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Topic: Reverse osmosis

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	Reverse osmosis - Wikipedia, the free encyclopedia
		Reverse osmosis is the process of pushing a solution through a filter that traps the solute on one side and allows the pure solvent to be obtained from the other side.
		This is the reverse of the normal osmosis process, which is the natural movement of solvent from an area of low solute concentration, through a membrane, to an area of high solute concentration when no external pressure is applied.
		The use of reverse osmosis allows approximately 75 to 80% of the water to be removed from the sap, reducing energy consumption and exposure of the syrup to high temperatures.
	en.wikipedia.org /wiki/Reverse_osmosis (1448 words)

	Reverse osmosis
		Reverse Osmosis (RO) is a filtration technique where you add pressure to the fluid with the highest salt concentration and then press this fluid a very fine membrane (0.001-0.0001 µm) which can filter both ions and dissolved matters in the water.
		The principle of reverse osmosis is that the saline raw water is led in across a membrane.
		In a reverse osmosis plant only a certain percentage of the inlet water is utilised, normally between 75 and 80 %, if the plant is equipped with pre-treatment, and between 40 and 50 % without pre-treatment - the rest is discharged as concentrate.
	www.hoh.com /02_processer/omvendt_osmose.htm (678 words)

	Reverse Osmosis Water Filters and Water Purification
		Reverse osmosis uses a membrane that is semi-permeable, allowing pure water to pass through it, while rejecting the contaminants that are too large to pass through the tiny pores in the membrane.
		Reverse osmosis successfully treats water with dissolved minerals and metals such as aluminum, arsenic, barium, cadmium, chloride, chromium, copper, fluoride, magnesium, iron, lead, manganese, mercury, nitrate, selenium, silver, sulfate, and zinc.
		Because reverse osmosis water purification occurs slowly (it is a very fine filter!), a storage tank is used to hold 3 gallons of purified water at all times so pure water is always at your finger tips.
	www.home-water-purifiers-and-filters.com /reverse-osmosis-filter.php (1473 words)

	Reverse Osmosis Systems
		Reverse osmosis is used to purify and remove salts and other impurities in order to improve the color, taste or properties of the fluid.
		The process of reverse osmosis requires a driving force to push the fluid through the membrane, and the most common force is pressure from a pump.
		Reverse osmosis is capable of rejecting bacteria, salts, sugars, proteins, particles, dyes, and other constituents that have a molecular weight of greater than 150-250 daltons.
	www.windtrax.com /featured_products/05_new_items.asp (1274 words)

	Reverse Osmosis
		Osmosis is a special case of diffusion in which the molecules are water and the concentration gradient occurs across a semi permeable membrane.
		Reverse osmosis occurs when the water is moved across the membrane against the concentration gradient, from lower concentration to higher concentration.
		In reverse osmosis, pressure is exerted on the side with the concentrated solution to force the water molecules across the membrane to the fresh waterside.
	www.eecusa.com /reverse_osmosis.htm (645 words)

	Watermakers by Horizon Reverse Osmosis. Marine reverse osmosis desalinators.
		Horizon Reverse Osmosis (HRO) was established in 1975 and became the first manufacturer of compact, economic marine watermakers for use in the boating industry.
		We offer sea water reverse osmosis desalination equipment.Unlike osmosis, which is the natural tendency of pure water to flow through a membrane into impure water.
		Reverse osmosis is achieved by applying very high pressure to seawater to counteract the osmotic flow.
	www.hrosystems.com (714 words)

	Reverse Osmosis Water Treatment
		Reverse osmosis is effective in rejecting organic solutes with molecular weights greater than 200 to 300, such as fulvic acids, lignins, humic acids and detergents.
		The placement of carbon filters in reverse osmosis systems depends on the type of membrane in use: for cellulose acetate or cellulose triacetate membranes the carbon element is usually placed AFTER the membrane and captive air tank, and just before the dispensing faucet.
		Placement of a reverse osmosis system(without auxiliary processing capabilities such as ultraviolet or ozone) in a rural environment which is naturally prone to a wider and greater concentration of microbiological hazards is also cautioned.
	www.aquatechnology.net /reverse_osmosis.html (2863 words)

	Spiral Membranes and Reverse Osmosis Equipment
		Reverse osmosis (RO) is used to reduce dissolved solids from feed waters with salinities up to 45,000 ppm TDS (total dissolved solids).
		Reverse osmosis separation technology is used to remove dissolved impurities from water through the use of a semi-permeable membrane.
		RO involves the reversal of flow through a membrane from a high salinity, or concentrated, solution to the high purity, or "permeate", stream on the opposite side of the membrane.
	www.gewater.com /library/tp/833_What_Is.jsp (447 words)

	Reverse Osmosis Filtration Technology
		Osmosis is a natural process in which a fluid passes through a semi-permeable membrane from a higher concentration to a lower concentration.
		Reverse osmosis is a separation process in which the membrane "filters" dissolves solids.
		Reverse osmosis [RO] is known as the "high tech" method for reduction of dissolved inorganic contaminants and higher molecular weight organic contaminants.
	www.thstore.com /thstore/technologies_2_Reverse_Osmosis.asp (448 words)

	QUESTIONS AND ANSWERS ABOUT REVERSE OSMOSIS, WATER PURIFICATION AND FILTRATION
		A. The reverse osmosis system itself is fairly simple, consisting of a series of tube containing the membranes with a high pressure pump to force the water through the system.
		The schematic shows a simplified front end reverse osmosis system where the city water is filtered, softened to remove hardness, the carbon is used to remove the city chlorination (membranes are sensitive to oxidizers).
		Reverse osmosis systems are very sensitive to plugging so the recycled stream must be carefully evaluated as to ionic and particulate content.
	www.remco.com /ro_quest.htm (2604 words)

	ProblemWater.com - Reverse Osmosis
		A reverse osmosis system is an effective means of providing a household with gallons of fresh water at a fraction of the cost of premium bottled water.
		Osmosis is the natural tendency for water of lesser concentration (containing more dissolved particles) to pass through a semi-permeable membrane and dilute water of a higher concentration (containing more dissolved particles).
		Reverse Osmosis, as its name implies, is the reversal of the natural flow of osmosis.
	www.problemwater.com /ro_info.htm (495 words)

	Flowmatic - Your Single Source Supplier for R.O. Systems
		Osmosis is a natural process, known for over 200 years, on which reverse osmosis systems are based.
		Although for the counter top Reverse Osmosis modules and some permanently installed units, the storage tanks are maintained at atmospheric pressure - the majority of under-the-sink installations utilize accumulator storage vessels.
		To conserve water consumption in reverse osmosis devices another type of control called "shutdown" is employed in the design using a shutoff valves and is illustrated in Figure 9.
	www.flowmatic.com /aboutro.htm (1300 words)

	Osmosis - Wikipedia, the free encyclopedia
		Osmosis is the movement of water through a semipermeable membrane from a region of low solute potential to a region of high solute potential (or equivalently, from a region of high solvent potential to a region of low solvent potential).
		Osmosis is an important topic in biology because it provides the primary means by which water is transported into and out of cells.
		The osmosis process can be driven in reverse with solvent moving from a region of high solute concentration to a region of low solute concentration by applying a pressure in excess of the osmotic pressure.
	en.wikipedia.org /wiki/Osmosis (1116 words)

	Water Quality Association What Is...Reverse Osmosis?
		Reverse osmosis systems can be found providing treated water from the kitchen counter in a private residence to installations used in manned spacecraft.
		The process of reverse osmosis forces water with a greater concentration of contaminants (the source water) into a tank containing water with an extremely low concentration of contaminants (the processed water).
		Reverse osmosis is a relatively new, but very effective, application of an established scientific process.
	www.wqa.org /sitelogic.cfm?ID=872 (1318 words)

	Treatment Systems for Household Water Supplies - Reverse Osmosis
		The principal uses of reverse osmosis in Minnesota and the Dakotas are for the reduction of high levels of nitrate, sulfate, sodium and total dissolved solids.
		Reverse osmosis is sometimes referred to as ultrafiltration because it involves the movement of water through a membrane as shown in Figure 1.
		Reverse osmosis is a proven technology that has been used successfully on a commercial basis.
	www.ag.ndsu.edu /pubs/h2oqual/watsys/ae1047w.htm (1969 words)

	Understanding Reverse Osmosis Water Systems
		Reverse osmosis, also known as hyperfiltration, is the finest filtration known.
		Reverse osmosis is used to purify water and remove ions and dissolved organic molecules.
		Reverse osmosis uses a membrane that is semi-permeable, allowing the fluid that is being purified to pass through it, while rejecting the contaminants that remain.
	www.excelwater.com /eng/b2c/whatisro.php (394 words)

	REVERSE OSMOSIS TECHNICAL DESCRIPTION
		Thus, to reach the point at which osmosis stops for tapwater, a pressure of 10 PSI would have to be applied to the saline solution, and to stop osmosis in seawater, a pressure of 376 PSI would have to be applied to the seawater side of the membrane.
		To achieve Reverse Osmosis, the osmotic pressure must be exceeded, and to produce a reasonable amount of purified water, the osmotic pressure is generally doubled.
		Reverse Osmosis has proved to be the most reliable and cost effective method of desalinating water, and hence its use has become more and more widespread.
	www.get-inc.com /ROTechDisc.htm (1496 words)

	Reverse Osmosis (Site not responding. Last check: 2007-10-12)
		Reverse osmosis treatment reduces the concentration of dissolved solids, including a variety of ions and metals and very fine suspended particles such as asbestos, that may be found in water (see Table 1).
		The reverse osmosis, pressure is applied to the concentrated solution reversing the natural direction of flow, forcing water across the membrane from the concentrated solution into the more dilute solution.
		Although the reverse osmosis process is simple, a complete water treatment system is often complex, depending on the quality of the incoming water before treatment and the consumer’s needs.
	www.afreelink.com /reverse_osmosis.htm (3320 words)

	Reverse Osmosis
		In order to describe Reverse Osmosis, it is first necessary to explain the phenomenon of osmosis.
		Osmosis may be described as the physical movement of a solvent through a semi-permeable membrane based on a difference in chemical potential between two solutions separated by that semi-permeable membrane.
		Using reverse osmosis we are able to concentrate various solutes, either dissolved or dispersed, in a solution.
	www.geafiltration.com /html/technology/freverseosmosis.html (362 words)

	Reverse Osmosis Home
		Reverse osmosis is a water purification process that removes 95-99% of most water contaminants including microorganisms, organic compounds, and dissolved inorganic compounds. Contaminant concentrations in municipal water supplies have wide seasonal fluctuations.
		Osmosis is defined as the movement of a dilute solution through a semi-permeable membrane into a solution of higher concentration that tends to equalize the concentrations of the solutions on both sides of the membrane
		Reverse osmosis uses the concept of osmosis and applies pressure to the side of the membrane containing the concentrated solution, with the result that the fluid is forced through a specialized membrane.
	www.edstrom.com /Resources.cfm?doc_id=278 (378 words)

	Reverse Osmosis - What is R/O water?
		This is osmosis and the pressure on the "divider" the osmotic pressure.
		Osmosis in simplest terms is when pure water dilutes the mineral and salt rich water in order to equalize.
		That is reversing the process of osmosis as we know by nature and the basic principle of reverse osmosis.
	www.algone.com /reverse_osmosis.htm (592 words)

	FDA itg Page 1
		Reverse osmosis (RO) has been known for more than a century, but it did not become a commercial process until the early sixties when a special membrane was developed (1,2,3,4).
		Reverse osmosis is a process which uses a membrane under pressure to separate relatively pure water (or other solvent) from a less pure solution.
		The amount of dissolved solids in water produced by reverse osmosis is approximately a constant percentage of those in the feed water.
	www.fda.gov /ora/inspect_ref/itg/itg36.html (1407 words)

	Howstuffworks "How does reverse osmosis work?"
		According to Merriam-Webster's Collegiate Dictionary, osmosis is the "movement of a solvent through a semipermeable membrane (as of a living cell) into a solution of higher solute concentration that tends to equalize the concentrations of solute on the two sides of the membrane." That's a mouthful.
		The water pressure rises as the height of the column of salty water rises, until it is equal to the osmotic pressure.
		In reverse osmosis, the idea is to use the membrane to act like an extremely fine filter to create drinkable water from salty (or otherwise contaminated) water.
	www.howstuffworks.com /question29.htm (516 words)

	Reverse Osmosis
		Reverse Osmosis is a process that is often described as crossflow filtration and is used to remove a wide range of salts to give water of high purity.
		Osmosis is a natural process involving fluid flow across a semi-permeable membrane barrier.
		This effect is utilised in a Reverse Osmosis plant to allow water containing a high level of natural salts to be purified without the need for chemical regenerants and the inherent impilcations of handling hazardous substances.
	www.aquaflow.co.uk /reverse_osmosis/index.html (262 words)

	Reverse Osmosis
		Reverse Osmosis systems are recommended by the Centers for Disease Control and the EPA as one of the most effective ways of protecting residential drinking water!
		Pressure is applied to reverse the flow of water, the source of which is usually and existing, pressure is applied to the feed stream, water molecules are passed through the membrane, while salts are retained in the feed.
		Reverse osmosis system should be purchased by anyone who is concerned about the quality, taste, odor or levels of dissolved minerals in their drinking water.
	www.henrywaterfilters.com /osmosis.htm (680 words)

	Reverse Osmosis Devices
		Reverse osmosis is used to remove salts and other impurities from water in order to improve the color, taste or properties.
		Reverse osmosis uses a membrane that is semi-permeable, allowing water to pass through it, while rejecting the contaminants that remain.
		Frequently, mechanical and/or activated carbon filters are installed before the reverse osmosis unit to remove turbidity and improve taste and odor.
	www.co.el-dorado.ca.us /emd/envhealth/reverse_osmosis.html (484 words)

	Reverse Osmosis (Site not responding. Last check: 2007-10-12)
		Reverse Osmosis is a method of desalination which employs a semi-permeable membrane (usually a thin plastic film) to physically separate high quality water from water the contains salts and other types of impurities including micro-organisms.
		Where the rainfall is low or very seasonal reverse osmosis is a more reliable option and those that do not want to deal with and understand the technology involved can pay a person or a company to operate and maintain their plants.
		Reverse osmosis already provides water for the residents of Grand Cay, Moores Island, Black Point and Farmers Cay, and plans are being finalized for plants to be installed in Bimini, Long Island, San Salvador, Inagua, and Ragged Island.
	www.wsc.com.bs /REVERSEOSMOSIS.asp (1592 words)

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