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  2. Media filter - Wikipedia

    en.wikipedia.org/wiki/Media_filter

    Municipal drinking water systems often use a rapid sand filter and/or a slow sand filter for purification. Silica sand is the most widely used medium in such filters. [1] Anthracite coal, garnet sand, ilmenite, granular activated carbon, manganese green sand and crushed recycled glass are among the alternative filter media used. [2]

  3. Greensand - Wikipedia

    en.wikipedia.org/wiki/Greensand

    Greensand glauconite is used as a water softener for its chemical-exchange properties. Greensand coated with manganese oxide (called manganese greensand) is used in well water treatment systems to remove dissolved (reduced) iron and manganese with the addition of an oxidant, usually potassium permanganate, under controlled pH conditions. [14]

  4. Iron-oxidizing bacteria - Wikipedia

    en.wikipedia.org/wiki/Iron-oxidizing_bacteria

    The anoxygenic phototrophic iron oxidation was the first anaerobic metabolism to be described within the iron anaerobic oxidation metabolism. The photoferrotrophic bacteria use Fe 2+ as electron donor and the energy from light to assimilate CO 2 into biomass through the Calvin Benson-Bassam cycle (or rTCA cycle) in a neutrophilic environment (pH 5.5-7.2), producing Fe 3+ oxides as a waste ...

  5. Manganese - Wikipedia

    en.wikipedia.org/wiki/Manganese

    Manganese is a key component of low-cost stainless steel. [ 73 ] [ 74 ] Often ferromanganese (usually about 80% manganese) is the intermediate in modern processes. Small amounts of manganese improve the workability of steel at high temperatures by forming a high-melting sulfide and preventing the formation of a liquid iron sulfide at the grain ...

  6. Rapid sand filter - Wikipedia

    en.wikipedia.org/wiki/Rapid_sand_filter

    Rapid sand filter. The rapid sand filter or rapid gravity filter is a type of filter used in water purification and is commonly used in municipal drinking water facilities as part of a multiple-stage treatment system. [ 1] These systems are complex and expensive to operate and maintain, and therefore less suitable for small communities and ...

  7. Biofilter - Wikipedia

    en.wikipedia.org/wiki/Biofilter

    A biofilter is a bed of media on which microorganisms attach and grow to form a biological layer called biofilm. Biofiltration is thus usually referred to as a fixed–film process. Generally, the biofilm is formed by a community of different microorganisms ( bacteria, fungi, yeast, etc.), macro-organisms ( protozoa, worms, insect's larvae, etc ...

  8. Obamacare's Medicaid Expansion Is Helping The Uninsured ...

    data.huffingtonpost.com/2015/10/obamacares...

    As a consequence, a two-tiered health care system is taking deeper root in America. In mainly Republican-led, Southern states, the uninsured rate remains disproportionately high. In sharp contrast, the ranks of the uninsured are falling sharply in states — most run by Democrats — that expanded Medicaid. Obamacare’s Medicaid Expansion Spreads

  9. Glauconite - Wikipedia

    en.wikipedia.org/wiki/Glauconite

    Glauconite. Glauconite is an iron potassium phyllosilicate ( mica group) mineral of characteristic green color which is very friable [ 5] and has very low weathering resistance. It crystallizes with a monoclinic geometry. Its name is derived from the Greek glaucos ( γλαυκός) meaning 'bluish green', referring to the common blue-green ...

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