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  2. Water chlorination - Wikipedia

    en.wikipedia.org/wiki/Water_chlorination

    The chlorination of the water supply helped stop the epidemic and as a precaution, the chlorination was continued until 1911 when a new water supply was commissioned. [7] Manual Control Chlorinator for the liquefaction of chlorine for water purification, early 20th century. From Chlorination of Water by Joseph Race, 1918.

  3. Backflow prevention device - Wikipedia

    en.wikipedia.org/wiki/Backflow_prevention_device

    In water distribution systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture. Water pressure may fail or be reduced when a water main bursts, pipes freeze, or there is unexpectedly high demand on the water system (for example, when several fire hydrants are opened).

  4. Effluent decontamination system - Wikipedia

    en.wikipedia.org/wiki/Effluent_Decontamination...

    A batch Effluent Decontamination System. An effluent decontamination system (EDS) is a device, or suite of devices, designed to decontaminate or sterilise biologically active or biohazardous materials in fluid and liquid waste material.

  5. In situ chemical reduction - Wikipedia

    en.wikipedia.org/wiki/In_situ_chemical_reduction

    The surface reactions take three different forms: direct reduction, electron shunting through ferrous iron, and reduction by production and reaction of hydrogen. Pathway A represents direct electron transfer (ET) for Fe 0 to the adsorbed halocarbon (RX) at the metal/water point of contact, resulting in dechlorination and production of Fe 2+.

  6. Chloramination - Wikipedia

    en.wikipedia.org/wiki/Chloramination

    Chloramination is the treatment of drinking water with a chloramine disinfectant. [1] Both chlorine and small amounts of ammonia are added to the water one at a time which react together to form chloramine (also called combined chlorine), a long lasting disinfectant. Chloramine disinfection is used in both small and large water treatment plants.

  7. Upper Occoquan Sewage Authority - Wikipedia

    en.wikipedia.org/wiki/Upper_Occoquan_Sewage...

    The UOSA plant is relatively unique in that the highly treated output from the plant supplies roughly 20% of the inflow into the Occoquan Reservoir, which provides drinking water used by the Fairfax County Water Authority. During drought periods the plant may briefly provide up to 90% of the reservoir inflow.

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