Start-Up and Shock Loading Characteristics of a Rotating Biological Contactor Package Plant,
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF CIVIL ENGINEERING
Pagination or Media Count:
The purpose of this investigation is to provide start-up and shock loading response data for an RBC pilot plant receiving primary effluent from a municipal wastewater treatment plant. In general, Chemical Oxygen Demand COD removal was only moderately affected by the hydraulic shocks. As expected COD removal was affected least by the shorter 8-hour shock loadings. Under normal operating conditions the last three stages of the rotor zone removed very little COD. These stages were incapable of removing larger COD concentrations for short term hydraulic shock loadings. Nitrification was more inhibited than COD removal. In each instance nitrification was quickly inhibited to a significant degree. Recovery was slower than that of COD removal with a minimum of 24 hours required. Peak DO concentrations declined during each hydraulic shock loading. The decrease began when the flow rate returned to normal. Sufficient DO concentrations were available for COD removal and nitrification at all times. Biomass stability was excellent throughout the hydraulic shock loadings. Unusual or excessive sloughing did not occur as evidenced by SS concentrations.