갈대 및 부들 습지셀의 연못시스템 방류수 질소제거 비교

Abstract

NO3-N and T-N removal rates of cattail wetland cells were compared with those of reed wet- land cells. The examined cells were a part of a pond-wetland system composed of two ponds in series and six wetland cells in parallel. Each wetland cell was 25 m in length and 6 m in width. Cattails (Typha angu- stifolia) were transplanted into three cells and reeds (Phragmites australis) into another three ones in June 2000. Water of Sinyang stream flowing into Kohung Estuarine lake located in the southern part of the Korean Peninsula was pumped into the primary pond, its effluent was discharged into the secondary pond. Effluent from the secondary pond was funneled into each cell. Two cattail and reed cells were chosen for this research. Water quantity and quality of influnt and effluent were analyzed from May 2001 through October 2001. The volume of influent and effluent of the cells averaged about 20.0 m3/day and 19.3 m3/day, respectively. Hydraulic retention time was approximately 1.5 days. Influent NO3-N concentration for the four cells averaged 2.39 mg/L. Effluent NO3-N concentration for the cattail and reed cells averaged 1.74 and 1.78 mg/L, respectively. Average NO3-N retention rate for the cattail and reed cells by mass was 30 and 29%, respectively. Influent T-N concentration for the four cells averaged 4.13 mg/L. Effluent T-N concentration for the cattail and reed cells averaged 2.55 and 2.61 mg/L, respectively. Average T-N retention rate for the cattail and reed cells by mass was 39 and 38%, respectively. NO3-N and T-N concentrations in effluent from the cattail cells were significantly low (p = 0.04), compared with those from the reed cells. Cattail wetland cells were more efficient for NO3-N and T-N abatement than reed ones.