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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 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 • Storage • Extraction
Grass Filtration • Soil type • Grass type • Bacteria • Result
Grass Filtration Transpiration Rye Grass In Out Clay soil Concrete drain Earth drain
Land filtration • Soil type • Friable • Grass type • Bacteria • Water evaporation / Transpiration • trees • Grazing • Recycling • Result • Best method
Land filtration Aerobic bacteria Anaerobic Bacteria
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.
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
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.