waste water treatment

    Cards (4)

    • when you flush water down the drain it goes into the sewers towards sewage treatment plants
    • agricultural systems produces lots of waste water, as well as industrial processes that has to be collected and treated
    • sewage from domestic or agricultural sources has to be treated to remove organic matter and harmful microbes before it can be put into seas
    • sewage treatment:
      1. screened - removing large bits of material
      2. sedimentation - heavier solids sink to produce sludge, lighter effluent floats to top
      3. sludge is removed and broken down by anaerobic digestion
      4. effluent is removed and treated by aerobic digestion
      5. additional stages for toxic may be radiation or chemicals
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