pH and oxidation-reduction potential control strategy for optimization of nitrogen removal in an alternating aerobic-anoxic system.

摘要: An alternating aerobic and anoxic (AAA) system is a continuous-flow, activated-sludge process in which the environmental conditions necessary to meet specific requirements for nitrification denitrification are created. Because of stricter regulations on wastewater effluent concerns energy consumption, control now becoming more important. A bench-scale AAA with different fixed aeration ratios was operated than 8 months evaluate effects total cycle time ratio performance develop feasible scheme. With supplemental organic addition, shows removal efficiencies 85 90% 78 82% chemical oxygen demand nitrogen, respectively. The oxidation-reduction potential (ORP) pH profiles indicate that can be controlled by point (ammonia valley) profile indicating end another (nitrate knee) On ORP signifying denitrification. Thus, dual strategy points used terminating aerobic-anoxic initiating anoxic-aerobic cycles an system, online excellent, significant saving (average ratio, f = 0.23) as compared systems (f 0.33 approximately 0.5).