| Title |
Effect of Filtration Rate and Influent Concentration on Denitrifying Sand Filter |
| Authors |
민경석(Kyung Sok Min),정용준(Yong Jun Jung) |
| Abstract |
The objectives of this study were to investigate the process performance of a bench-scale denitrifying sand filter like maximum filtration rate and effluent concentration with the variation of influent quality and to estimate its applicability for the add-on treatment process of BNR effluent polishing. During the whole experimental periods, SS, Turbidity and NO₃^--N concentration of effluent were obtained less than 2.5 ㎎/L, 2.5 NTU and 6.3 ㎎/L, respectively. The removal efficiency of NO₃^--N could be gradually increased from 78% to 91% by varing the requirements of theoretical external carbon source, which was in the range of 80% and 100%. In both cases that influent NO₃^--N was ranged from 10 to 15 ㎎/L at the filtration rate of 151.3∼171.1 m/d and NO₃^--N was 28.2 ㎎/L at the rate of 111.8 m/d, the NO₃^--N removal efficiencies were 78%, respectively. It is noticed that influent concentration of NO₃^--N was an important factor for NO₃^--N removal efficiency as well as filtration rate. Regardless of influent concentration and filatration rate, SS and Turbidity were less than 2.5 ㎎/L and 2.5 NTU, respectively. Therefore denitrifying sand filter could be of use an alternative post denitrification process targeting for the removal of SS as well as nitrogen. |