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Date Created: 12/20/15
Salt Removal Water Systems Everyone knows that salt water; sea water in particular cannot be drunk by humans. It is full of salt that normally dehydrates the body. However, with the aid of modern technology, salt can already be removed from liquid and transform it into fresh and drinkable water, this is possible with the use of a method called desalination. Desalination is a process wherein dissolved minerals like salt from brackish water, treated wastewater and even sea water can be removed. There are several technologies developed which are used for desalination which include reverse osmosis, electro dialysis, distillation as well as vacuum freezing. Reverse Osmosis Salt cannot be removed from water easily. Reverse osmosis is among the desalination process used in separating salt from water. It can effectively supply drinking water; however, it will not generate enough of it. There would only be around one gallon of water per hour for an RO system sized for household use. In a reverse osmosis process, the membrane serves as a fine filter for contaminated liquid to transform the salt water into potable one. The downside of reverse osmosis is that minerals are also filtered which is very important for health. The system also works slowly, although it can do the job effectively. Distillation Distillation is very ideal for filtering contaminated water because it can get rid of different kinds of impurities and contaminants which include fluoride, lead, chemicals, chlorine as well as organisms, hence, producing 99.9% pure water. Distillation is usually employed for commercial, scientific and industrial applications. Even in dental procedures, distilled water is used in patients for mouth rinsing. Water distillers are true and tried technologies that come in differences sizes and prices. You can find: Counter top units that can produce only one gallon a day. The floor models that generate and store around 10 gallons The automatic incline systems that have the capacity to continuously produce as well as store clean and drinkable water with the use of under sink reservoir. Just like the other desalination process, distillation also has its own downsides, perhaps the biggest one is the high cost of water per gallon. This is due to the high energy requirement during the process. For every five gallons of tap water, you will need approximately 2 to 5 hours of processing just to produce a gallon of distilled water. Aside from the cost in purchasing the unit, there is also round $0.25 of electrical cost per gallon. Distillation process for salt removal system may not be a good option in case of emergency preparedness because the water distiller will not work when power outage occurs. At present, there are only few desalination plants. They were constructed along the coastline of California. This limited number is due to the fact that the expenses on desalination process is usually higher compared to that of the other alternatives for water supply in California such as groundwater pumping and water transfer. But because of the occurrence of drought conditions, concerns regarding the availability of water continue to increase and the proposal of desalination projects are being brought up in several locations within the state. Vacuum Freezing Vacuum freezing, also known as freeze desalination is a method wherein the pressure and temperature of the seawater is reduced to produce ice crystals. After freezing, the ice is washed and then melted to produce pure water. The vacuum freezing is still being developed to make it more effective in the desalination process. The method uses the principle of freezing wherein salt is dissolved during freezing and the saline water is separated from the ice. First, the salt is cooled then sprayed in vacuum chamber using low pressure. The process will result in released vapors from the water thus eliminating more heat that in turn causes the ice formation. Because there is a lesser density of ice, it will flow on the salt water, then washed later with fresh water and melted. After this, the fresh water is then flushed out of the washer- melter. Electro dialysis is the process wherein salt ions are transported from one solution by means of ion exchange membranes, into another solution with the use of the applied electric potential difference. The process is done within a configuration referred to as electro dialysis cell. The cell is composed of a feed compartment for the dilute as well as a concentrate compartment for the brine, which are formed by the cation and anion exchange membranes that are placed in between the two electrodes. Mesin RO Murah
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