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Showing 1 to 20 of 26 for “"RO membrane"”.
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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 …
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A study on organic fouling of reverse osmosis membrane
… (BSA), which were model polysaccharide and protein, respectively, to study the polysaccharide 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 …
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Electroding Methods for in situ Reverse Osmosis Sensors
… of this work is to 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 …
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Optimal scheduling, design, operation and control of reverse osmosis desalination. Prediction of RO membrane performance under different design and operating conditions, synthesis of RO networks using MINLP optimization framework involving fouling, boron removal, variable seawater temperature and variable fresh water demand.
An accurate model for RO process has significant importance in the simulation and optimization proposes. A steady state model of RO process is developed based on solution diffusion theory to describe the permeation through membrane and thin film approach is used to describe the concentration …
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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, …
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Nanoporous graphene as a water desalination membrane
Desalination is one of the most promising approaches to supply new fresh water in the face of growing water issues. However, commercial reverse osmosis (RO) techniques still suffer from important drawbacks. In order for desalination to live up to the water challenges of this century, a step-change …
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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 …
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Modification of polyamide thin film composite reverse osmosis membrane for water desalination
… 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 amide layer to create the …
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Structural effects of chloraminated seawater on the SW30HR reverse osmosis membrane
… of how 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 …
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Improvements to Polyamide Reverse Osmosis Membranes for Removal of Small, Neutral, Hydrophilic Solutes
Potable water supplies around the world are under stress. Since 1950 the world population has nearly tripled, while current evidence suggests that conventional potable water supplies are shrinking. One technology with the ability to tap into new potable water sources, such as municipal wastewater, …
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Monitoring, modeling, and controlling membrane fouling and concentration polarization in reverse osmosis systems
Reverse osmosis (RO) has emerged as an important technology in the field of water purification and desalination, offering a highly efficient and sustainable solution for addressing the global water scarcity challenges. The development of thin-film composite (TFC) membranes recently with improved …
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Point of Use Semi-Batch Reverse Osmosis Desalination Prototype Experimental Validation
Water scarcity is undoubtedly a growing problem worldwide. Desalination provides a potential solution to water scarcity by providing water from typically unusable sources (saline brackish aquifers, seawater, or saline surface water), especially to regions that previously did not have reliable …
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Thermodynamically-driven Advances in Efficient and Cost-Effective Desalination and Brine Concentration
… water resources face a number of challenges. Growing global population and rising standards of living have led to increased water demand for domestic use, agricultural irrigation, and industrial processes. The effects of climate change have resulted in changes to historical patterns of rainfall …
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Identification and characterization of aquatic soluble unreactive phosphorus in the hydrosphere with 31-phosphorus Fourier transform nuclear magnetic resonance spectroscopy and high-performance liquid chromatography
… (SUP) present in a small mid-western mesotropic lake were examined with 31-Phosphorus Fourier Transform Nuclear Magnetic Resonance Spectroscopy $\rm (\sp{31}P$ FT-NMR) and High Performance Liquid Chromatography (HPLC). Samples were concentrated and fractionated according to molecular size …
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The effect of wind fluctuations on the membrane of a stand-alone wind powered seawater Reverse Osmosis (RO) desalination unit
… of wind power fluctuations on Reverse Osmosis (RO) membrane lifetime, in terms of variations in membrane inlet flowrate and/or pressure, was investigated experimentally. The RO membranes applied in this project,were spiral wound module, Model: DOW FILMTEC, SW30- 2521 used individually in the rig …
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Role of Exopolymeric Substances in Biofilm Formation on Dairy Separation Membranes
<p>In the concentration of cheese whey by membrane filtration processes, fouling is a major limiting factor that leads to flux decline and affects product quality. The growth of biofilms on membranes contributes to biofouling. Biofilms are very difficult to eliminate, and will serve as the seed for …
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Solid-State NMR Studies of Polymeric and Biomembranes
… as chlorine-resistant reverse osmosis (RO) membrane alternatives to aromatic polyamide (PA) technology, and (2) poly(arylene ether sulfone)s modified with 1,4-cyclohexyl ring units to improve processability. Simple cross-polarization magic-angle-spinning (CPMAS) experiments compared the …
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Thermal Enhanced Oil Recovery and Potential Benefits for Use of Produced Water for Agriculture and Food Security: A Case Study of Oil Fields in South Sudan
… (TEOR) and potential benefits for use of produced water in agriculture and food security, using a case study of oil fields in South Sudan. Oil production in many oil fields in South Sudan is declining, has high water cut, and low recovery factor. It is costly to manage the produced water. …
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Managing the restoration of membranes in reverse osmosis desalination using a digital twin
… for a pressure vessel in a reverse osmosis (RO) desalination plant. In the study context, biofouling is the primary cause of the degradation of the RO membrane elements, amplified by seasonal algal blooms. This research developed a decision support system (DSS) for evaluating membrane …
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Understanding the Impact of High Aspect Ratio Nanoparticles on Desalination Membrane Performance
… that has been addressed on a large scale by membrane-based separation processes for the last six decades. Commercial membrane technology within one operation, reverse osmosis, has remained consistent since the late 1970s, however within the last two decades, access to nanotechnology has …
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