POE Purifier for the Home with High Efficiency UV and Metal Removal
Abstract:A high efficiency UV reactor in combination with high capacity metal removal and organic adsorbents for point-of-entry home water purification is described. The purifier provides water exceeding EPA standards across a wide range of incoming water conditions; test data show 6 log pathogen reduction by the UV module in combination with reduction of heavy metal to sub-EPA standards.
Thin film annular reactors comprising two concentric cylinders provide large surface-to-volume ratio, increasing the UV dosage and reducing the radiation path length. To optimize pathogen reduction between concentric cylinders, the inactivation in laminar Poiseuille flow, turbulent flow and laminar Taylor-Couette flow was investigated experimentally and numerically; improved designs for Taylor-Couette based reactors are discussed.
New high capacity metal removal adsorbents employing cross-linked chitosan are discussed. It is projected that metal and organic removal upstream of a UV reactor improve UV efficiency, enabling a low cost system for the home; comparison to a conventional UV system is presented.
Document Type: Research Article
Publication date: January 1, 2009
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