DO, ORP and PH as Control Parameters in an SBBR for Nitrogen Removal and Energy Saving
Sequencing batch biofim reactor (SBBR) can remove nitrogen by simultaneous nitrification and denitrification in the biofilm. Based on the relationship between the degradation of COD, NH3-N and ΣN in wastewater and the variation of DO, ORP and pH, the results showed that when DO and ORP rapidly increased and reached a platform (DO and ORP turning point) and pH value rapidly decreased and approached the lowest value (pH turning point), the NH3-N and ΣN reduced to minimum. Utilizing DO, ORP and pH turning points as on-line controlling points to stop aeration ensured NH3-N completely removed and the lowest ΣN. The effect control of aeration time could save energy.
Hexing Li, Qunjie Xu and Daquan Zhang
T. Chen and J. Li, "DO, ORP and PH as Control Parameters in an SBBR for Nitrogen Removal and Energy Saving", Advanced Materials Research, Vols. 356-360, pp. 1684-1688, 2012