Activated Charcoal Water Filter

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In this particular coffee maker, that is, KitchenAid KCM1202OB 12-Cup Glass Carafe Coffee Maker, a cartridge activated charcoal water filter is used to reduce the contaminants which can impair the flavour of the coffee1.

The separation of solids from a suspension in a liquid by means of a porous medium or which retains the solids and allows the liquid to flow through is termed as filtration. A water filter removes impurities from water by means of a fine physical barrier, a chemical or a biological process3.

Cartridge filters uses a barrier or sift method to remove sediment and harmful solids from liquid. A filter with activated charcoal is used to remove certain chemicals, in particular, organic chemicals, from water. At times, it is also used to remove chemicals that give objectionable odours or tastes to water, such as hydrogen sulphide or chlorine. There are two types of activated charcoal filter systems in use: Whole-House Filters or Point of Entry and Point of Use Filters. In this coffee maker, the filter system
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When the water is passed through the filter, the activated charcoal attracts and holds certain chemicals. The activated charcoal is a highly porous material, so it has an extremely high surface area for the adsorption of the contaminants. The equivalent surface area of 1 pound of activated charcoal ranges from 60 to 150 acres. The adsorption process depends on the following factors: the temperature and the pH of the water, the flow rate or time exposure of water to activated charcoal, chemical composition and concentration of the contaminant, and the physical properties of the activated charcoal; such as surface area and distribution of pore size. The most important process carried out by the activated charcoal filtration is the adsorption of the contaminants to the pore walls. The amount and distribution of pores determines how well the contaminants are
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