| Title |
Ammonia Oxidation by Ozone in Presence of Bromide Ion |
| Authors |
이현동 ; 종궁공 (宗宮功) ; 이의신 ( Hyun Dong Lee ; Isao Somia ; Eui Sin Lee ) |
| Abstract |
This study was conducted in order to elucidate basic conditions for the oxidation of ammonia-nitrogen with ozone in bromide containing water. The denitrification rates were observed under the batch and the continuous types at various concentrations of Br, initial pH and ozone dosages. The result showed that the oxidation reaction of ammonia-nitrogen with ozone was not occurred in the presence of BrO₃, but denitrification and nitrification took place in the presence of Br. This implies that OBr functioned as the oxidant for the oxidation of ammonia-nitrogen. The reaction rate of denitrification was quasi Zero-order with respect to dissolved nitrogen compound concentration and the reaction rate constant, K can be expressed in terms of ［Br］ and ［O₃］: K=0.023 ［O₃］·［1-10 ^(m [Br])］ The initial pH effect on denitrification rate was not significant in the range of pH 5.6∼10 but the removal rate was low at pH 3 presumably due to the retardation of OBr production under the low pH condition. Also with raising Br concentration, nitrification rate decreased but with raising initial pH, denitrification rate increased because ozone can react with NH₄ at fast rate. The denitrification kinetics obtained from batch experiment was used and applied to the continuous type process. |