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Evaluation of Affecting Factors for Refractory Organics Accumulated in the Lakes  

Kim, Sungwon (Department of Social and Environmental System Engineering, Korea University)
Kim, Geonha (Department of Civil and Environmental Engineering, Hannam University)
Choi, Euiso (Department of Social and Environmental System Engineering, Korea University)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.4, 2006 , pp. 720-726 More about this Journal
Abstract
Long-term monitoring results of water qualities at major lakes in Korea showed COD (chemical oxygen demand) concentrations have been increasing while BOD (biochemical oxygen demand) concentrations have been decreasing during last decades. This was mainly due to refractory organic matters have been accumulated in the water body. In this study, the possible causes of COD concentration increase were evaluated. From the statistics, it can be understood that potent pollutant sources including fertilizer consumption, population, livestock, and carbon uptake have increased. Leaching tests were carried out with soils and biomasses sampled at agricultural-forestry area. From the leaching experiments, leachate qualities as a ratio of $COD_{Cr}/BOD$ were in the range of 2.5-5.0, implying that NOM (natural organic matters) discharged from the forestry area was mainly responsible for the COD accumulation. It can be understood from this research that diffuse pollutants from forestry areas should be controlled properly to reduce COD accumulation in the lakes.
Keywords
Biomass residues; Diffuse sources; Lake; Refractory organics; Reservoir;
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