소하천 자연정화를 위한 고효율습지여상공법의 성능평가 및 개선방안

Performance Evaluation and Improvement of High Effective Wetland for Natural Purification of Small Stream

To recover the polluted river and the damaged river ecosystem. High Effective Wetland is used in Chungnam Kumsan-gun, Chubu-meon, Chupoong River. Based on the survey of the High Effective Wetland. its treatment performance was estimated and the problems were analyzed. The average removal performances of BOD, COD and SS are 51.1%, 37.6% and 57.3%, respectively, which are lower than the expected rates BOD 65% and SS 70%. While the nitrogen removal efficiency rates are 17.1%, which are not high enough either. Because of the aquatic plant didn't grow up well. In rainy season, the removeal efficiency rates of BOD, COD, SS and TN were lower than those of dry season as 32.5%, 34.3%, 78.2% and 17.6%, respectively. Impeovement of stream water quality in low less than about 14% as BOD. In addition, the inlet of the wetland was often blocked by the floating matters, which resulted in only about 30% of the river flow entered the wetland, led to the poor performance. It is necessary to improve the inlet condition, so that more stream water can enter wetland. To improve its treatrnent effective, observation the growth of aquatic plants and improvement of the growth conditions are required.