Sewage Treatment Introduction Needed to control disease

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Presentation transcript:

Sewage Treatment Introduction Needed to control disease Various degrees of treatment SCC Science Dept

No Treatment Straight into rivers Your problem is washed downstream. You get it from upstream SCC Science Dept

Primary Treatment (i) Screening – removing lumpy bits (ii) Sedimentation – allow solids to settle Discharge of liquid – Composting of solids left behind kills pathogenic bacteria Better than nothing but not great SCC Science Dept

Secondary Treatment Follows primary Much better (i) Biological Oxidation [E.g. Activated Sludge Process] stir the sludge vigorously [or pour over large surface area to oxygenate] encourages growth of aerobic micro-organisms these digest the sewage and destroy pathogens SCC Science Dept

liquid is then discharged into rivers etc. (ii) Sedimentation liquid is then discharged into rivers etc. Biologically safe i.e. you wont get disease from it problem Eutrophication Excess plant growth caused by excess nutrients. When these run out the plants die, rot and use up the oxygen which kills almost all the animals and Destroys the habitat. SCC Science Dept

Tertiary Treatment Follows Secondary Treatment Not common because it is expensive Removes ions by precipitation PO43- [phosphate] and NO31- [nitrate] These ions cause eutrophication – ecess plant growth caused by excess nutrients Water completely now safe. SCC Science Dept

Test SCC Science Dept

List the different ways in which sewage is treated and briefly explain what happens in each.[15] Primary / screening / sedimentation / discharge liquid / composting of solids // secondary / biological oxidation / active sludge / aerobic micro-organisms / digest sewage / kill pathogenic / sedimentation / discharge liquid / biologically safe // tertiary / removal of PO4 / and NO3 ions / by precipitation / discharge / totally safe 2. What is eutrophication and what problems does it cause? [8] Excess plant growth / caused by excess nutrients / when these run out / plants die / rot / use up oxygen / produce toxins / kill most life in pond / SCC Science Dept