For cost-effective nitrogen removal from sewage with low C/N ratios, an 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 modified Bardenpho process. This consisted of anoxic1, aerobic1, anoxic2 and aerobic2 stages with an external recycle ratio of 150% (Q/Qinf), and a media packing ratio of 2.4%-2.9% (v/v) in the aerobic reactor. As a result of applying the automatic control system for the minimization of the external carbon source dosage, the dosage was decreased by about 20%. This estimate was based on ORP compared with a stable dosage of 75mg/L based on the C/NOx-N ratio of the anoxic influent. It was necessary that the ORP set-value be regulated from -120 mV to Ð80 mV because influent NH4+-N concentration varied from 12 to 15 mg/L due to rainfall. Correspondingly, the demanded dosages were decreased. Drift of the the real-time value in control system was more stable after changing the ORP set-value from -120 mV to -80 mV.
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Research Article|
March 01 2004
Automatic control of external carbon source addition for nitrogen removal in sewage with low C/N ratios
H.U. Nam;
1Department of Environmental Engineering, Pusan National University, Busan, 609-735, Korea (E-mail: hai@pusan.ac.kr)
E-mail: hai@pusan.ac.kr
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Y.O. Kim;
Y.O. Kim
2Department of Environmental Engineering, Pusan National University, Busan, 609-735, Korea (E-mail: yokim@pusan.ac.kr)
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J.H. Lee;
J.H. Lee
3Water Protection Research Team, RIST, Hyoja-Dong, Pohang, 790-330, Korea (E-mail: jnhlee@list.re.kr)
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S.H. Hur;
S.H. Hur
4Chung Nock Environmental Engineering Co. Ltd, Yoido-dong 36-2, Youngdeugpo-ku, Seoul, 150-010, Korea (E-mail: chnock@korea.com)
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T.J. Park
T.J. Park
5Department of Environmental Engineering, Pusan National University, Busan, 609-735, Korea (E-mail: taejoo@pusan.ac.kr)
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Water Sci Technol (2004) 49 (5-6): 245–249.
Citation
H.U. Nam, Y.O. Kim, J.H. Lee, S.H. Hur, T.J. Park; Automatic control of external carbon source addition for nitrogen removal in sewage with low C/N ratios. Water Sci Technol 1 March 2004; 49 (5-6): 245–249. doi: https://doi.org/10.2166/wst.2004.0760
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