ORP as a control parameter in a single sludge biological nitrogen and phosphorus removal activated sludge system

Abstract

This study was carried out at full scale on the St Mars la Jaille activated sludge system (Western France), which is one of the first successful biological excess phosphorus removal systems in Europe. The aim of the study was to show how the parameter oxidation reduction potential (ORP) can be used to optimise biogical nitrogen and phosphorus removal in a two series reactor system, by controlling air supply to the second aeration tank (for nitrification and denitrification) and monitoring anaerobiosis in the first non-aerated tank