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KMID : 1094720130180020326
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Biotechnology and Bioprocess Engineering
2013 Volume.18 No. 2 p.326 ~ p.332
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Carbon dioxide injection method for enhancing hydrogenotrophic denitrification of secondary wastewater effluent in fixed bed reactor
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Park Ki-Young
Maeng Sung-Kyu
Ahn Kyu-Hong
Lee Kwan-Hyoung
Choi Oh-Kyung
Lee Jae-Woo
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Abstract
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This study presents an optimal injection method for using carbon dioxide as a carbon source for the hydrogenotrophic denitrification of secondary wastewater effluent in a laboratory-scale fixed bed reactor (FBR). The FBR was operated under three conditions: a continuous CO2 supply, periodic CO2 supply, and without a CO2 supply. The continuous operation of the FBR without carbon dioxide injection resulted in an increase in pH to 10 and a noticeable level of nitrite accumulation. The continuous co-injection of carbon dioxide and hydrogen gas decreased the pH to a range of 6 ∼ 8, but the denitrification efficiency decreased to 29%. The co-injection of carbon dioxide decreased the maximum dissolved hydrogen concentration and hydrogen mass transfer rate by 25 and 61%, respectively. Compared to the continuous injection method, a periodic injection of carbon dioxide increased the denitrification efficiency from 28.6 to 85% as the hydrogen flow rate and hydraulic retention time (HRT) increased. With the periodic injection of carbon dioxide, the nitrite accumulation appeared to be insignificant as the hydrogen flow rate increased.
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KEYWORD
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hydrogenotrophic denitrification, fixed bed reactor (FBR), carbon dioxide, periodic injection, nitrite accumulation, pH
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