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The low release rate of soluble phosphorus is due to the existing environmental conditions in the river

Sediment characteristics, phosphorus types and phosphorus release rates between river and lake sediments.

Chemosphere, no. 1 (2003): 53-61

被引用310|浏览6
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摘要

The Han river is 469.7 km long with 26219-km2 area watershed, and is the primary drinking water source for the 20 million people that live in Seoul, Kangwon-Do and Kyunggi-Do, Korea. Phosphorus release from sediments impacts water quality, and is endangering the beneficial use of the river. This research measures phosphorus release and pr...更多

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重点内容
  • Various pollutants may be adsorbed to the sediments accumulated on the bottom of rivers or lakes
  • The size distribution is important because smaller particles have greater specific surface area for pollutant adsorption (Das, 1990)
  • The sediments are classified as Silty Clay in the Jamsil submerged dam (JSD) area
  • Large amounts of phosphorus originating from point and non-point sources exist in the sediments
  • Additional rate studies are needed to determine the release rates at short exposures, which may be significant compared to the current phosphorus load
  • The low release rate of soluble phosphorus is due to the existing environmental conditions in the river
方法
  • The JSD area is a sensitive area because it is the primary source of drinking water for Seoul.
  • This area is called ‘‘Jamsil Submerged dam area’’ because a submerged weir maintains minimum water level, and prevents back mixing from the lower sections of the river.
  • Sediment depth is approximately 1.5–2 m around fish farms, and 0.5–1 m for other areas (Kim and Choi, 1996)
结果
  • Results and discussion

    Fig. 2 shows sediment particle distributions for JSD and CPL areas.
  • The size distribution is important because smaller particles have greater specific surface area for pollutant adsorption (Das, 1990).
  • The means are different at the 99% level of confidence in all cases.
  • This was expected because of the greater pollutant inputs to the JSD area than the CPL area.
  • The smaller particle sizes in the JSD area should increase pollutant accumulation in sediment layers
结论
  • This investigation evaluated the mass, composition and release rates of phosphorous-laden sediments in the JSD and CPL areas of the Han river.
  • The release rate, as measured in laboratory reactors with long exposures, is low, as compared to the current TP load in the river.
  • The low release rate of soluble phosphorus is due to the existing environmental conditions in the river.
  • If conditions such as pH or DO change, the release rate could increase by as much as five times.
  • Ignition loss is the only exception; average ignition loss of CPL sediments is 8% as compared to 6% in JSD sediments
总结
  • Introduction:

    Various pollutants may be adsorbed to the sediments accumulated on the bottom of rivers or lakes
  • These sediments may accumulate over long periods and can act as new pollutant sources to the overlying water many years after the water quality has improved (Lijklema et al, 1993; Masunaga et al, 1993; Abrams and Jarrell, 1995).
  • It is believed that controlling phosphorus is the best approach to reducing eutrophication (Boers and Vanhese, 1988; Dahl et al, 1993)
  • Methods:

    The JSD area is a sensitive area because it is the primary source of drinking water for Seoul.
  • This area is called ‘‘Jamsil Submerged dam area’’ because a submerged weir maintains minimum water level, and prevents back mixing from the lower sections of the river.
  • Sediment depth is approximately 1.5–2 m around fish farms, and 0.5–1 m for other areas (Kim and Choi, 1996)
  • Results:

    Results and discussion

    Fig. 2 shows sediment particle distributions for JSD and CPL areas.
  • The size distribution is important because smaller particles have greater specific surface area for pollutant adsorption (Das, 1990).
  • The means are different at the 99% level of confidence in all cases.
  • This was expected because of the greater pollutant inputs to the JSD area than the CPL area.
  • The smaller particle sizes in the JSD area should increase pollutant accumulation in sediment layers
  • Conclusion:

    This investigation evaluated the mass, composition and release rates of phosphorous-laden sediments in the JSD and CPL areas of the Han river.
  • The release rate, as measured in laboratory reactors with long exposures, is low, as compared to the current TP load in the river.
  • The low release rate of soluble phosphorus is due to the existing environmental conditions in the river.
  • If conditions such as pH or DO change, the release rate could increase by as much as five times.
  • Ignition loss is the only exception; average ignition loss of CPL sediments is 8% as compared to 6% in JSD sediments
表格
  • Table1: Pollutant concentrations in JSD and CPL sediments
  • Table2: Average phosphorus existence types of sediment
Download tables as Excel
基金
  • The project was funded by the Korea Engineering Consultants Corporation (KECC) and city of Seoul, Korea
研究对象与分析
undisturbed samples with sediment depth: 45
Concentration versus depth. Fig. 3 shows analysis results of the 45 undisturbed samples with sediment depth. Pollutant concentrations increase with sediment depth in the JSD area

引用论文
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