Nano filtration is a pressure driven filtration process where mixture water passes through a membrane by the application of a gravity or pressure. High removal of divalent ions (calcium, magnesium, arsenic, iron, sulphate) and low removal of monovalent ions (sodium, potassium, chloride) can be achieved in Nano filtration process. Nano filtration membranes can be used in desalination, organic matter and iron removal from surface water (Bartels et. al., 2007).
A number of problems such as membrane fouling, corrosion and scaling are caused by suspended solids, organic and inorganic materials in the feed water. Membrane fouling due to high levels of organic compounds in water can change permeability of Nano filtration membrane affecting water quality and operating cost (Bartels, et. al., 2007). Membrane bio fouling, growth of micro-organisms on a membrane, is a serious challenge causing technical problems (Ivnitsky et. al., 2005). According to Ivnitsky et. al. (2005) microbes such as Flavobacterium species,
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