Automatic control strategy for biological nitrogen removal of low C/N wastewater in a sequencing batch reactor

• Published in: Water Science & Technology Vol. 50; no. 10; pp. 45 - 50
• Main Authors: Kishida, N, Kim, J H, Chen, M, Tsuneda, S, Sasaki, H, Sudo, R
• Format: Journal Article Conference Proceeding
• Language: English
• Published: England IWA Publishing 01.01.2004
• Subjects: Automatic control systems; Bacteria, Anaerobic - metabolism; Batch reactors; Bioreactors; Carbon; Carbon - isolation & purification; Carbon - metabolism; Cities; Control systems; Denitrification; Germany; Hydraulic retention time; Hydrogen-Ion Concentration; Nitrification; Nitrites - chemistry; Nitrites - metabolism; Nitrogen; Nitrogen - isolation & purification; Nitrogen - metabolism; Nitrogen removal; Organic carbon; Oxidation; Oxidation-Reduction; Oxidation-reduction potential; Quaternary Ammonium Compounds - isolation & purification; Quaternary Ammonium Compounds - metabolism; Reactors; Redox reactions; Retention time; Sequencing batch reactor; Sewage - chemistry; Sewage - microbiology; Time Factors; Variation; Waste Disposal, Fluid - methods; Wastewater treatment; Water Movements; Water Pollutants - isolation & purification; Germany
• ISBN: 1843394863; 9781843394860
• ISSN: 0273-1223; 1996-9732
• DOI: 10.2166/wst.2004.0605

To establish an automatic control system of external carbon addition in biological nitrogen removal, a bench-scale sequencing batch reactor with real-time control strategy was designed in this study. An oxidation-reduction potential (ORP) profile was used for automatic control of external carbon addition. The mean removal efficiency of total organic carbon was over 98%. Complete denitrification in an anoxic phase and complete denitrification and nitrification in anoxic and oxic phases were accomplished, respectively, because the oxic and anoxic periods were also appropriately controlled with ORP and pH profiles, respectively. Mean removal efficiency of total nitrogen was over 95%. When concentration of influent wastewater was changed, volume of additional carbon was automatically changed with the influent fluctuation, and flexible hydraulic retention time was achieved in this system.