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Melbourne Sewage System

Melbourne Sewage System. Western Treatment plant Eastern treatment Plant Regional treatment plans. Western Treatment plant. Primary Treatment Sludge Grass Filtration Land Filtration Lagooning Aerobic Facultative. Primary Treatment. Screening Sedimentation Sludge. Evaporation.

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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

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