Evaluating operation strategies and process stability of a single stage nitritation-anammox SBR by use of the oxidation-reduction potential (ORP)

► Investigation of different cycle patterns for nitritation-anammox SBRs. ► New combination of interval feeding with interval aeration most suitable for operation. ► ORP as indicator parameter in a single stage nitritation-anammox SBRs. ► Correlation of ORP slope and air flow rate, maximum ORP value and ammonium loading for process control. ► Substrate depletion (ammonium and oxygen) recognition fastest by ORP signal.