Park, Ki Young Maeng, Sung Kyu Ahn, Kyu-Hong Lee, Kwanhyoung Choi, Oh Kyung Lee, Jae Woo 2024-01-20T12:33:32Z 2024-01-20T12:33:32Z 2021-09-05 2013-04 1226-8372 https://pubs.kist.re.kr/handle/201004/128203 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 similar to 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. English KOREAN SOC BIOTECHNOLOGY & BIOENGINEERING AUTOTROPHIC DENITRIFICATION DEPENDENT DENITRIFICATION PHOSPHORUS REMOVAL NITRATE TEMPERATURE GROUNDWATER KINETICS GROWTH GAS PH Carbon dioxide injection method for enhancing hydrogenotrophic denitrification of secondary wastewater effluent in fixed bed reactor Article 10.1007/s12257-012-0537-9 1 BIOTECHNOLOGY AND BIOPROCESS ENGINEERING, v.18, no.2, pp.326 - 332 BIOTECHNOLOGY AND BIOPROCESS ENGINEERING 18 2 326 332 scie scopus kci ART001767776 000318863900014 2-s2.0-84877790441 Biotechnology & Applied Microbiology Biotechnology & Applied Microbiology Article AUTOTROPHIC DENITRIFICATION DEPENDENT DENITRIFICATION PHOSPHORUS REMOVAL NITRATE TEMPERATURE GROUNDWATER KINETICS GROWTH GAS PH hydrogenotrophic denitrification fixed bed reactor (FBR) carbon dioxide periodic injection nitrite accumulation pH