Carbon Dioxide Injection Method for Enhancing Hydrogenotrophic Denitrification of Secondary Wastewater Effluent in Fixed Bed Reactor
- Carbon Dioxide Injection Method for Enhancing Hydrogenotrophic Denitrification of Secondary Wastewater Effluent in Fixed Bed Reactor
- 박기영; 맹승규; 안규홍; 이광형; 최오경; 이재우
- hydrogenotrophic denitrification; fixed bed reactor (FBR); carbon dioxide; periodic injection; nitrite accumulation; pH
- Issue Date
- Biotechnology and bioprocess engineering
- VOL 18, NO 2, 326-332
- 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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