- 11 April 2007 -

Study can determine media lifetime

Dow Water Solutions has created a model that accurately determines the lifetime of adsorptive arsenic removal media based on the chemistry of the water being treated.

Results of the semi-empirical study, titled "Predicting Arsenic Removal Lifetime for ADSORBSIAT GTOT Media," will be presented at the 2007 National Ground Water Association's (NGWA's) "Naturally Occurring Contaminants Conference: Arsenic, Radium, Radon, Uranium," held in the US in March. The study predicts the impact of water quality on the performance of adsorptive arsenic removal media and also highlights the importance of media selection and performance to the overall water treatment system design.

To determine the lifetime of adsorptive media under various water quality conditions, Dow Water Solutions created a model that accurately projects the impact of silica and pH levels of the water, in addition to the level of arsenic contamination, on its proprietary Adsorbsia titanium-based arsenic removal media. The results indicate that silica and pH, as well as other competing ions present in the water, can affect the capacity and bed performance of adsorptive media as much as, or more than, arsenic levels. In tests conducted with high levels of silica and pH, Adsorbsia media performed better than competing technologies, indicating the media's effectiveness in reducing arsenic to non-detectable levels under varying water quality conditions, the company says.

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