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2. Total dissolved solids - Wikipedia

   en.wikipedia.org/wiki/Total_dissolved_solids

   14] Water can be classified by the level of total dissolved solids (TDS) in the water: Fresh water: TDS is less than 1,000 ppm. Brackish water: TDS = 1,000 to 10,000 ppm. Saline water: TDS = 10,000 to 35,000 ppm. Hypersaline: TDS greater than 35,000 ppm. Drinking water generally has a TDS below 500 ppm.

3. Water injection (oil production) - Wikipedia

   en.wikipedia.org/wiki/Water_injection_(oil...

   In the oil industry, waterflooding or water injection is where water is injected into the oil reservoir, to maintain the pressure (also known as voidage replacement), or to drive oil towards the wells, and thereby increase production. Water injection wells may be located on- and offshore, to increase oil recovery from an existing reservoir.

4. Produced water - Wikipedia

   en.wikipedia.org/wiki/Produced_water

   A shale gas well being drilled by a drilling rig in Pennsylvania. Produced water is a term used in the oil industry or geothermal industry to describe water that is produced as a byproduct during the extraction of oil and natural gas, [1] or used as a medium for heat extraction.

5. Exemptions for fracking under United States federal law

   en.wikipedia.org/wiki/Exemptions_for_fracking...

   Many oil and gas companies contend that the regulations currently in place are sufficient. The June 2015 draft report of an ongoing EPA study on fracking effects on drinking water listed a number of mechanisms by which fracking can degrade drinking water. The draft report noted among its major findings:

6. Los Angeles set to build facility to transform wastewater ...

   www.aol.com/news/los-angeles-set-build-facility...

   The drinking water that the plant produces will be piped 10 miles northeast to L.A. County’s Hansen Spreading Grounds, where it will flow into basins and percolate into the groundwater aquifer ...

7. Dissolved air flotation - Wikipedia

   en.wikipedia.org/wiki/Dissolved_air_flotation

   Dissolved air flotation (DAF) is a water treatment process that clarifies wastewaters (or other waters) by the removal of suspended matter such as oil or solids. The removal is achieved by dissolving air in the water or wastewater under pressure and then releasing the air at atmospheric pressure in a flotation tank basin. The released air forms ...

8. Initial test finds ‘forever chemical’ in Mount Rushmore ...

   www.aol.com/initial-test-finds-forever-chemical...

   A 2023 test of Mount Rushmore’s drinking water showed a PFOS concentration of 9.8 parts per trillion, more than two times higher than the Environmental Protection Agency’s new limit of 4 parts ...

9. Oil production plant - Wikipedia

   en.wikipedia.org/wiki/Oil_production_plant

   An oil production plant is a facility which processes production fluids from oil wells in order to separate out key components and prepare them for export. Typical oil well production fluids are a mixture of oil, gas and produced water. An oil production plant is distinct from an oil depot, which does not have processing facilities.