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Nanofiltration (NF) is a relatively recent membrane filtration process used most often with low total dissolved solids water such as surface water and fresh groundwater, with the purpose of softening (polyvalent cation removal) and removal of disinfection by-product precursors such as natural organic matter
What else can I help you with?
What is difference between nanofiltration and reverse osmosis?
There is none
What has the author Jukka Tanninen written?
Jukka Tanninen has written: 'Importance of charge in nanofiltration' -- subject(s): Chemical equilibrium, Membrane filtration, Nanofiltration, Purificaiton, Purification, Sewage, Water
By which process can we get soap from soap water?
One approach would be some kind of membrane process like ultra- or nanofiltration. The questions to answer first are: * How much water do you want to process? * Do you want the soap or the water? * What costs are acceptable? Membrane processes are physical pocesses, and they require substantial pressure to work.
What do ships do to make salt water into fresh water?
They have desalination equipment. Desalination can be done in several ways -- distillation, reverse osmosis, nanofiltration and others. I'm not sure if it still is but not long ago ships used multiple stage flash distilling units. Seawater is heated to about 170 degrees F and sprayed into a chamber that's at a vacuum. Some of the water flashes into vapor and is collected as distilled water, the remaining, now saltier, water is pumped to the next stage and the process repeated.
Name the methods of desalination of saline water?
Desalination of saline water primarily involves two methods: distillation and membrane processes. Distillation, including multi-stage flash and reverse osmosis, uses heat to evaporate water, leaving salts behind. Membrane processes, notably reverse osmosis, use semi-permeable membranes to separate salt from water under pressure. Other methods include electrodialysis and nanofiltration, which also aim to remove salts and impurities from seawater or brackish water.
What are nanofilters used for?
Contaminated water is a threat for us and many people die because of drinking of contaminated or dirty water. Many water borne diseases like diarrhea, cholera, typhoid etc. are caused by contaminated water usage, filtration is the way to reduce the risk and with the help of nanofilters it makes more simple for us to drink filtered and safe water. Nanofiltration is a very complex procedure. In short form, the liquid is passed through a membrane which separates impurities, membrane traps the unwanted material and only allows the liquid to pass through. Holes in the nanofilters are microscopic so they allow only liquid and some ions to pass through. Nanofiltration is also used for treatment of industrial wastes which can be contaminated with oils and even metals. Moreover the residue is also very useful and can be used as a fuel. Membrane of the nanofilters can be made using many materials depending upon what is to be filtered using it. The filtration using nanofilters can be used to recover polluted water supplies and can also be used to get over oil spills and other chemical spills. These nanofilters can also be used to create drinking water from sea water. Nanofilters can be used in ordinary and daily use filters. We can use these filters for drinking safe water at home, or carry these to camps so that we can also have safe water drinking options there also. Like any other filters nanofilters also need to be changed periodically over certain time because the microscopic holes become clogged as the use increases and by the time which slows down the filtration process and can also block it. This advanced and integrated filtration process by nanofilters is a boon for us that would prevent us from many diseases by contaminated drinking water and would also help in reducing further water pollution.
What did you know in the ways of separating mixture?
Methods of separation (list after Wikipedia)Centrifugationand cyclonic separation, separates based on density differencesChromatographyseparates dissolved substances by different interaction with (i.e., travel through) a materialCrystallizationDecantationDemister (vapor), removes liquid droplets from gas streamsDistillation, used for mixtures of liquids with different boiling pointsDrying, removes liquid from a solid by vaporisationElectrophoresis, separates organic molecules based on their different interaction with a gelunder an electric potential (i.e., different travel)ElutriationEvaporationExtractionLeachingLiquid-liquid extractionSolid phase extractionFlotationDissolved air flotation, removes suspended solids non-selectively from slurry by bubbles that are generated by air coming out of solutionFroth flotation, recovers valuable, hydrophobic solids by attachment to air bubbles generated by mechanical agitation of an air-slurry mixture, which float, and are recoveredDeinking, separating hydrophobic ink particles from hydrophilic paper pulp in paper recyclingFlocculation, separates a solid from a liquid in a colloid, by use of a flocculant, which promotes the solid clumping into flocsFiltration, Mesh, bag and paper filters are used to remove large particulates suspended in fluids (e.g., fly ash) while membrane processes including microfiltration, ultrafiltration, nanofiltration, reverse osmosis, dialysis (biochemistry) utilising synthetic membranes, separates micrometre-sized or smaller speciesFractional distillationFractional freezingOil-water separation, gravimetrically separates suspended oil droplets from waste water in oil refineries, petrochemical and chemical plants, natural gas processing plants and similar industriesMagnetic separationPrecipitationRecrystallizationSedimentation, separates using vocal density pressure differencesGravity separationSievingStrippingSublimationVapor-liquid separation, separates by gravity, based on the Souders-Brown equationWinnowingZone refining
What is tertiary treatment of waste water?
Around 85% of TSS, BOD, and some portion of phosphorus, heavy metal, and nitrogen from the wastewater is removed by secondary treatment. The third stage known as the tertiary treatment of the wastewater can remove the loads of phosphorous and nitrogen which is present in the water. They comprise processes like ion exchange, filtration, and absorption of activated carbon, nitrification, electrodialysis, and denitrification. In tertiary treatment, the options of treatment depend on the characteristics of effluent after the second treatment and the kind of water which is needed at the very end of the treatment. Like in the case of potable water, disinfection and filtration are to be done upon the wastewater. Filtration Process The process of filtration can take out the particulate matter by passing the water via the porous media. The process of filtration comprises several types of media which are mainly sand, charcoal, and gravel. There are mainly two types of filtration of sand, which are slow and rapid sand filtration. Membrane Process For treating a varied range of wastes that includes organic and inorganic matter, sewage, and water-soluble oil wastes, membrane technology is used. On the basis of the separation mechanism and driving force like Ultrafiltration (UF), Multi Filtration (MF), Reverse Osmosis (RO), Nanofiltration (NF), and Forward Osmosis (FO), the membrane processes are classified. Advanced Oxidation System For destroying the microorganisms in the process and degrading the organic pollutant, ozone is introduced. By passing the oxygen via a high voltage electric field, Ozone gas (O3) is formed. Presently, ozone is used widely as a disinfectant after chlorine.
How nanotechnology benefits the biodiversity?
Biodiversity means diversity among living beings, all living beings require 3 basic needs to live: Air, Water and Food. we found nutritional versatility and modes are different, now a days we all know three P means: Population, Pollution and Power are increasing day by day, we have to face so many problems because of them like- Climate Change, Energy scarcity ect.... so here nanotechnology and its fascinating applications come forward to solve such problems,1) Nanotechnology solve the Energy ProblemsWe all know nonrenewable energy sources are limited they will exhausted within few years apart from this their use also lead to pollution in environment which affect biodiversity of earth so here nanotechnology is boon for development or enhancement of new energy sources.Nanotechnology has made it possible for scientists to develop renewable energy sources that will not harm the environment any further, as they produce energy with low levels of toxic emission while at the same time affordable to many.1) Consider the possibility of having inexpensive solar power in the near future by using nanostructured solar cells. The use of the latter has made it possible for manufacturers to produce solar panels into flexible rolls using print-like processing that equates to lower costs and easier installations.2) Currently, researchers are into developing thin-film solar panels that fits into portable computer cases and mobile electronic devices or be woven into flexible nanowires and attached to garments as a means for generating usable energy, either from natural light, from friction or from one's own body heat while on the go.3) Nano-bioengineering researches and development are also currently aimed at enabling enzymes to convert cellulose, wood chips, cornstalks and organic perennial grasses into ethanol fuel.4) Moreover, researchers are onto the possibility of converting heat wastes into usable energy power as they are generated by computers, vehicles, homes, factories, power plants and the like. They are generated by computers, vehicles, homes, factories, power plants and the like.5) Windmill blades are being developed into lightweight nanostructures that are stronger than the ordinary blades with the capacity to increase the amount of electricity generated.6) Other developments for nanowires are for their utilization in electric grids by adding carbon nanotubes to create lower resistance. This then will result to the reduction of power that is lost while energy is being transmitted to power lines.Nanotechnology for Waste Water treatment and remediationContaminated waste water also affects biodiversity and also ecology of the water system. Because waste water contain so many impurities like Organic Dyes, Harmful Microorganisms, Heavy metals etc.. Clean and pure water is basic need for all purposes like for Drinking, Domestic Uses, Industrial Uses etc.A strong influence of nanochemistry on waste-water treatment, air purification and energy storage devices is to be expected.Mechanical or chemical methods can be used for effective filtration techniques. One class of filtration techniques is based on the use of membranes with suitable hole sizes, whereby the liquid is pressed through the membrane.Nanoporous membranes are suitable for a mechanical filtration with extremely small pores smaller than 10 nm ("nanofiltration") and may be composed of nanotubes. Nano filtration is mainly used for the removal of ions or the separation of different fluids.Nanoparticles are also harmful to biodiversityNanotoxicityNanoparticles may be inhaled, ingested or taken in through contact with the skin. The known possible adverse health impacts are summarized in below which includes both natural and anthropogenic nanoparticles. Obviously not all nanoparticles are harmful, but without exhaustive tests especially in the case ofthe newly engineered nanoparticles, it is impossible to tellMagnetic nanoparticles offer an effective and reliable method to remove heavy metal contaminants from waste water by making use of magnetic separation techniques. Using nanoscale particles increases the efficiency to absorb the contaminants and is comparatively inexpensive compared to traditional precipitation and filtration methods.Nanotechnology for oil recovery to save Ecosystem and BiodiversityOil spills from container ships or offshore platforms are a frequent hazard to marine and coastal ecosystems and an expensive one to clean up. BP expects the Gulf of Mexico oil spill in 2010 -- the worst environmental disaster in U.S. history -- to cost it $40 billion.On it's own, oil is not magnetic, but MIT researchers say that when mixed with water-repellent nanoparticles that contain iron, the oil can be magnetically separated from the water. The nanoparticles can later be removed to enable the re-use of the oil.Numerous solutions have been proposed for dealing with the problem of oil spills. These includeØ Use of microorganisms to digest the oilØ Mechanical means like skimmers, booms, pumps, mechanical separators etc.Ø Sorbents to remove oil from water through adsorption and/or absorption andØ Use of chemical dispersants like detergents etc.Conventional techniques are not adequate to solve the problem of massive oil spills. In recent years, nanotechnology has emerged as a potential source of novel solutions to many of the world's outstanding problems.Although the application of nanotechnology for oil spill cleanup is still in its nascent stage, it offers great promise for the future. In the last couple of years, there has been particularly growing interest worldwide in exploring ways of finding suitable solutions to clean up oil spills through use of nanomaterials.Given the unique features of nanomaterials, there is a need for the development and implementation of appropriate and fit for purpose scientific approaches. This philosophy is based on the following:1) The marine environment is likely to be a sink for nanomaterials as it is for most man-made pollutants; it is therefore possible that certain nanomaterials may bio-accumulate and bio-magnify along the marine trophic chain, thus potentially affecting marine biological resources (wild and farmed);2) Nanomaterials may be transferred to humans through diet by consumption of contaminated seafood products;3) Nanomaterials may lead to a deterioration in marine environmental quality (coastal areas including natural and recreational interests) with social and economic repercussions.4) Some nanomaterials can, however, be used to reduce marine pollution, through selected applications, such as for instance through remediation by binding and removing specific contaminants.
