EDC指征微污染有机物和亚硝胺副产物去除效能

Using EDC to Indicate Removal Rates of Micro-pollutants and Nitrosamine By-products

在臭氧氧化含有不同反应活性的微污染有机物腐殖酸配水和实际水过程中,该文考察紫外吸收(UV_(254))、供电子能力(EDC)的相对剩余量与微污染有机物和亚硝胺消毒副产物的去除效能的关系。UV_(254)、EDC、微污染有机物、N-二甲基亚硝胺(NDMA)和总亚硝胺(TONO)生成势均随着臭氧投加量增大而逐渐降低,而且UV_(254)与EDC相对剩余量具有二阶线性相关性,因为UV_(254)和EDC都包含高活性芳香族化合物,二者降解均呈现良好相关性。UV_(254)、EDC相对剩余量与微污染有机物去除率具有良好的一阶或二阶线性关系,EDC相对剩余量与NDMA、TONO生成势具有良好的一阶或二阶线性关系。因此,使用EDC相对剩余量来同步指征臭氧氧化过程中微污染有机物和亚硝胺副消毒产物的去除效能,具有良好的应用前景。

The objective of this laboratory experiment is to examine the relationship between the relative residual amounts of UV absorbance(UV_(254))and EDC(electron donating capacity)and the removal efficiency of micro-pollutants and nitrosamine disinfection by-products during ozonation of water containing humic acid.As a result,the findings suggested that the formation potentials of UV_(254),EDC,N-dimethylnitrosamine(NDMA)and total nitrosamine(TONO)all decreased with the increase of ozone dosage added;and the relative residuals of UV_(254) presented a two-phase linear correlation with EDC because both UV_(254) and EDC contained active aromatic compounds,thus showing a good correlation during the ozonation.On the other hand,relative residual amounts of UV_(254) and EDC had a good one-phase or two-phase linear correlation with the removal rate of micro-pollutants;and the relative residual EDC had a good one-phase or two-phase linear correlation with the formation potential of NDMA and TONO.Thereby,EDC relative residual amount can be used to simultaneously indicate the removal rates of micropollutants and byproducts of nitrosamine disinfection during ozonation,which is expected to have a good application prospect.