Evaluation of RBC (Rotating Biological Contactor) Scale-Up,
PITTSBURGH UNIV PA DEPT OF CIVIL ENGINEERING
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According to this investigation, when a full-scale RBC plant design is based on the essential controlling variables of influent soluble BOD concentration, wastewater temperature, number of disc stages, surface hydraulic loading, and BOD removal requirement, the preliminary design criteria developed from pilot plant study cannot be directly employed for design. A scale-up factor should be used. This factor was successfully determined by the model proposed by Wu et al. Its relation to wastewater temperature was mathematically formulated by conducting non-linear least squares regression analysis on both full-scale and pilot-scale data previously reported by other investigators. It is apparent that the process scale-up increases from 1.067 at T 3 C to 1.227 at T 25 C. However, a decrease in the scale-up factor was found when the temperature exceeded 25 C. This study shows the effect of process scale-up on the selection of hydraulic loading for full-scale design is significant when the wastewater temperature and hydraulic loading determined during the pilot study are high.