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Showing 1 to 20 of 88 for “"nanofiltration"”.
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MEMBRANE DEVELOPMENT FOR ORGANIC SOLVENT NANOFILTRATION APPLICATION
Organic solvent nanofiltration (OSN) is a straightforward yet effective membrane-based molecular separation technology with significant applicability in food, pharmaceutical, and petrochemical industries. This thesis tends to cover different methods for the fabrication and modification of polyimide …
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Modeling nanofiltration for large scale desalination applications
… leaves to develop a comprehensive model for nanofiltration modules. This model allows the user to gain insight into the physics of the nanofiltration process by allowing one to adjust and investigate effects of membrane charge, pore radius, and other membrane characteristics. The study shows …
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Development of Synthetic Nanofiltration Membranes for Water Treatment
Embargo set by: Seth Robbins for item 85568 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Modeling Nanofiltration Separation Mechanisms in Covalent Organic Framework Membranes
Solute transport in nanofiltration (NF) membrane systems is described with the Donnan Steric Pore Model with Dielectric Exclusion (DSPM-DE), which couples size- and charge-based solute partitioning mechanisms into and out of membrane pores with flow through pores, as described by the Extended …
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Effects of Magnetically Induced Micro-mixing on Nanofiltration Performance
<p>Nanofiltration (NF) is a relatively new membrane separation process mainly used for removing low molecular weight species from aqueous and non-aqueous solutions. NF membranes suffer from concentration polarization leading to membrane fouling thus compromised membrane performance. Magnetically …
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Nanofiltration membranes modified with aromatic polyamide dendrimers active layers
… the modification of the commercial TFC-S nanofiltration membrane with shape-persistent dendritic architectures. Amphiphilic aromatic polyamide dendrimers (G1-G3) are synthesized via a divergent approach and used for membrane modification by direct percolation. The permeate samples …
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Treating Brackish Groundwater for Irrigation with Selective Electrodialysis & Nanofiltration
… selective electrodialysis (SED) and nanofiltration (NF), are evaluated to treat the brackish groundwater as an alternative to RO. Unlike RO, both SED and NF can remove monovalent ions from the brackish groundwater feed stream while retaining the divalent ions, producing an irrigation …
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Development and performance characterization of first-generation dendrimeric nanofiltration membranes
… Consequently there is a need to develop nanofiltration (NF) membrane filtration processes effective in removing dissolved organic matter while allowing passage of inorganic salts. In this project, seven distinct novel first generation (G1) NF polyamide membranes have been developed and …
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Effect of iodination on NF270 nanofiltration membrane structure and performance
Made available in DSpace on 2017-09-29T17:56:46Z (GMT). No. of bitstreams: 2 LEVATO-THESIS-2017.pdf: 2402000 bytes, checksum: 8c4f49706ddd057c5afa20f7897ce3cd (MD5) LICENSE.txt: 4213 bytes, checksum: 3a65aed08aeda2d8e61923f83a1c2953 (MD5) Previous issue date: 2017-07-14
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The influence of temperature on ion transport in nanofiltration membranes
Nanofiltration (NF) is a pressure-driven membrane-based solution treatment technology, similar to reverse osmosis (RO). The niche set of applications for NF includes those requiring selectivity between monovalent ions and multivalent ions. Incoming streams to be treated can occur over a wide range …
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Design of advanced reverse osmosis and nanofiltration membranes for water purification
… commercially available reverse osmosis (RO) and nanofiltration (NF) membranes are based on the thin film composite (TFC) aromatic polyamide membranes. However, they have several disadvantages including low resistance to fouling, low chemical and thermal stabilities and limited chlorine tolerance. …
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Hydraulic Fracturing Water Recycle through Optimal Ultrafiltration and Nanofiltration Membranes System Design
… through different types of ultrafiltration and nanofiltration membranes. </p> <p>Through ultrafiltration, the hydraulic fracture water is pretreated to remove the majority of total suspended solids (TSS) and turbidity. The water flux, chemical oxygen demand (COD), turbidity, TSS, and salt level …
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Control of size and charge selectivity in amphiphilic graft copolymer nanofiltration membranes
… food and wastewater treatment industries. Nanofiltration (NF) membranes fill an important niche between nonporous reverse osmosis membranes, which have comprehensive solute rejection and low solvent permeability, and porous sieving ultrafiltration membranes. However, challenges in NF …
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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 …
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Ageing under extreme ph conditions, modification and characterization of ultrafiltration and nanofiltration membranes
… study of the ageing of ultrafiltration (UF) and nanofiltration (NF) membranes under long-term exposure to acidic and alkaline cleaning solutions. A theoretical model has been developed for the interpretation of liquid-liquid displacement porosimetry (LLDP) results. In addition, membranes with an …
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A Mechanistic Study of Arsenic (Iii) Rejection by Reverse Osmosis and Nanofiltration Membranes
Reverse osmosis/nanofiltration (RO/NF) membranes are capable to provide an effective barrier for a wide range of contaminants (including disinfection by-products precursors) in a single treatment step. However, solute rejection mechanisms by RO/NF membranes are not well understood. The lack of …
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Development and physicochemical characterization of thin-film composite nanofiltration membranes with covalent organic framework active layers
… restricted a more widespread implementation of nanofiltration (NF) and reverse osmosis (RO) technologies. In addition, the similar polyamide (PA) chemistry used for most commercially available NF and RO membranes limits the water permeability and solute selectivity that could be achieved. In …
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Modeling low-pressure nanofiltration membranes and hollow fiber modules for softening and pretreatment in seawater reverse osmosis
Recently, interest in nanofiltration (NF) has been surging, as has interest using it as a technology for better brine management and pretreatment in reverse osmosis (RO) plants. Using NF for pretreatment reduces fouling and scaling in RO units, allowing for potentially higher recoveries. This …
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Nanofiltration Rejection of Contaminants of Emerging Concern from Municipal Water Resource Recovery Facility Secondary Effluents for Potable Reuse Applications
… exists for tight thin-film composite (TFC) nanofiltration (NF) membranes to provide acceptable CEC rejection efficacies for less capital, operations and maintenance (O&M), energy, and waste generated.</p> <p>Recognizing the inherent complexity of CEC rejection by membranes, this research …
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Partitioning and Diffusivity of arsenic(III) in the Active Layer of Thin-Film Composite Reverse Osmosis and Nanofiltration Membranes
The main objective of this study, therefore, was to understand the mechanism controlling the permeation of a neutral molecule (arsenic (III)) through RO/NF membranes. The permeation of potassium iodide (KI), used as background electrolyte, was also investigated. This study introduced Rutherford …
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