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KMID : 0545120000100030410
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Journal of Microbiology and Biotechnology
2000 Volume.10 No. 3 p.410 ~ p.414
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Denitrification Characteristics and Microorganism Composition of Acclimated Denitrifier Consortium
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Park, Eun Ju
Seo, Jae Koan/Kim, Joong Kyun/Suh, Kuen Hack/Kim, Sung Koo
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Abstract
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The effect of the COD/N ratio on denitrifcation characteristics was evaluated for the development of a denitrification process. Activated sludge, acclimated to an anoxic condition, was used as the denitrifier consortium (mixture of denitrifying organisms) for enhanced nitrogen removal in a recirculating aquarium system. Synthetic wastewater containing nitrate was used as the influent solution and glucose was used as the carbon source for denitrification. The COD/N ratio varied within a range of 1.5-7.2. The denitrification efficiency was higher than 97% even at a COD/N ratio of 1.5. Under a theoretical COD/N ratio of 3.0, nitrite was detected, however, the amount was less than 1% of the total influent nitrogen. The number of both nitrate-reducing bacteria and denitrifying bacteria reached 3.5×10 exp (5)/㎖ with a COD/N ratio of 1.5 after 45 days of operation.
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