Due to the rapid industrialization and urbanization, input loading of pollutants to the coast and ocean is increasing steadily. Even though various methods are applied to improve the quality of both sea water and sediment, they also usually lead to second pollution and/or require enormous cost. Ther...
Due to the rapid industrialization and urbanization, input loading of pollutants to the coast and ocean is increasing steadily. Even though various methods are applied to improve the quality of both sea water and sediment, they also usually lead to second pollution and/or require enormous cost. Therefore more economical and eco-friendly technologies should be investigated for conservation and reclamation of polluted coastal area. In this research, water quality improvement in stagnant sea area using solar water circulation apparatus was studied. This apparatus forces the water of surface layer moving to radial direction that is followed by upcoming water flow from the bottom through intake hose. The energy required to operate the brushless motor that drives impellers is supplied by the solar panels, and the apparatus is floating by buoyant tripods. A solar water circulation apparatus was installed in Buk bay in Tongyeong and its applicability to destruct the stratification and to improve water quality through oxygenation was verified. At the beginning of the operating of the apparatus, water temperature was 27.9℃ and 23.8℃ in surface layer and bottom layer, respectively. And dissolved oxygen concentration was 5.49 mg/L, 2.61 mg/L, respectively and these data showed that there was a stratification in this area. After 8 weeks, water temperature in both surface and bottom layer was same in 22.1℃, and dissolved oxygen concentration was 6.45 mg/L in surface layer and 6.19 mg/L in bottom layer, respectively. From temporal variation of water temperature and DO concentration, we could conclude that surface water and bottom water were well mixed and high DO concentration were transferred to the bottom layer as well as the stratification was destroyed. Nutrients composition was also changed after the operating of the apparatus. In case of PO4-P, initial concentration in surface and bottom was 0.325 mg·P/L, 0.268 mg·P/L, respectively, and final concentration dramatically decreased to 0.021 mg·P/L, 0.031 mg·P/L, respectively. DIN also decreased from 0.135 mg·N/L to 0.050 mg·N/L in surface layer.
Due to the rapid industrialization and urbanization, input loading of pollutants to the coast and ocean is increasing steadily. Even though various methods are applied to improve the quality of both sea water and sediment, they also usually lead to second pollution and/or require enormous cost. Therefore more economical and eco-friendly technologies should be investigated for conservation and reclamation of polluted coastal area. In this research, water quality improvement in stagnant sea area using solar water circulation apparatus was studied. This apparatus forces the water of surface layer moving to radial direction that is followed by upcoming water flow from the bottom through intake hose. The energy required to operate the brushless motor that drives impellers is supplied by the solar panels, and the apparatus is floating by buoyant tripods. A solar water circulation apparatus was installed in Buk bay in Tongyeong and its applicability to destruct the stratification and to improve water quality through oxygenation was verified. At the beginning of the operating of the apparatus, water temperature was 27.9℃ and 23.8℃ in surface layer and bottom layer, respectively. And dissolved oxygen concentration was 5.49 mg/L, 2.61 mg/L, respectively and these data showed that there was a stratification in this area. After 8 weeks, water temperature in both surface and bottom layer was same in 22.1℃, and dissolved oxygen concentration was 6.45 mg/L in surface layer and 6.19 mg/L in bottom layer, respectively. From temporal variation of water temperature and DO concentration, we could conclude that surface water and bottom water were well mixed and high DO concentration were transferred to the bottom layer as well as the stratification was destroyed. Nutrients composition was also changed after the operating of the apparatus. In case of PO4-P, initial concentration in surface and bottom was 0.325 mg·P/L, 0.268 mg·P/L, respectively, and final concentration dramatically decreased to 0.021 mg·P/L, 0.031 mg·P/L, respectively. DIN also decreased from 0.135 mg·N/L to 0.050 mg·N/L in surface layer.
주제어
#Water circulation apparatus Solar energy Semi-closed sea Stagnant sea area Stratification
학위논문 정보
저자
김덕길
학위수여기관
경상대학교 대학원
학위구분
국내석사
학과
해양환경공학과 해양환경공학전공
지도교수
최광수
발행연도
2012
총페이지
52 p.
키워드
Water circulation apparatus Solar energy Semi-closed sea Stagnant sea area Stratification
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