Natural Organic Matter And Isoproturon Adsorption By Activated Carbon: AComparison Between RSSCT And Modeling approaches

摘要

In the UK, most of the resources used by the Northumbrian Water group to produce drinking water are surface waters characterized by high natural organic matter (NOM) concentrations as well as by pesticides occurrence when located in agricultural areas. Consequently, the THM formation risk has to be considered as well. In this context, Northumbrian Water drinking water suppliers have to implement efficient processes on their treatment works torncomply with the current EU regulation on THM and on pesticides (100 μg/L and 0.1 μg/L respectively). Among the different solutions tested to improve the existing WTW, adsorptionrnon granular activated carbon (GAC) filters was tested within this study to solve both NOM and pesticides issues. The objective of this paper is to present the results obtained by this study by two different approaches to simulate the full scale GAC breakthrough curves forrnNOM and isoproturon: the Rapid Small Scale Column Test (RSSCT) and the Homogeneous Surface Diffusion Model (HSDM). The main interest of RSSCT method is its ability tornpredict a one year breakthrough curve in one to two months test under dynamic conditions. The main interest of HSDM method is the ability to easily and quickly simulate GACrnbreakthrough curves for different initial NOM and isoproturon concentrations or differentrnGAC filter characteristics based on the same isotherms and kinetics bench scale experiments. The comparison between the results obtained by the two methods shows good correlation. Keywords Isoproturon, Natural organic matter, Activated carbon, Rapid small-scale column test, Homogeneous surface diffusion model.