Long-term variations in water quality in the lower Han River
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초록
The Han River is the main water resource for the Seoul metropolitan area (Korea) with twenty million people relying on it, and its eutrophication is of great concern for preserving drinking water quality. In this study, long-term trends in biological oxygen demand (BOD), chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), and suspended solids at a downstream site of the river (St. Gui) are presented from 1989 to 2006 using data from the Ministry of the Environment. Longitudinal distributions in TP, TN, and chlorophyll-a concentration were measured in the downstream reaches between the Paldang Dam and Haengju Bridge. The long-term average BOD was 1.82 ± 0.67 mg/L and showed a decreasing trend, whereas COD did not vary consistently with a long-term average of 3.46 ± 0.87 mg/L, and consequently, the BOD/COD ratio decreased. This pattern can be interpreted as an increasing trend in the nonbiodegradable organic matter/biodegradable organic matter ratio, which can be attributed to enhanced sewage treatment. The long-term record for concentration did not show a consistent delate trend, whereas the seasonal variation was remarkably large with high concentrations during the flood season. In contrast, phytoplankton density was higher during low-flow seasons. It seemed that hydraulic residence time was the major factor controlling phytoplankton, as is typical in a lotic environment, which overwhelmed the effects of other factors such as temperature, nutrients, and solar radiation. In conclusion, BOD has decreased in the lower Han River system, but nonbiodegradable organic matter and phosphorus concentrations have not decreased.
Abstract
The Han River is the main water resource for the Seoul metropolitan area (Korea) with twenty million people relying on it, and its eutrophication is of great concern for preserving drinking water quality. In this study, long-term trends in biological oxygen demand (BOD), chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), and suspended solids at a downstream site of the river (St. Gui) are presented from 1989 to 2006 using data from the Ministry of the Environment. Longitudinal distributions in TP, TN, and chlorophyll-a concentration were measured in the downstream reaches between the Paldang Dam and Haengju Bridge. The long-term average BOD was 1.82 ± 0.67 mg/L and showed a decreasing trend, whereas COD did not vary consistently with a long-term average of 3.46 ± 0.87 mg/L, and consequently, the BOD/COD ratio decreased. This pattern can be interpreted as an increasing trend in the nonbiodegradable organic matter/biodegradable organic matter ratio, which can be attributed to enhanced sewage treatment. The long-term record for concentration did not show a consistent delate trend, whereas the seasonal variation was remarkably large with high concentrations during the flood season. In contrast, phytoplankton density was higher during low-flow seasons. It seemed that hydraulic residence time was the major factor controlling phytoplankton, as is typical in a lotic environment, which overwhelmed the effects of other factors such as temperature, nutrients, and solar radiation. In conclusion, BOD has decreased in the lower Han River system, but nonbiodegradable organic matter and phosphorus concentrations have not decreased.
참고문헌 (19)
- Eaton AD, "Standard Methods for the Examination of Water and Wastewater. 18th ed" (1992), American Public Health Association, American Water Works Association, Water Environment Federation
- Chang H, "Spatial analysis of water quality trends in the Han River basin, South Korea", Water Res, 42, pp.3285~3304 (2008)
- Joo GJ, "Long-term trend of the eutrophication of the lower Nakdong River", Korean J Limnol, 30, pp.472~480 (1997)
- Jung YJ, "National pilot projects for management of diffuse pollution in Korea", DESALINATION, 226(1-3), pp.97~105 (2008), ELSEVIER SCIENCE BV
- Kim B, "Eutrophication of reservoirs in South Korea", Limnology, 2, pp.223~229 (2001)
- Kim G, "Diffuse pollution loading from urban stormwater runoff in Daejeon city, Korea", Environ Manag, 85, pp.9~16 (2007)
- "Korea Ministry of Environment"[URL]
- Krasner SW, "Chemistry of disinfection by-product formation In Formation and Control of Disinfection By-products in Drinking Water", pp.27~52 (1999), American Water Works Association
- Krasner SW, "The occurrence of disinfection by-products in US drinking water", J Am Water Works Assoc, 81, pp.41~53 (1989)
- Lee H, "Seasonal first flush phenomenon of urban stormwater discharges", Water Res, 38, pp.4153~4163 (2004)
- 이혜원, "Temporal Analysis of Trends in Dissolved Organic Matter in Han River Water", Environmental Engineering Research, 14(4), pp.256~260 (2009), 대한환경공학회
- White Paper of Environment, "Ministry of Environment", Ministry of Environment, 449~ (2009)
- Nawrocki J, "Ozonation by-products and their analysis", Pol J Environ Stud, 4, pp.5~12 (1995)
- Organisation for Economic Co-operation and Development, "Eutrophication of Waters: Monitoring, Assessment and Control" (1982), Organisation for Economic Co-operation and Development
- Owen DM, "Characterization of Natural Organic Matter and Its Relationship to Treatability" (1993), American Water Works Association
- Reckhow DA, "Chlorination of humic materials: by-product formation and chemical interpretations", Environ Sci Technol, 24, pp.1655~1664 (1990)
- Van Nieuwenhuyse EE, "Phosphorus-chlorophyll relationship in temperate streams and its variation with stream catchment area", Can J Fish Aquat Sci, 53, pp.99~105 (1996)
- Wetzel RG, "Limnology: Lake and River Ecosystems. 3rd ed" (2001), Academic Press
- 양해근, "기후변화에 따른 유역의 물수지 변화", 대한지리학회지, 42(3), pp.405~420 (2007), 대한지리학회