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Melbourne Sewage System
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Melbourne Sewage System

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  1. Melbourne Sewage System Western Treatment plant Eastern treatment Plant Regional treatment plans

  2. Western Treatment plant • Primary Treatment • Sludge • Grass Filtration • Land Filtration • Lagooning • Aerobic • Facultative

  3. Primary Treatment • Screening • Sedimentation • Sludge • Evaporation • Storage • Extraction

  4. Grass Filtration • Soil type • Grass type • Bacteria • Result

  5. Grass Filtration Transpiration Rye Grass In Out Clay soil Concrete drain Earth drain

  6. Land filtration • Soil type • Friable • Grass type • Bacteria • Water evaporation / Transpiration • trees • Grazing • Recycling • Result • Best method

  7. Land filtration Aerobic bacteria Anaerobic Bacteria

  8. Lagooning

  9. Digestion in Aquatic Environments • In stationary water two layers develop: • Upper Layer with the oxygen • oxygen being used up by aerobic and facultative bacteria. • CHO N S ---> CO2 + NO3 + SO4= • The bottom layer • No oxygen so anaerobic bacteria grow. • Digest organic mater ---> H2S, NH3 and CH4. • The bad smelling gases • Don’t escape to the environment • oxidised to H20, NO2-, SO4 and CO2 in the aerobic layer.

  10. Digestion In a Pond

  11. Dissolved Gases In Pond

  12. Lagoon System

  13. Lagoon System • Grass filtration can be saturated if too much water. • Lagoons can vary the though put by over 10 times • The more material put through the lagoons the faster the bacteria grow

  14. Throughput in a Lagoon

  15. Serpentine Lagoons

  16. Lagoon at Werribee

  17. Capture of Methane

  18. Marine Disposal

  19. Marine Digestion • A marine environment similar to lagoons. • If the affluent is discharges far enough out • BOD removed before any reaches the coast • Affluent must be primary treated. • The massive amount of non-salty water will alter the ecosystem • causing a different organisms to develop.

  20. The End