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Deterioration of denitrification by oxygen and cost evaluation of electron donor in an uncovered pre-denitrification process

  • Environmental Engineering
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Abstract

Specific nitrate uptake rates (SNURs) under two test conditions were measured to evaluate effects of oxygen inhibition on denitrification. A test condition was that activated sludge was completely prevented from contacting of oxygen (SNUR closed ), the other was that activated sludge was contacted to free air (SNUR open ). Municipal wastewater and acetate were used as electron donors. SNUR closed was 2.42 mg NO3-N/g VSS-hr and SNUR open was 1.09 mg NO3-N/g VSS-hr when municipal wastewater was used as electron donor. Meanwhile, when acetate was used as electron donor, SNUR closed was 24.65 mg NO3-N/g VSS-hr and SNUR open was 18.00 mg NO3-N/g VSS-hr. The operating costs for electron donors were calculated based on the unit price of acetate to remove nitrate. When municipal wastewater was used as electron donor the ratio of cost open to cost closed was 0.45. Cost evaluation showed the adverse impacts on denitrification and explained why an anoxic reactor should be sequestered from oxygen.

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Authors and Affiliations

  1. Research Division for Industry and Environment, Korea Atomic Energy Research Institute, 1266 Sinjeong, Jeongeup, Jeonbuk, 580-185, Korea

    Seung Joo Lim, Tak-Hyun Kim, Tae-Hun Kim & In Hwan Shin

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  1. Seung Joo Lim
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  2. Tak-Hyun Kim
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  3. Tae-Hun Kim
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  4. In Hwan Shin
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Correspondence to Seung Joo Lim.

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Lim, S.J., Kim, TH., Kim, TH. et al. Deterioration of denitrification by oxygen and cost evaluation of electron donor in an uncovered pre-denitrification process. Korean J. Chem. Eng. 29, 1196–1202 (2012). https://doi.org/10.1007/s11814-012-0004-5

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  • DOI: https://doi.org/10.1007/s11814-012-0004-5

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