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 316 for “"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
… 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 help of …
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PHOTOELECTROCATALYTIC OXIDATION OF MUNICIPAL REVERSE OSMOSIS CONCENTRATE
… 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 profiled for …
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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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Experimental investigation of induced-charge electro-osmosis
… the general phenomenon of induced-charge electro-osmosis (ICEO), nonlinear electro-osmotic slip generated when an electric field acts on its own induced charge around a polarizable surface, in the context of microfluidics. Simple ICEO flows are first observed around a platinum wire in a polymer …
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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
… 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 provides …
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Electroding Methods for in situ Reverse Osmosis Sensors
… 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), and iv) …
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A study on organic fouling of reverse osmosis membrane
… 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 channel. It …
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Removal of organic contaminants from groundwater by reverse osmosis
… 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, bromodichloromethane, …
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Stand-alone solar-pv hydrogen energy systems incorporating reverse osmosis
… 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 power …
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Fast reverse osmosis through nanotube-based membranes: molecular dynamics study
… 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 by …
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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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Exploring Forward Osmosis Systems for Recovery of Nutrients and Water
… a proof of concept process based on forward osmosis (FO) was proposed and investigated for in-situ formation of struvite from digested swine wastewater. This FO system took advantage of a drawback reverse solute flux (RSF) and used the reversed-fluxed Mg^{2+} for struvite precipitation, …
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The removal of pesticides and heavy metals by reverse osmosis
… 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
… 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 review of the …
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Structural effects of chloraminated seawater on the SW30HR reverse osmosis membrane
… 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 monochloramine. Batch …
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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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