| Title |
A Study on Seasonal Nitrogen Treatment Characteristics according to Design of Constructed Wetland |
| Authors |
손영권 ( Yeong Kwon Son ) ; 윤춘경 ( Chun Gyeong Yoon ) ; 김준식 ( Jun Sik Kim ) ; 김형중 ( Hyung Joong Kim ) |
| Keywords |
Constructed wetland; Denitrification; Nitrogen removal; Seasonal performance; Wetland design |
| Abstract |
The performance data for eight years from a free-surface-flow constructed wetland system receiving agricultural tailwater were used to analyze denitrification rate and nitrogen treatment characteristics according to season and wetland design. Seasonal difference between growing season (March~November) and winter season (December~February) was shown in the concentration of all nitrogen species. Seasonal nitrogen treatment has similar trend with temperature and measured denitrification rate. The highest denitrification rate was measured in July, but treatment efficiency was most higher in May and June. Nitrogen absorption of vegetation could affect to these wetland performances, therefore dense population of wetland vegetation might be helpful. According to design of wetland, at least 25~50 m of wetland length was needed to decrease effluent T-N concentration to background concentration in growing season. In winter season, wetland needed much longer distance to reduce T-N concentration. Mass removal rate was continuously high through whole year because runoff coefficient was low in winter season. Applicability of constructed wetland was observed for the total maximum daily load that control T-N load. |