| Title |
A Study on the Comparison and Analysis of COD Results by Various Water Samples |
| Authors |
박선구 ; 류재근 ( Sun Ku Park ; Jae Keun Ryu ) |
| Abstract |
This study was performed to change Mn method of Korea at present into Cr method comparing testing methods in each country for the measurement of COD. Office testing method for water quality contamination was newly proposed that advantages were considered by comparing, assessing and evaluating the JIS of Japan, standard method(closed reflux, open reflux) and EPA of U.S.A., Experiments for the KHP standards, lake water and effluent water drained from wastes treatment plant were carried out several times successively to certain reproducibility of each testing method, in result, standard deviation of experiment by proposed method has shown good results more than other ones. The COD of lake and stream water for Han river, Nakdong river, Kum river, and Yungsan river was measured by Mn and Cr method, the concentration of COD was different in each sampling site. In case of lake water with class I∼II, the ratio of COD resulted from two methods was 2∼3times and concentration of COD by Cr method was about 10ppm. The concentration of COD by Cr method was 35ppm at the site contaminated with polluants considerably. Raw wastewater and effluent water of 15 discharge sources for 6 industries were measured for the COD by Mn and Cr method to compare the difference of two methods. The ratio of COD between Mn and Cr method for raw wastewater and effluent water was 2∼4times except industrial chemistry, leather and fur industry. The experiment was also performed to compare oxidation percent for six organic compounds including benzene, Cr method(above 95%) was higher than Mn method(60∼65%). |