Sewage Treatment

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5 Terms

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Method for sewage treatment

  1. Water is passed through a mesh to remove large substances and grit

  2. Water is allowed to settle in large sedimentation tanks, causing it to form liquid effluent and semi-solid sludge

  3. The sludge sinks and is taken away to be digested by anaerobic bacteria

    In the absence of oxygen, anaerobic bacteria digest sludge into biogas used for energy

    At the end, digested sludge can be used for fertilisers

  4. Air is bubbled through the liquid effluent to allow aerobic bacteria to multiply

    In the presence of oxygen, bacteria digest organic molecules and harmful microorganisms

  5. Liquid effluent is then discharged into rivers

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What needs to happen to water from industry before sewage treatment

treated for harmful chemicals

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Aquifers

safe when treated with chlorine

may be polluted by fertilisers so needs to be tested

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Sewage

lots of purification steps=$$$

so only in countries where water is scarce

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Desalination

lots of energy=$$$