Desalination

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The theoretical energy efficiency of this method is on par with electrodialysis and reverse osmosis. Desalination is particularly relevant in dry countries such as Australia , which traditionally have relied on collecting rainfall behind dams for water. Education research and development is conducted in collaboration with state and national education bodies to improve policy, curriculum, teaching effectiveness and student learning outcomes. Freeze-thaw desalination uses freezing to remove fresh water from salt water. The resulting condensate is purified water. Research in this area is identifying biomarkers to assist in patient monitoring, treatment decisions, allowing better patient prognosis.

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Connecting a thermal desalination technology such as membrane distillation system to the diesel engine exhaust repurposes this low-grade heat for desalination. The system actively cools the diesel generator , improving its efficiency and increasing its electricity output.

This results in an energy-neutral desalination solution. Originally stemming from ocean thermal energy conversion research, low-temperature thermal desalination LTTD takes advantage of water boiling at low pressure, even at ambient temperature. This water is pumped through coils to condense the water vapor.

The resulting condensate is purified water. LTTD may take advantage of the temperature gradient available at power plants, where large quantities of warm wastewater are discharged from the plant, reducing the energy input needed to create a temperature gradient. Experiments were conducted in the US and Japan to test the approach. In Japan, a spray-flash evaporation system was tested by Saga University. In October , Saltworks Technologies announced a process that uses solar or other thermal heat to drive an ionic current that removes all sodium and chlorine ions from the water using ion-exchange membranes.

The Seawater greenhouse uses natural evaporation and condensation processes inside a greenhouse powered by solar energy to grow crops in arid coastal land. Adsorption-based desalination AD relies on the moisture absorption properties of certain materials such as Silica Gel. One process was commercialized by Modern Water PLC using forward osmosis , with a number of plants reported to be in operation. The idea of the method is in the fact that when the hydrogel is put into contact with aqueous salt solution, it swells absorbing a solution with the ion composition different from the original one.

This solution can be easily squeezed out from the gel by means of sieve or microfiltration membrane. The compression of the gel in closed system lead to change in salt concentration, whereas the compression in open system, while the gel is exchanging ions with bulk, lead to the change in the number of ions. The consequence of the compression and swelling in open and closed system conditions mimics the reverse Carnot Cycle of refrigerator machine.

The only difference is that instead of heat this cycle transfers salt ions from the bulk of low salinity to a bulk of high salinity. Similarly to the Carnot cycle this cycle is fully reversible, so can in principle work with an ideal thermodynamic efficiency. Because the method is free from the use of osmotic membranes it can compete with reverse osmosis method.

In addition, unlike the reverse osmosis, the approach is not sensitive to the quality of feed water and its seasonal changes, and allows the production of water of any desired concentration. In this approach, a solar thermal collector measuring two square metres can distill from 40 to 60 litres per day from any local water source — five times more than conventional stills. It eliminates the need for plastic PET bottles or energy-consuming water transport. Salty groundwater in the region would be treated to become freshwater, and in areas near the ocean, seawater could be treated.

The Passarell process uses reduced atmospheric pressure rather than heat to drive evaporative desalination. The pure water vapor generated by distillation is then compressed and condensed using an advanced compressor. The compression process improves distillation efficiency by creating the reduced pressure in the evaporation chamber. The compressor centrifuges the pure water vapor after it is drawn through a demister removing residual impurities causing it to compress against tubes in the collection chamber.

The compression of the vapor increases its temperature. The heat is transferred to the input water falling in the tubes, vaporizing the water in the tubes. Water vapor condenses on the outside of the tubes as product water. By combining several physical processes, Passarell enables most of the system's energy to be recycled through its evaporation, demisting, vapor compression, condensation, and water movement processes.

Geothermal energy can drive desalination. In most locations, geothermal desalination beats using scarce groundwater or surface water, environmentally and economically. Nanotube membranes of higher permeability than current generation of membranes may lead to eventual reduction in the footprint of RO desalination plants.

It has also been suggested that the use of such membranes will lead to reduction in the energy needed for desalination. Hermetic, sulphonated nano-composite membranes have shown to be capable of removing a various contaminants to the parts per billion level. Biomimetic membranes are another approach. In , Siemens Water Technologies announced technology that applied electric fields to desalinate one cubic meter of water while using only a purported 1.

If accurate, this process would consume one-half the energy of other processes. A process employing electrokinetic shocks waves can be used to accomplish membraneless desalination at ambient temperature and pressure. Calcium and carbonate ions react to form calcium carbonate , which precipitates, leaving fresh water.

The theoretical energy efficiency of this method is on par with electrodialysis and reverse osmosis. Micro desalination plants operate near almost every natural gas or fracking facility found in the United States.

Evaporation of water over the oceans in the water cycle is a natural desalination process. The formation of sea ice produces ice with little salt, much lower than in seawater. Seabirds distill seawater using countercurrent exchange in a gland with a rete mirabile.

The gland secretes highly concentrated brine stored near the nostrils above the beak. The bird then "sneezes" the brine out. As freshwater is not usually available in their environments, some seabirds, such as pelicans , petrels , albatrosses , gulls and terns , possess this gland, which allows them to drink the salty water from their environments while they are far from land.

Mangrove trees grow in seawater; they secrete salt by trapping it in parts of the root, which are then eaten by animals usually crabs. Additional salt is removed by storing it in leaves that fall off. Some types of mangroves have glands on their leaves, which work in a similar way to the seabird desalination gland. Salt is extracted to the leaf exterior as small crystals , which then fall off the leaf. Willow trees and reeds absorb salt and other contaminants, effectively desalinating the water.

This is used in artificial constructed wetlands , for treating sewage. Desalination has been known to history for millennia as both a concept, and later practice, though in a limited form. Before the Industrial Revolution, desalination was primarily of concern to oceangoing ships, which otherwise needed to keep on board supplies of fresh water.

When Protector frigate was sold to Denmark in the s as the ship Hussaren the desalination plant was studied and recorded in great detail. It was merged into the Office of Water Resources Research in Research also took place at state universities in California, followed by development at the Dow Chemical Company and DuPont.

From Wikipedia, the free encyclopedia. This article is about removing salt from water. For soil desalination, see Soil salinity control. This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.

January Learn how and when to remove this template message. Retrieved August 19, Retrieved September 5, Archived from the original on February 2, Retrieved January 25, Membranverfahren - Grundlagen der Modul und Anlagenauslegung. Sabine Lattemann, Thomas Höppner. Journal of Membrane Science.

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