산업폐수의 총유기탄소(TOC) 특성 - 전남 동부권 사업장을 중심으로 -

Abstract

TOC was applied to the effluent new standard as a substitute of COD_Mn. But the setting of the TOC did not reflect the characteristics of various wastewater, such as the treatment facility size and the discharge type. This study assessed each industrial facility in terms of water quality characteristics by replacing COD_Mn with TOC. In the study, 96 data groups across ten industrial categories based on the Korean Standard Industrial Classification were measured COD_Mn and TOC to obtain data about waste water discharge facilities in the eastern parts of Jeollanam-do province. The measurements show that the mean COD_Mn and TOC concentration were in the ranges of 4.2 mg/L ∼ 82.0 mg/L and 3.7 mg/L ∼ 195.4 mg/L, respectively. The relative ratio(COD_Mn/TOC) was 0.42 ∼ 1.50 and the oxidation rate of COD_Mn was 12.69 % ∼ 45.45 %. The TOC emission rate against the acceptable emission criteria was in the range of 7.73 % ∼ 100.72 %. The result of TOC and COD_Mn was 82.0 mg/L and 195.4 mg/L in other food manufacturing facilities, 8.5 mg/L and 14.2 mg/L in basic petrochemical compound manufacturing facilities, 24.8 mg/L and 25.7 mg/L in transportation equipment repair and car washing or cleaning facilities. Correlations among different organic matters were analyzed according to business categories, and the results show a range of 0.9813 ∼ 0.3742, which points to huge differences among business categories. In addition, the study examined 10 items in 4 Establishments, whose wastewater discharge was less than 200 m3. The result showed that their organic matter discharges had been underestimated as they were in the food industry. These results raise a concern with the possibilities of their exceeding the criteria in case of TOC application and a need for them to improve their processes and consequently change their management methods.