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2. 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]

3. Iron-oxidizing bacteria - Wikipedia

   en.wikipedia.org/wiki/Iron-oxidizing_bacteria

   Any previously precipitated iron is removed by simple mechanical filtration. Several different filter media may be used in these iron filters, including manganese greensand, Birm, MTM, multi-media, sand, and other synthetic materials. In most cases, the higher oxides of manganese produce the desired oxidizing action.

4. Media filter - Wikipedia

   en.wikipedia.org/wiki/Media_filter

   Media filters are used to protect water quality in streams, rivers, and lakes. They can be effective at removing pollutants in stormwater such as suspended solids and phosphorus. Sand is the most common filter material. [ 3][ 4] In other filters, sometimes called "organic filters," wood chips or leaf mold may be used. [ 5]

5. Manganese - Wikipedia

   en.wikipedia.org/wiki/Manganese

   Manganese is a chemical element; it has symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese was first isolated in the 1770s. Manganese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels.

6. Backwashing (water treatment) - Wikipedia

   en.wikipedia.org/wiki/Backwashing_(water_treatment)

   Backwashing is a form of preventive maintenance so that the filter media can be reused. In water treatment plants, backwashing can be an automated process that is run by local programmable logic controllers (PLCs). The backwash cycle is triggered after a set time interval, when the filter effluent turbidity is greater than a treatment guideline ...

7. Voter registration scams are now everywhere. Here's how to ...

   www.aol.com/news/voter-registration-scams-now...

   August 11, 2024 at 11:07 AM. Scams asking people for personal information to fix their voter registration are rising. Bloomberg Creative/Getty Images. Officials are warning about voter ...

8. Sand filter - Wikipedia

   en.wikipedia.org/wiki/Sand_filter

   Sand filter. Sand filter used for water treatment. Sand filters are used as a step in the water treatment process of water purification . There are three main types; rapid (gravity) sand filters, upward flow sand filters and slow sand filters. All three methods are used extensively in the water industry throughout the world.

9. 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 ...