NOM removal in artificial waters From batch experiments to model April – July 2009 Leonard Galais Supervisor : Anke Grefte

1/11 What is NOM ? The Orange – brown color of water is mainly due to NOM NOM is everywhere from the treatment plant to the sewerage network NOM is a complex and highly heterogeneous mixture of organic compounds Humic and Fulvic acids stand for the major part of NOM NOM is entirely due to chemical and biological degradation organics compounds NOM is negatively charged

2/11 What is IEX ? The most efficient way to remove dissolved ionic constituents LEWATIT ® and MIEX ® strong base activity macro porous structure pre-treatment of raw water with efficient IEX resins may increase by a factor 10 the life time of downstream GAC filters (A. Grefte, 2007) Zoom on IEX particules

Aims 3/ Is it possible to measure and identify the different humic substances with S::can and DOC? How are they removed by IEX?

4/11 S::can Measuring UV 254 absorbance

5/11 DOC measurements A different point of view

6/11 Untreated solutions - 1 Comparing artificial solutions of acids

7/11 Untreated solutions - 2 Comparing curves and Looking for relations Error : 22%

8/11 Batch experiments - 1 UV254 absorbance over the time % 37% 26% 60%

9/11 Batch experiments - 2 Influence of the resin amount

10/11 Modeling Are we able to predict breakthrough curves ? SRHA predicted breakthrough curve

Conclusions 11/11 Acids are not measurable with UV, neither with DOC. DOC and UV measurements are different for Humic and Fulvic substances. Fulvic substances are better removed by IEX. To remove 50% of NOM, you may regenerate IEX every 3 weeks at least

NOM removal in artificial waters From batch experiments to model April – July 2009 Leonard Galais Supervisor : Anke Grefte