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  2. Denitrification - Wikipedia

    en.wikipedia.org/wiki/Denitrification

    It is also an instrumental process in constructed wetlands [28] and riparian zones [29] for the prevention of groundwater pollution with nitrate resulting from excessive agricultural or residential fertilizer usage. [30] Wood chip bioreactors have been studied since the 2000s and are effective in removing nitrate from agricultural run off [31 ...

  3. Central Valley groundwater pollution - Wikipedia

    en.wikipedia.org/wiki/Central_Valley_groundwater...

    Women who consume water with nitrates over 5 mg/L are at a higher risk of developing thyroid cancer. [25] This 5 mg/L level is 5 mg below the federally accepted limit. When consumed, nitrate can compete with iodine in the body to be taken up by the thyroid. When the thyroid intakes nitrogen instead of iodine, its function may be impaired. [26]

  4. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water. The goal is to produce water that is fit for specific purposes. The goal is to produce water that is fit for specific purposes.

  5. Nitrate - Wikipedia

    en.wikipedia.org/wiki/Nitrate

    In natural waters, inevitably contaminated by microorganisms, nitrate is a quite unstable and labile dissolved chemical species because it is metabolised by denitrifying bacteria. Water samples for nitrate/nitrite analyses need to be kept at 4 °C in a refrigerated room and analysed as quick as possible to limit the loss of nitrate.

  6. Drinking water quality in the United States - Wikipedia

    en.wikipedia.org/wiki/Drinking_water_quality_in...

    Drinking water quality in the United States is generally safe. In 2016, over 90 percent of the nation's community water systems were in compliance with all published U.S. Environmental Protection Agency (US EPA) standards. [1] Over 286 million Americans get their tap water from a community water system.

  7. Water filter - Wikipedia

    en.wikipedia.org/wiki/Water_filter

    A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools.

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