영산강 수계 TOC, COD/BOD 특성

The samples was collected once a month for eleven months in the year of 2013 from the different locations of the Youngsan River basin. The organic material BOD and COD/TOC was measured from the six to nine different sites of water samples of lake water, branch stream and main stream of the river, and discharged water from public sewage treatment plants. The purpose of this research was to monitor the changes of those characteristics and distribution ratios. In the lake average COD/TOC was as high as 1.95 ± 0.08, and coefficient of correlation of TOC about COD was also as high as 0.894. This result shows that the environmental standards for TOC are in need of enhancement. In the branch and main stream of the river water average concentration of COD was high and the average of COD/TOC was also high in both the branch stream (2.07 ± 0.08) and the main stream (2.28 ± 0.13). This result shows that a necessary step of management was needed against nondegradable organic materials in the Youngsan River. In the discharged water from public sewage treatment plants the average of COD/TOC was as high as 1.84 ± 0.09, and coefficient of correlation of TOC about COD was also as high as 0.789. Thus, the current COD standard can apply to TOC standard. We can start with the half of the existing COD reference value of discharged water in public sewage treatment plant as TOC reference value, which can be used as an alternative indicator of COD.