This study was conducted to investigate the effect of sewage efffluent organic matter on the river in the Gumi industrial Complex 4, Gumi, and Wonpyong sewage treatment plants and upstream and downstream of the river. As a result of the study, there appeared more than two-fold increases at the lower...
This study was conducted to investigate the effect of sewage efffluent organic matter on the river in the Gumi industrial Complex 4, Gumi, and Wonpyong sewage treatment plants and upstream and downstream of the river. As a result of the study, there appeared more than two-fold increases at the lower stream in case of discharge while conductivity, turbidity and suspended solid increased. DOC occupied more than 70% of TOC, which existed mostly in dissolved status, and oxidation ratios BOD and CODMn as against TOC showed the results similar to the existing research. However, the rate of the currently used BOD and CODMn in TOC was about less than 59 %, appearing to be difficult in representing organic matter; thus, it is considered that there should be an additional study on the direction to convert the indicator into TOC. As a result of decomposition experiment, R-DOC among DOC was found to exist more than 70 %, mostly being occupied by refractory organic matters. Looking into the effect of the organics from discharge of a sewage treatment plant on rivers, the ratios of TOC, L-DOC, and R-DOC loadings in the discharge from sewage treatment plants at Gumi industrial Complex 4, Gumi, and Wonpyong on lower streams of the Nakdong river were found to be 15 %, 6 % and 16 % respectively. The ratio of 15 % suggests that comparatively not large portions of TOC loadings are occupied, but the problem is that biodegradable organic matters occupy a lot more proportions than refractory organic matters. Thus, it is mostly assumed that refractory organic matters will be operating as a factor in gradually increasing the pollution level of organic matters and it is considered that refractory organic matters will be also operating as a factor in the increase of the precursor of disinfection by-product when treating water supply later on. Should an analysis of the examination results during the wet and rainy periods excepting the survey period of this research, and the result after the standard of discharge from a sewage disposal plant is intensified be done, a little bit different result will be expected. In addition, it is thought that when a goal and standard of water-purity control are set up later, and watershed management policy of water system and management plan for a total amount of polluted organic matters are established through its subsequent results, there will be more diverse management plans to be derived.
This study was conducted to investigate the effect of sewage efffluent organic matter on the river in the Gumi industrial Complex 4, Gumi, and Wonpyong sewage treatment plants and upstream and downstream of the river. As a result of the study, there appeared more than two-fold increases at the lower stream in case of discharge while conductivity, turbidity and suspended solid increased. DOC occupied more than 70% of TOC, which existed mostly in dissolved status, and oxidation ratios BOD and CODMn as against TOC showed the results similar to the existing research. However, the rate of the currently used BOD and CODMn in TOC was about less than 59 %, appearing to be difficult in representing organic matter; thus, it is considered that there should be an additional study on the direction to convert the indicator into TOC. As a result of decomposition experiment, R-DOC among DOC was found to exist more than 70 %, mostly being occupied by refractory organic matters. Looking into the effect of the organics from discharge of a sewage treatment plant on rivers, the ratios of TOC, L-DOC, and R-DOC loadings in the discharge from sewage treatment plants at Gumi industrial Complex 4, Gumi, and Wonpyong on lower streams of the Nakdong river were found to be 15 %, 6 % and 16 % respectively. The ratio of 15 % suggests that comparatively not large portions of TOC loadings are occupied, but the problem is that biodegradable organic matters occupy a lot more proportions than refractory organic matters. Thus, it is mostly assumed that refractory organic matters will be operating as a factor in gradually increasing the pollution level of organic matters and it is considered that refractory organic matters will be also operating as a factor in the increase of the precursor of disinfection by-product when treating water supply later on. Should an analysis of the examination results during the wet and rainy periods excepting the survey period of this research, and the result after the standard of discharge from a sewage disposal plant is intensified be done, a little bit different result will be expected. In addition, it is thought that when a goal and standard of water-purity control are set up later, and watershed management policy of water system and management plan for a total amount of polluted organic matters are established through its subsequent results, there will be more diverse management plans to be derived.
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