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Influence of Ammonia and Dissolved Oxygen Concentrations on Nitrite Accumulation in a MBR  

Choi, In-Su (Department of Environment Engineering, University of Seoul)
Wiesmann, Udo (Department of Environment Engineering, Faculty III. TU Berlin, Germany)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.8, 2007 , pp. 922-929 More about this Journal
Abstract
The complete oxidation of ammonia to nitrate is a distinctive two-step process divided into the oxidation of ammonia to nitrite(nitritation) by Nitrosomonas and the oxidation of nitrite to nitrate(nitratation) by Nitrobacter. The nitrogen removal via nitrite accumulation offers several advantages such as saving costs for aeration, saving carbon source and finally reduction of sludge discharge. In this work a suspended bioreactor coupled with membrane filtration(MBR) was used to find the process conditions of nitrite build-up. The MBR enables to reach sufficient nitrifying bacteria in the bioreactor, although the autotrophic bacteria can be easily washed out due to their lower growth rate. The dissolved oxygen concentration $c and ammonia concentration $c_{NH3}$ in the reactor were varied and investigated as parameters for nitrite accumulation. As a result the higher ammonia concentration in the reactor is very effective for starting nitrite build-up and the effect was strengthened in combination with lower dissolved oxygen concentration. With lower $c'_{O2}<0.3$ $mgL^{-1}$ $O_2$ and high $c_{NH3}=6.3\sim14.9$ $mgL^{-1}$ $NH_3N$ the 74% of the nitrite accumulation was achieved. Specially, it was found that the nitrite accumulation could occur not only in biofilm reactor as many references showed but also in the membrane bioreactor carried out in this study.
Keywords
Nitrogen Removal; Partial Nitrification; Nitrite Build-up; Nitrite Accumulation; MBR;
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