CHARACTERIZATION PROFILES AND CORRELATION OF MAJOR PARAMETERS IN A FULL-SCALE BIOLOGICAL PHOSPHORUS REMOVAL SYSTEM

摘要

Parameters bearing on the performance of a full-scale 88-MGD EBPR system were examined. Samples were collected for a 10-month period in a basin and in a secondary clarifier of the plant. Samples were analyzed for nitrate, total and ortho P, COD, ammonia, alkalinity, TSS, ORP, pH, and DO. Profiles of ORP throughout the EBPR system paralleled DO concentrations. Low DO in the secondary clarifier may promote denitrification. Strong or weak denitrification in secondary clarifiers may be detrimental to the EBPR performance owing to loss of phosphorusladen biomass (strong denitrification) or preservation of interfering nitrate in the system (weak denitrification). Moderate denitrification in the secondary clarifier may be beneficial to EBPR efficiency owing to the removal of nitrate as a competitive electron acceptor. A correlation was found between TSS and nitrate concentrations in the RAS, indicating that the former may serve as a good parameter for controlling denitrification in secondary clarifiers.