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  2. Decentralized wastewater system - Wikipedia

    en.wikipedia.org/.../Decentralized_wastewater_system

    Constructed wetland for decentralized wastewater treatment at a school in Lusaka, Zambia. Decentralized wastewater systems (also referred to as decentralized wastewater treatment systems) convey, treat and dispose or reuse wastewater from small and low-density communities, buildings and dwellings in remote areas, individual public or private properties. [1]

  3. London sewer system - Wikipedia

    en.wikipedia.org/wiki/London_sewer_system

    Smaller sewage treatment plants also serve areas further away from central London, such as at Mogden and Edmonton. During the 20th century, major improvements were made to the sewerage system and to the sewage treatment provision to substantially reduce pollution of the Thames Estuary and the North Sea.

  4. 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.

  5. Trickling filter - Wikipedia

    en.wikipedia.org/wiki/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. Waste stabilization pond - Wikipedia

    en.wikipedia.org/wiki/Waste_stabilization_pond

    In the treatment of sewage, systems composed of anaerobic ponds followed by facultative ponds usually have overall BOD removal efficiencies between 75 and 85%. Higher efficiencies are difficult to achieve because the effluent contains high concentrations of particulate organic matter, in the form of algae, naturally produced during treatment.

  7. Industrial wastewater treatment - Wikipedia

    en.wikipedia.org/.../Industrial_wastewater_treatment

    Industrial facilities may generate the following industrial wastewater flows: [citation needed] Manufacturing process wastestreams, which can include conventional pollutants (i.e. controllable with secondary treatment systems), toxic pollutants (e.g. solvents, heavy metals), and other harmful compounds such as nutrients

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