不同废水中COD与TOC的区别及相关性研究

Research on Difference and Relativity between COD and TOC in Different Wastewater

本文从定义(意义)、测定原理、测定对象、干扰因素等方面论述了COD与TOC的区别及相关性。简要分析了页岩、印染、医药、食品和化工行业共五类废水中的COD随TOC变化的规律,表明两者的变化趋势虽然总体一致,但也会出现波动,两者不能相互替代,而是相互补充的关系,所以对于复杂水质宜选用多个指标进行综合评价。

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 briefl y analyzed about fi ve 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 fl uctuations.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.