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![]() The impurity molecules are held within the carbon’s internal pore structure by electrostatic attraction (Van der Waals forces) also known as Chemisorption. Adsorbed particles become attached to the surface of a given media, becoming a film of weakly held part of the solid. In most cases, adsorbed particles are affected by weak chemical interactions that allow them to adhere to the surface of a solid. In the case of water filtration, the suspended solid particles present in liquid will adhere to the media solid surface.Īdsorption differs from occlusion in that occluded particles are removed from a process flow because they are, where occlusion is the result of particles being too large to pass through a physical restriction in the media. Adsorption is the adhesion of atoms, ions, or molecules from a gas, liquid, or solid to a surface. A water-born, suspended particle adheres to a solid surface when adsorption occurs. Adsorption refers to the removal of an impurity from a liquid to the surface of a solid. “Adsorption” is one of the most frequently used but least understood terms in discussions of filtration. ![]() Filtration systems remove particulate matter and, because of the large surface area of filter media, they also can be used to drive chemical reactions that result in the removal of several contaminants. These advances have allowed water treatment specialists to optimize the removal of impurities from the water. Some of the equipment used to employ these mechanisms has have changed dramatically over time.The fundamental physical and chemical mechanisms that occur during filtration have become better understood over the years. Depending on the impurity impurities and the media, several different physical and chemical mechanisms are active in removing are responsible for the removal of impurities from the water. As the water passes through the media, the impurities are held in the filter media material. This is achieved by passing the dirty input water (influent) through a filter media. Many water filter systems use both carbon block & GAC filters in the water filtration process.Ĭeltic Water Solutions supplies a wide range of carbon filters which can be used in reverse osmosis water filtration systems or 10” or 20” filter housings.Filtration Theory: For thousands of years filtration has been used to reduce the level of dirt, rust, suspended matter and other impurities from water. GAC filters also have very high adsorption properties and can remove contaminants including chlorine, volatile organic compounds pesticides, hydrogen sulphide, nitrates and much more. Water flows more freely through this stage, so flow rates are higher for GAC filters than carbon block filters. GAC Filters – The granular activated carbon or GAC water filter is made of loose carbon granules.Carbon block water filters are extremely effective in filtering out a variety of contaminants including chlorine, sediments as well as pesticides, and heavy metals. Water will generally flow slower during this filtration stage due to the compact nature of the compressed carbon. Carbon Block Filters – Carbon block filters are made of a solid block of compressed carbon and are often used as a pre-filter in reverse osmosis and other water filtration systems.These are the carbon block filter and the granular activated carbon filter (GAC). ![]() There are two main types of carbon water filters. Adsorption means that contaminants are attracted to the surface of the activated carbon and held to it, much the same way a magnet attracts and holds iron fillings. Carbon filters for water filtration are produced by grinding up a carbon source which could be based on coconut, coal, or wood.Ĭarbon filters remove contaminants through adsorption. Carbon filters are an excellent choice for the removal of chlorine, taste and odour, or organics in water. ![]()
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