| Title |
A Study on an Estimation of the Nutrient Removal Potential of Aquatic Plants in Natural Streams |
| Authors |
신정이(Shin Joung Yi),박석순(Seok Soon Park) |
| Abstract |
This paper presents the results from a study on the nutrient removal potential of aquatic plants. Phragmites japonica and Salix gracilistyla, which are dominant species in riparian zone of the Suip Stream, a tributary of the North Branch of Han River. Both plants were obtained from the field survey and hydrocultured in a laboratory aquarium specially designed for this experiment after short period of acclimination. The nutrient removal potentials of both plants were determined as a functions of hydraulic retention time as well as influent nutrient concentrations. The nutrients include ammonia-nitrogen, nitrate-nitrogen, and dissolved inorganic phosphorus. Based on the results of determined removal potential and in-situ biomass, removal capacity was estimated in the reach of 6 km in the Suip Stream. The nutrient removal potentials of both plants were significantly affected by hydraulic retention time and inflow concentration. The potential was much higher at short period of hydrualic retention time and high concentrations of nutrient. The removal potential of Phragmites japonica is much higher than that of Salix gracilistyla. Multiple regression was performed to describe the removal potential as a function of hydraulic retention time and influent nutrient concentration. From this study, it was estimated that ammonia-nitrogen of 0.8∼22.3 ㎏/day, nitrate-nitrogen of 12.9∼577.2 ㎏/day, and dissolved inorganic phosphorus of 11.4∼38.6 ㎏/day, would be removed by both plants in the study reach of the Suip Stream. Since this study did not include removal effect by soil micro-organisms, the removed amounts of all three nutrients in real system would be much higher than those determined in this study. |