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 : Jan 21, 2012 04:17:31 | Usually ships in 24 hours

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

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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Transfert d'espèces ioniques dans les membranes de nanofiltration: Étude expérimentale et modélisation de la sélectivité (French Edition)

!±8±Transfert d'espèces ioniques dans les membranes de nanofiltration: Étude expérimentale et modélisation de la sélectivité (French Edition)

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Post Date : Jan 13, 2012 22:16:02
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La nanofiltration est un procédé très utilisé ces dernières années dans de nombreux domaines industriels ou environnementaux tels que le dessalement d'eaux saumâtres, la purification d'effluents, ... L'objectif de ce livre est de présenter l'étude de la séparation de molécules chargées par nanofiltration. Celle-ci repose sur la description des différents phénomènes de transport régissant la rétention d'ions par une membrane chargée. Pour cela, un modèle de connaissance à été élaboré couplant d'une part la description bidimensionnelle du transport dans la couche de polarisation et d'autre part le partage à l'interface membrane / solution et le transport dans les pores. Cette approche fondamentale a été associée à une étude expérimentale de rétention de différentes solutions ioniques par une membrane AFC 40 (PCI). Ces essais nous ont permis de valider notre modèle expérimentalement. Une étude a ensuite été réalisée pour comprendre les interactions entre les mécanismes physiques qui interviennent sur la sélectivité entre les ions mono- et divalents. Pour finir, nous avons porté un regard critique sur les fondements physiques d'un tel modèle afin d'envisager d'éventuelles améliorations.

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Reverse Osmosis and Nanofiltration, 2e (Awwa Manual)

!±8± Reverse Osmosis and Nanofiltration, 2e (Awwa Manual)

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Post Date : Dec 20, 2011 13:15:12 | Usually ships in 24 hours

Updated coverage of selection, installation, operation, and maintenance of reverse osmosis (RO) and nanofiltration systems (NF) in water treatment. Chapter topics encompass theory and applications, design, equipment, installation, operations, and maintenance. Includes tables, figures, appendixes, references, and glossary, with 4-color throughout.

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A Novel Approach to Seawater Desalination Using Dual-Staged Nanofiltration (Awwarf Report)

!±8± A Novel Approach to Seawater Desalination Using Dual-Staged Nanofiltration (Awwarf Report)

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Post Date : Dec 10, 2011 21:54:58 | Usually ships in 24 hours

As the quantity and quality of inland water sources decline, more coastal municipalities are looking at seawater desalination as a potential source of drinking water. The Long Beach Water Department (LBWD) developed an alternative technology to desalt seawater by using dual-staged nanofiltration (NF2). This novel NF system treats the first-stage permeate through a second stage in order to produce finished water with salinity levels that meet drinking water standards. Three commercially-available NF membranes were selected for this study based upon their designation as NF membranes by the manufacturers and their salt rejection characteristics. Results from the bench-scale evaluation were integrated in a performance-predicting model, which was subsequently calibrated against the results obtained with an 8-gpm pilot unit. The pilot-test plan considered the impact of temperature, pressure, and array configuration on permeate water quantity and quality. The percentage of desalinated water that could be blended into LBWD's distribution system was determined by taking into account the issues of disinfection by-product (DBP) formation, disinfectant residual, and corrosivity. Finally, viral challenge tests were considered to verify the inherent redundancy of the system and the impact that recycling streams would have on virus accumulation.

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