Evaluation of Ultrafiltration Membrane Pretreatment and Nanofiltration of Surface Waters

!±8±Evaluation of Ultrafiltration Membrane Pretreatment and Nanofiltration of Surface Waters

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Post Date : Feb 03, 2012 10:00:07
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Hydranautics: Spiral Wound Reverse Osmosis Elements

!±8± Hydranautics: Spiral Wound Reverse Osmosis Elements

Hydranautics manufactures reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF) membrane products and microfiltration (MF) for water treatment applications around the world, helping meet increasingly stringent regulations and ensure the highest water quality. For more information about Hydranautics membrane products please call 1-800-CPA-PURE or 760-901-2500, visit us online at www.membranes.com or send an e-mail to info@hydranautics.com

Hydranautics: Spiral Wound Reverse Osmosis Elements

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A mechanistic study on the coupled organic and colloidal fouling of nanofiltration membranes.

!±8±A mechanistic study on the coupled organic and colloidal fouling of nanofiltration membranes.

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Post Date : Dec 27, 2011 00:19:07
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The more wide-spread use of nanofiltration membranes in industrial applications is dependent upon understanding the fouling behavior of representative feed solutions, such as complex suspensions with both organic and colloidal inorganic foulants. In this thesis, three hypothesized mechanisms responsible for enhanced membrane flux decline in the presence of multiple foulant types are examined experimentally: increased hydraulic resistance of the mixed cake layer structure, hindered foulant diffusion due to interactions between solute concentration polarization (CP) layers, and changes in colloid surface properties due to organic adsorption. Additionally, a modified composite cell-model is developed to incorporate the structural differences of a merged, combined fouling layer. Results, including a synergistic effect caused by increased resistance of a heterogeneous fouling layer as well as the adsorption effects of interacting foulants, indicate that current fouling layer models need to be reexamined to include the mechanisms suggested in this study.

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