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Automatic Addition Control of the External Carbon Source by the Measurement of ORP in Biological Nitrogen Removal Process
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 Title & Authors
Automatic Addition Control of the External Carbon Source by the Measurement of ORP in Biological Nitrogen Removal Process
Shin, Choon-Hwan;
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For the cost-effective biological nitrogen removal (BNR) process whose characteristics of influent have low COD/N ratios, the automatic control system for the addition of external carbon based on oxidation-reduction potential (ORP) data in an anoxic reactor has been developed. In this study, it was carried out with a pilot-scale Bardenpho process which was consisted of anoxic 1, aerobic 1, aerobic 2, anoxic 2, aerobic 3 tank and clarifier. Firstly, the correlation coefficient () of the dosage of external carbon source and ORP value was about 0.97. Consequently, the automatic control system using ORP showed that the dosage of external carbon source was decreased by about 20% compared with a stable dosage of 75 mg/L based on the COD/N ratio of the anoxic influent.
Biological nitrogen removal;External carbon source;COD/N ratio;Oxidation-reduction potential;PID control;
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