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Determination of the Optimum NH$_3$-N/NO$_2$-N Ratio by Anaerobic Batch Test in Anaerobic Ammonium Oxidation Process  

Lee, Hwan-Hee (Center for Environmental Technology Research, KIST)
Kim, I-Jung (Center for Environmental Technology Research, KIST)
Jung, Jin-Young (Center for Environmental Technology Research, KIST)
Kim, Jee-Hyung (Department of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.30, no.7, 2008 , pp. 700-704 More about this Journal
Abstract
Nitrite and free ammonia have been known as substrate inhibitors in anaerobic ammonium oxidation. To reduce inhibitory effect of these substrates, the NH$_3$-N/NO$_2$-N ratio in the influent could be properly controlled in anaerobic ammonium oxidation process. Five kinds of NH$_3$-N/NO$_2$-N ratio were assayed in batch to find optimum NH$_3$-N/NO$_2$-N ratio, curtailing substrate inhibition. As the results of batch test, the highest T-N removal efficiency of 88% was obtained at 1.00 : 1.30 of NH$_3$-N/NO$_2$-N ratio. In addition, rate constants for ammonium and nitrite in zero-order kinetics were found to be the highest values as 7.66 mg/L$\cdot$hr and 11.89 mg/L$\cdot$hr at 1.00 : 1.30 ratio, respectively. However, as for the specific anammox activity, the ratio of NH$_3$-N/NO$_2$-N ratio was recommended as 1 : 1.15 which can maintain the highest SAA during continuous operation and preclude the accumulation of nitrite in the reactor.
Keywords
Anaerobic Ammonium Oxidation; Ammonium Nitrogen to Nitrite Nitrogen Ratio; Inhibitor; Anaerobic Batch Test; Specific Anammox Activity;
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