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.
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Showing 1 to 20 of 252 for “"Reverse osmosis"”.
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Colloidal fouling of reverse osmosis membranes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
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Direct solar photovoltaic powered reverse osmosis plant
… solution is to use a direct solar powered Reverse Osmosis system to desalinate the brackish groundwater found in these areas. Due to the nature of reverse osmosis, each system is unique and has to be designed for the specific application. There is no one size fits all solution. With the …
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PHOTOELECTROCATALYTIC OXIDATION OF MUNICIPAL REVERSE OSMOSIS CONCENTRATE
… this PEC system was applied to a real municipal reverse osmosis concentrate (ROC) for the oxidations of emerging contaminants and bulk organics. The corresponding degradation efficiency and energy consumption were analysed. Primary reactive species under different operational conditions were …
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Methacrylic membranes for desalination by reverse osmosis,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1968.
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Effects of hydrocarbon fouling on reverse osmosis membranes
Organic fouling in reverse osmosis (RO) has been studied using model hydrocarbons such as hexane and diesel. A large number of countries that use reverse osmosis to obtain drinking water also are producers and exporters of hydrocarbons. This makes seawater RO units particularly susceptible to …
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Engineering nanostructured selective layers for reverse osmosis membranes
… with poor access and sanitation in 2007. Reverse osmosis (RO), a process through which water is desalted via pressurized flow past a salt-selective membrane, is an energy-efficient method to generate freshwater from oceanic, brackish, and waste water sources. However, there are a number of …
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Split-feed counterflow reverse osmosis for brine concentration
… a model is developed to simulate Counterflow Reverse Osmosis (CFRO), a membrane-based, pressure-driven brine concentration technology. Using this model, a single CFRO module is simulated and its performance characterized. Entropy generation within a single-stage system is analyzed, which …
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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), …
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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 …
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Removal of organic contaminants from groundwater by reverse osmosis
… membrane has been evaluated in a full scale reverse osmosis system. A series of experiments were conducted with six aromatic compounds - anthracene, pyrene, fluorene, 2-chlorobiphenyl, 2,4,6 trichlorophenol, and pentachlorophenol- and four volatile compounds - trichloromethane, …
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Stand-alone solar-pv hydrogen energy systems incorporating reverse osmosis
… Exchange Membrane (PEM) fuel cells. Whilst small Reverse Osmosis (RO) units may function as a (useful) dump load, it also directly impacts the power management of stand-alone energy systems and affects operational characteristics. However, renewable energy sources are intermittent in nature, thus …
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Fast reverse osmosis through nanotube-based membranes: molecular dynamics study
… simulation to investigate the methods to improve reverse osmosis process, which can produce high quality water by removing ions and emerging pollutants. In the first part, we investigate reverse-osmosis through commonly used polymeric and advanced inorganic nanotube based semi-permeable membranes …
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Can Batch Reverse Osmosis Make Desalination More Affordable and Sustainable?
Reverse osmosis (RO) desalination can help to ensure secure water resources, but the process remains costly. From 2007-2017, global desalination capacity nearly doubled, from 47 to 92 million m3 /day, with RO accounting for two thirds of installed capacity. Despite this growth, the total volume of …
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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 …
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Examination of Silica Removal with Solids Recycle for Reverse Osmosis Pretreatment
… on the surfaces of industrial equipment and reverse osmosis membranes. For this reason, the subject of silica removal has been the focus of many studies; yet, there remains much to be learned. This thesis aimed to study the complex issue of silica removal as a pretreatment step to RO. A …
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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 …
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Design of advanced reverse osmosis and nanofiltration membranes for water purification
Most 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 …
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Point of Use Semi-Batch Reverse Osmosis Desalination Prototype Experimental Validation
… in Kuwait to home-scale point-of-use (POU) reverse osmosis (RO) purifiers in India. However, current home-use systems produce significant amounts of wastewater, achieve a recovery of 20-30% of the input feed as drinking water, and consume significant energy. Through previous testing and …
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Autonomous control and membrane maintenance optimization of photovoltaic reverse osmosis systems
… to this problem is to use photovoltaic powered reverse osmosis (PVRO) systems to purify this unsafe water to produce clean drinking water. However, high initial capital costs and a lack of commercial viability have prohibited these systems for commercial and daily use. For this approach to be …
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