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  2. Media filter - Wikipedia

    en.wikipedia.org/wiki/Media_filter

    Media filter system for urban runoff. 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 ...

  3. HEPA - Wikipedia

    en.wikipedia.org/wiki/HEPA

    HEPA filters, as defined by the United States Department of Energy (DOE) standard adopted by most American industries, remove at least 99.97% of aerosols 0.3 micrometers (μm) in diameter. [24] The filter's minimal resistance to airflow, or pressure drop, is usually specified around 300 pascals (0.044 psi) at its nominal volumetric flow rate. [7]

  4. Median filter - Wikipedia

    en.wikipedia.org/wiki/Median_filter

    The median filter operates by considering a local window (also known as a kernel) around each pixel in the image. The steps for applying the median filter are as follows: Window Selection: Choose a window of a specific size (e.g., 3x3, 5x5) centered around the pixel to be filtered.

  5. Trickling filter - Wikipedia

    en.wikipedia.org/wiki/Trickling_filter

    Trickling filter. A trickling filter is a type of wastewater treatment system. It consists of a fixed bed of rocks, coke, gravel, slag, polyurethane foam, sphagnum peat moss, ceramic, or plastic media over which sewage or other wastewater flows downward and causes a layer of microbial slime (biofilm) to grow, covering the bed of media.

  6. Mechanical filter (respirator) - Wikipedia

    en.wikipedia.org/wiki/Mechanical_filter_(respirator)

    P100 filters, under 42 CFR part 84, are the only filters permitted to be magenta in color. [27] HE (high-efficiency) labeled filters are only provided for powered air-purifying respirators. HE-marked filters are 99.97% efficient against 0.3 micron particles and are oil-proof. [28] [29] [30]

  7. Microfiltration - Wikipedia

    en.wikipedia.org/wiki/Microfiltration

    Microfiltration. Microfiltration is a type of physical filtration process where a contaminated fluid is passed through a special pore-sized membrane filter to separate microorganisms and suspended particles from process liquid. It is commonly used in conjunction with various other separation processes such as ultrafiltration and reverse osmosis ...

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