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KMID : 1024520150240111343
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Journal of the Environmental Sciences
2015 Volume.24 No. 11 p.1343 ~ p.1362
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Temporal and Spatial Analysis of Non-biodegradable Organic Pollutants in the Geumho River System
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Jung Kang-Young
Ahn Jung-Min
Lee Kyung-Lak
Lee In-Jung
Yu Jay-Jung
Cheon Se-Uk
Kim Kyo-Sik
Han Kun-Yeun
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Abstract
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As a result of analysis based on the observed data for BOD, COD and TOC in order to manage non-biodegradable organics in the Geumho River, COD/BOD ratio was analyzed as the occupying predominance proportion. In this study, the
classification(changes in water quality measurement : increase, equal, decrease) and measurement of BOD and COD were analyzed for trends over the past 10 years from 2005 to 2014 in the Geumho River. The Geumho River is expected to need non-biodegradable organics management because BOD was found to be reduced 61.1% and COD was found to be increased 50%. As a result of the analysis of land use, the Geumho-A is a unit watershed area of 921.13 km2
, which is the most common area that is occupied by forests. The Geumho-B is a unit watershed area of 436.8 km2, which is the area that is highest occupied by agriculture and grass of 24.84%. The Geumho-C is a unit watershed area of 704.56 km2 accounted for 40.29% of the entire watershed, which is the area that is occupied by urban of 15.12%. Load of non-biodegradable organics, which is not easy biodegradable according to the discharge, appeared to be increased because flow coefficient of COD and TOC at the Geumho-B were estimated larger than 1 value. The management of non-point sources of agricultural land is required because the Geumho-B watershed area occupied by the high proportion of agriculture and field. In this segment it showed to increase the organics that biodegradation is difficult because the ratio of BOD and TOC was decreased rapidly from GR7 to GR8. Thus,countermeasures will be required for this.
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KEYWORD
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Geumho River, TMDL, BOD, COD, TOC, Water quality
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