GREENWATERCONCEPTS 5a2a4b8be9ea0107781bd373 False 398 48
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Iron removal media - Purolite MZ10 plus Aventura in association with Purolite, a premier manufacturer of resins from USA, offers iron removal media MZ10 Plus. The dark-to-black colored catalytic media can remove soluble iron, manganese, hydrogen sulfide, arsenic and radium from water supplies. For drinking water applications the media can be effective for over 10 years. Advantages over the existing iron removal media - Can take max iron concentrations up to 20ppm - Can reduce iron, Mn and H2S up to< 0.1 ppm- - No limitation of alkalinity and TDS inwater - Needs only periodic backwash with treated water - Can be operated at high temperatures and high differential pressures without breakdown ofmedia - No pre-treatment required to remove chlorine in feed water - Used with chlorine, the media offers excellent resistance to biological contamination - NSF approved Green Water Concepts India Pvt Ltd is one the major supplier of Purolite MZ 10 plus media across India
Iron Removal Media - Katalox Light Introduction Media Description High content (10percent) gamma Manganese dioxide (MnO2) coated ZEOSORB Katalox-Light Removal methods: 1. Mechanical Filtration (fine particles, TSS, Turbidity etc.) 2. Catalytic precipitation and sorption (Fe, Mn, Cu, Pb etc.) 3. Adsorbtion (flocculant formation and adsorption of As, Heavy Metals, Radionuclides) Filtration (≤ 3 µm) of: ♦ Total Suspended Solids ♦ Sediments ♦ Turbidity ♦ Organics ♦ Colour (some, organic) ♦ Odour Removal of: ♦ Iron (Inlet conc. up to. 100 mg/L) ♦ Manganese (Inlet conc. up to 20 mg/L) ♦ Arsenic ♦ Hydrogen Sulfide ♦ Uranium, Radium ♦ Heavy Metals ♦ Radionuclide Green Water Concepts India Pvt Ltd is one of the leading supplier of Katalox Light Media in India.
Iron Removal Plants Iron removal plants can be based on different filtration media, depending on the iron and manganese concentration, the oxygen level, CO2 content and hardness of the water. Plant principle: First, air is injected in order to oxidize the iron. The oxidized iron will then precipitate on a sand filter. An MnO2 layer in the sand bed will catalyze the oxidation of residual iron. Backwash will be done by water and by air. More on iron removal principles Iron removal plant flow diagram:
Chemistry of Iron removal from drinking water. Iron Removal by physical-chemical ways Iron is one of the most abundant metals of the Earth's crust. It occurs naturally in water in soluble form as the ferrous iron (bivalent iron in dissolved form Fe2+ or Fe(OH)+) or complexed form like the ferric iron (trivalent iron: Fe3+ or precipitated as Fe(OH)3). The occurrence of iron in water can also have an industrial origin ; mining, iron and steel industry, metals corrosion, etc. In general, iron does not present a danger to human health or the environment, but it brings unpleasantness of an aesthetic and organoleptic nature. Indeed, iron gives a rust color to the water, which can stain linen, sanitary facilities or even food industry products. Iron also gives a metallic taste to water, making it unpleasant for consumption. It can also be at the origin of corrosion in drains sewers, due to the development of microorganisms, the ferrobacteries. In aerated water, the redox potential of the water is such as it allows an oxidation of the ferrous iron in ferric iron which precipitates then in iron hydroxide, Fe(OH)3, thus allowing a natural removal of dissolved iron. 4 Fe2+ 3 O2 --> 2 Fe2O3 Fe2O3 + 3 H2O --> 2Fe(OH)3 The form of iron in water depends on the water pH and redox potential, as shown in the Pourbaix diagram of Iron below. Usually groundwater has a low oxygen content, thus a low redox potential and low pH (5.5- 6.5) However ground waters are naturally anaerobic: so iron remains in solution and therefore it is important to remove it for a water use. The elimination of the ferrous iron, by physical-chemical way, is obtained by raising the water redox potential by oxidation thanks to oxygen of the air and this by simple ventilation. In the case of acid water, the treatment could be supplemented by a correction of the pH. Thus, the ferrous iron is oxidized in ferric iron, which precipitates in iron hydroxide, Fe(OH)3. The precipitate is then separated from water by filtration on sand or decantation. The stage of precipitation by chemical oxidation can also be carried out with the stronger oxidants such as the chlorine dioxide (ClO2), ozone (O3) or the potassium permanganate (KMnO4). This elimination can be carried out by cascade or spraying open-air systems (for an acceptable maximum content of Fe2+ of 7mg.L-1) known as gravitating systems. Those systems require a significant place on the ground, but, in addition to an easy and a cheap exploitation cost, they also make possible aggressive CO2 and hydrogen sulfide (H2S) removal. There are also pressure systems, which in addition to their compactness, make possible to treat water whose Fe2+ concentrations between 7 and 10mg.L-1. Iron is often found in water in complexed forms. In order to be eliminated, iron complexed requests a coagulation stage, which comes in between oxidation and filtration. Remark : Thanks to microorganisms, it is possible to remove iron from water by biological way. Indeed, there are many bacteria, whose metabolism and thus their survival, are related to the oxidation of iron. However this biological removal requires conditions specific for the pH, the temperature, the redox potential, etc
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