Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 22 for “"reverse osmosis membrane"”.
-
A study on organic fouling of reverse osmosis membrane
… and protein fouling behavior in two lab-scale reverse osmosis (RO) membrane cells in different dimensions. The first test cell was 0.1 m in length and was treated as a homogenous system while the second one was a 1-m long cell which was designed to measure five local permeate flux along the …
-
Structural effects of chloraminated seawater on the SW30HR reverse osmosis membrane
… disinfectants, applied to control biofouling of reverse osmosis (RO) membranes, react with the polymeric active layer and affect membrane performance as a result. This work investigates structural and performance changes to the SW30HR RO membrane exposed to seawater disinfected with …
-
Modification of polyamide thin film composite reverse osmosis membrane for water desalination
… thin film ZnO-Graphene quantum dots composite reverse osmosis (TFQ-RO) membrane was prepared by the interfacial polymerization of m-phenylenediamine (MPD) and trimesoyl chloride (TMC) monomers on a porous polysulfone support. ZnO-graphene quantum dots (19 nm) were dispersed within the poly …
-
Effect of solids retention time in membrane bioreactors on reverse osmosis membrane fouling
… there is an increasing interest in water reuse. Membrane bioreactors (MBRs) are commonly used in wastewater treatment plants, though reuse of treated wastewater for potable purposes requires more advanced treatment. Reverse osmosis (RO), a water treatment process commonly used for drinking water, …
-
Development of Modified Reverse Osmosis Membrane with Polymers/Graphene Oxide for Scaling and Biofouling Mitigation
… need for efficient desalination technologies. Reverse osmosis (RO) is widely used due to its energy efficiency; however, operational challenges such as scaling and biofouling hinder membrane performance, reducing water flux and increasing maintenance costs. This study uniquely explored, the …
-
Effect of the water disinfectant chlorine dioxide on the integrity of a reverse osmosis membrane
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Seth Robbins (robbins.sd@gmail.com) on 2014-05-30T17:10:15Z Item is restricted until 2016-05-30T17:09:03Z
-
The Development of Real-Time Fouling Monitoring and Control Systems for Reverse Osmosis Membrane Cleaning using Deep Reinforcement Learning
… Learning (ML) and real-time fouling monitors in Reverse Osmosis (RO) desalination. The main objective was to develop a framework that minimizes the cost of membrane fouling by deploying AI-generated cleaning patterns and real-time fouling monitoring. Membrane manufacturers and researchers …
-
Investigating the parameters of metal-organic framework crystal growth control for reverse osmosis membrane nanofillers and direct air capture of CO2
… materials such as functionalized nanofillers for reverse osmosis (RO) desalination. The work described herein investigates synthetic parameters of a zirconium-based porphyrinic MOF, PCN-222, to selectively control its crystal size, aspect ratio, and dispersity. Size-constrained PCN-222 was …
-
The effect of very high hydraulic pressure on the permeability and salt rejection of reverse osmosis membranes
A stirred-cell reverse osmosis setup was used to demonstrate that a seawater reverse osmosis membrane can maintain excellent rejection at pressures as high as 172 bar. However, it was also demonstrated that there was a significant drop in permeability at high pressures - likely due to membrane …
-
Causes and analysis of failures in in-situ microscopy observation for the characterization of scaling in membrane distillation membranes
In membrane technology at large, fouling limits membrane performance and membrane lifespan. In the case of reverse osmosis membrane distillation (MD) involving fluid mixtures of inorganic elements, inorganic foulants build up on membrane surfaces, and reduce the flux of fluids across a membrane. …
-
The design of a controllable energy recovery device for solar powered reverse osmosis desalination with experimental validation
… device with application to photovoltaic powered reverse osmosis (PVRO). The energy consumption of a reverse osmosis plant depends significantly on the efficiency of its energy recovery process. This work presents a concept for a controllable energy recovery process, so that a system can operate …
-
The removal of pesticides and heavy metals by reverse osmosis
… in surface water and groundwater has increased. Reverse osmosis is a unit process that has demonstrated capacity to remove dissolved pesticides and heavy metals from aqueous solution, and it is therefore worthwhile to consider this treatment process as a potential removal technique for hazardous …
-
The design and control of a thermal management system for a photovoltaic reverse osmosis system
Reverse osmosis (RO) is a well-known process for desalinating seawater and brackish groundwater. Desalination is energy-intensive, so using photovoltaic (PV) panels to power the process is an attractive environmentally friendly concept, especially for community-scale systems. Increasing the system …
-
Synthesis and Characterization of Sulfonated Poly(arylene ether sulfone)s for Membrane Separations
… poly(arylene ether sulfone)s to improve membrane performance. Blends of a 20% disulfonated poly(arylene ether sulfone) (BPS20) with poly(ethylene glycol) (PEG) were investigated with the objective of promoting water flux across a reverse osmosis membrane. It was considered desirable to …
-
Changes in the structure of SW30HR RO membrane exposed to chloraminated seawater and synthetic solutions
Changes in the structure of the SW30HR RO membrane exposed to seawater, phosphate buffer, and standard seawater disinfected with monochloramine (NH2Cl) are investigated. Three types of experiments were performed: (1) exposure of RO membrane (active and support layers) to monochloramine (2, 20 and …
-
Characterization of polymeric membranes: sulfonated polysulfones
… desirable physical properties for use as a reverse osmosis desalination membrane. In this work, an extensive of dense membranes made from sulfonated polysulfone having 0.2, 0.4, 0.5, 0.6, 0.8, and 1.0 degree of sulfonation is described. The degree of sulfonation (D.S.) was maintained during …
-
Chemistry and Measurement at Aqueous Nanoscale Interfaces
… The second describes the synthesis of polyamide membrane active layers using a support-free approach and examines the effect of monomer concentration on the morphology, water sorption, longitudinal elastic constant, and thermal transport properties of the film. Although these two areas do not …
-
Growth dynamics, charge density, and structure of polyamide thin-film composite membranes
… of polyamide for thin-film composite reverse osmosis membranes using diffuse reflectance spectroscopy, Rutherford backscattering spectrometry (RBS), and atomic force microscopy (AFM); (2) quantifying the effects of trimesoyl choride (TMC) and m-phenylenediamine (MPD) monomer …
-
Nanocomposites: Incorporation of Cellulose Nanocrystals into Polymers and Addition of Zwitterionic Functionality
… functionalized with the intention of filling reverse osmosis membrane materials to have surface chemistry that could be impart antibacterial properties and increase flux. CNCs were functionalized with carboxylic acid by 2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO)-mediated oxidation, then …
-
Electroding Methods for in situ Reverse Osmosis Sensors
… develop and evaluate electroding methods for a reverse osmosis (RO) membrane that results in an in situ sensor able to detect RO membrane protein fouling. Four electroding techniques were explored: i) gold exchange-reduction, ii) encapsulated carbon grease, iii) "direct assembly process" (DAP), …
Page 1 of 2