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KMID : 0380020040190020154
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Korean Journal of Biotechnology and Bioengineering
2004 Volume.19 No. 2 p.154 ~ p.158
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Recycled packed-bed reactor for efficient denitrification
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Kim Sung-Hong
Song Seung-Hoon
Park Jae-Yeon
Yoo Young-Je
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Abstract
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Recycled packed-bed reactor emploring immobilized microorganism was suggested in this paper for efficient denitrification. In the batch reactor, the effects of initial oxidation-reduction potential and nitrate concentration on denitrification were investigated. As the initial oxidation-reduction potential was decresed to -70 mV from ＋40 mV, the removal rate of nitrate was increased to 3.33 from 1.25 m9 NO-/-N/min under the experimental conditions. As the initial nitrate-N concentraion was increased to 200 mg/l, the removal rate of nitrate was proportional to the concentration of nitrate. When the concentration of nitrate-N was 400 mg/min, nitrite was detected, and when the initial nitrate-N concentration was reached at 1,000 mg/l, it took longer time for the complete nitrate removal. In order to decrease the initial oxidation-reduction potential and the nitrate-N concentration in the feed stream, the effluent was recycled to the influent stream in the packed-bed reactor. In the case of recycling, the initial oxidation-reduction potential was decreased to 30 mV from 150 mV, and the initial nitrate concentration could be decreased to 85 from 120 mg NO-/-N/l. As the result of recycling, the removal rate of nitrate was increased to 91.7% from 49.2%.
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KEYWORD
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Oxidation-reduction potential, packed-bed reactor, nitrate removal, nitrate reductase, wastewater treatment
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