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수중폭기장치에 의한 용수전용댐의 수층파괴 및 수질개선에 대한 연구
전항배,김학성,이태용 ( Hang Bae Jun,Hag Seong Kim,Tae Young Lee ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.2
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.
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전항배,손광익,이태용,한경전 대한상하수도학회 1995 상하수도학회지 Vol.9 No.4
An improving example for traditional rapid mix system was studied in the base of mechanisms of alum coagulation. Local status of the major water treatment plants was also investigated and evaluated for upgrading these plants. A new design and operating criterium for rapid mix system was proposed to velocity gradient, G of 1,000-1,500 sec^-1 and detention time, t of 1 sec from the results of experiments and literature reviews. Comparing the present rapid mix system to this criterium, apparent difference existed between them. In this study, for improving Seongnam water treatment plant, a design criterium of velocity gradient, and detention time was set to 1,100 sec^-1, 1 sec, respectively. A new rapid mix system adopted the nozzle injection countcurrently cross the inlet pipe to the whole area. The injection velocity was 17m/s, nozzle diameter was 1.0mm, and number of nozzle was 70. The new modified system without running present four 75 HP agitators was able to improve water quality(based on sedimentation effluent) by 15-35% and to reduce electrical energy by 98%.
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