC performance. To accomplish this, it was necessary to have a treatment plant with a minimum of two parallel RBC trains. The RBC treatment plant had two parallel trains with four stages in each train, as shown in Figure 2. One train was used as a control (the south train) and the other train (the north train) was used to evaluate treatment improvement using supplemental aeration. All of the north RBC units were provided with supplemental air by installing fine-bubble reef diffusers. Four reef diffusers that were 0.61 m X 0.46 m (2 ft X 1.5 ft) were provided in each of the four RBC stages. Air was supplied from an existing 0.151 m3/s (320 cu ft/min) blower using polyvinyl chloride and flexible piping. These fine-bubble diffusers had high oxygen transfer capacities with air flow rate capacities of 0 to 0.152 m3/m2 s (30 cu ft/sq ft min). Each air diffuser unit was provided with separate shut-off valves so that it could be individually removed, inspected, cleaned, and returned to service in" @default.
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- W2401277002 date "1989-01-01" @default.
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- W2401277002 title "Supplemental aeration enhanced nitrification in a secondary RBC plant" @default.
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