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김호섭 ( Ho-sub Kima ),박윤희 ( Yun-hee Park ),김용삼 ( Yong-sam Kim ),김상용 ( Sang-yong Kim ) 한국물환경학회(구 한국수질보전학회) 2018 한국물환경학회지 Vol.34 No.5
The purpose of this study was to understand distribution characteristics of organic matters through concentration of BOD<sub>5</sub>, COD<sub>Mn</sub> and TOC in 31 streams in Han River region, and to establish the relationship among organic matter concentration, and discharge load and flow rate. Concentration of BOD<sub>5</sub> and TOC in 22 streams were above IV grade except 9, and the average 80.9 % of total organic matter (by TOC) accounted for dissolved organic type. Correlation among organic matter parameters were higher (r2 > 0.78) and the relationship between TOC and COD<sub>Mn</sub> concentration was higher than BOD<sub>5</sub>. Ratio of biodegradable organic matter/total organic matter in the 31 streams was estimated at 41.4 % with BOD<sub>5</sub> oxidation rate, and 78.0 % with BOD<sub>5</sub>/COD<sub>Mn</sub> concentration ratio. Ratio of NBOD/BOD<sub>5</sub> concentration in four sites with BOD<sub>5</sub>/COD<sub>Mn</sub> concentration ratio exceeding 1 ranged from 54.5 % ~ 79.3 %. Among 979 flow rate data measured at 31 streams, 87 % of measured data was below 0.1 cms and increased water pollution under low flow conditions. Correlation between BOD<sub>5</sub> concentration and BOD<sub>5</sub> discharge load in the watershed was low, and it was revealed that several streams have more BOD<sub>5</sub> delivery load than BOD<sub>5</sub> discharge load. Results suggest that many biodegradable forms of organic matter are being introduced into the stream from pollutant sources in the watershed.
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