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Application of TOC Standards for Managing Refractory Organic Compounds in Industrial Wastewater

2015; Volume: 31; Issue: 1 Linguagem: Inglês

10.15681/kswe.2015.31.1.29

2289-098X

Ik-Won Choi, Jae Hoon Kim, Jong-Kwon Im, Tae‐Jin Park, Seyoung Kim, Dae-Hee Son, In-Ae Huh, Doughee Rhew, Soonju Yu,

Air Quality Monitoring and Forecasting

The aim of this study is to understand the limitation of organic pollutant indexes ( $BOD_5$ , $COD_{Mn}$ , $COD_{Cr}$ ) and estimate to set the TOC standard by comparing oxidation rates of $BOD_5$ , $COD_{Mn}$ , $COD_{Cr}$ and TOC based on the 487 organic compounds and 11 effluents from industrial wastewater containing various and unknown organic compounds. The range of ratio of theoretical oxygen demand (ThOD) to theoretical organic carbon (TOCt) was 0.00~5.33 and average ratio of classes of organic compounds was 2.68~3.70. According to classes of organic compounds, the average ratio of $O_2/C$ was 1.2 (range : 1.02~1.39). The order of oxidation rate for 15 organic compounds was TOC (90.7%) > $COD_{Cr}$ (88.8%) > $BOD_5$ (54.4%) > $COD_{Mn}$ (30.8%) indicating the lower oxidation rate of $BOD_5$ and COD compared with TOC. The ranking for average oxidation rate was $COD_{Cr}$ > $COD_{Mn}$ > $BOD_5$ indicating that $BOD_5$ , $COD_{Mn}$ could be underestimated comparing with ThOD of organic compounds in case of industrial wastewater containing high concentration of refractory organic compounds. Most of the relationships between organic pollutant indexes and TOC were higher than 0.9. The ratio of TOC to organic compound indexes decreased in the order : $COD_{Cr}$ (3.4) > $COD_{Mn}$ > (1.9) > $BOD_5$ (0.7).