| Title |
The Distribution Characteristics of Organic Matters in the Contaminated Tributaries of Han River Region |
| Authors |
김호섭 ( Ho-sub Kima ) ; 박윤희 ( Yun-hee Park ) ; 김용삼 ( Yong-sam Kim ) ; 김상용 ( Sang-yong Kim ) |
| DOI |
https://doi.org/10.15681/KSWE.2018.34.5.494 |
| Keywords |
Biodegradable organic matter; BOD5 oxidation rate; Delivery load; Discharge load; Flow rate |
| Abstract |
The purpose of this study was to understand distribution characteristics of organic matters through concentration of BOD5, CODMn 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 BOD5 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 CODMn concentration was higher than BOD5. Ratio of biodegradable organic matter/total organic matter in the 31 streams was estimated at 41.4 % with BOD5 oxidation rate, and 78.0 % with BOD5/CODMn concentration ratio. Ratio of NBOD/BOD5 concentration in four sites with BOD5/CODMn 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 BOD5 concentration and BOD5 discharge load in the watershed was low, and it was revealed that several streams have more BOD5 delivery load than BOD5 discharge load. Results suggest that many biodegradable forms of organic matter are being introduced into the stream from pollutant sources in the watershed. |