| Title |
Water Quality Improvement of a Small Reservoir by the Operation of Air - lifters |
| Authors |
전항배 ; 김학성 ; 이태용 ( Hang Bae Jun ; Hag Seong Kim ; Tae Young Lee ) |
| Abstract |
Yeoncho dam, a small reservoir for industry and domestic water supply, located at Geoje island in the southern part of Korean peninsula was constructed and have been operated since 1979. Odor and taste problem was occurred 2 years after the initiation of storage of water. For the improvement of water quality, forced circulation of water throughout the reservoir was made by using a 5 air-lifters. In this study, the influences of air-lifters operation on the water quality control were investigated by monitoring physicochemical and biological factors. Operation of air-lifters removed odor and taste completely since 1992. During the first year(1992) operation, however, there was evidences of occurrence of algal bloom in spring and autumn due to the turnover of the reservoir, while no significant variations in water quality were detected in 1993. Odor and taste in this case seems to be originated from anaerobic decomposition of benthic decompositions and from algal growth. The forced circulation supplied DO to the bottom layer of the reservoir and prevented the layer from anaerobic condition. Total nitrogen showed apparent decrease right after the start-up of the air-lifters, while total phosphorus(T-P) and Chlorophyll-a showed very high concentrates in the early 1992. The last two parameters were still high even after 1993, however, they showed a tendency of gradual decrease as the operation time prolonged. |