Research on Difference and Relativity between COD and TOC in Different Wastewater
This article discusses the differences and correlations between COD and TOC from the aspects of definition(meaning),measurement principle,measurement object,interference factors,etc.The changing regulation of COD with TOC was briefly analyzed about five types of wastewater including shale,printing and dyeing,medicine,food and chemical industry,which shows that although the changing trend of COD and TOC is generally consistent,there will be fluctuations.COD and TOC cannot replace each other,but complement each other,so water samples with a complex composition should be comprehensively evaluated with of multiple indicators.