1. Last Question of the Day- For first semester! 1. How do you get the waste out of wastewater o For Friday, please gather all Questions of the day to turn in for extra credit on Marking period 2.

2. Municipal Water Management o In US most municipal water supplies are treated o Collected from water or reservoir o Treated

3. o Treated water distributed to customers o Sewer lines bring sewage to treatment plant o Sewage treated at sewage treatment plant Municipal Water Management

4. Municipal Sewage Treatment o Primary treatment Removing suspended and floating particles by mechanical processes Removing suspended and floating particles by mechanical processes o Secondary treatment Treating wastewater biologically to decompose suspended organic material; reduces BOD Treating wastewater biologically to decompose suspended organic material; reduces BOD

5. Municipal Sewage Treatment o Tertiary treatment Advanced wastewater treatment methods that are sometimes employed after primary and secondary treatments Advanced wastewater treatment methods that are sometimes employed after primary and secondary treatments Reduce phosphorus and nitrogen Reduce phosphorus and nitrogen

6. Sewage Sludge o Solids remaining after primary and secondary sewage treatment has been completed o Disposal Anaerobic digestion Anaerobic digestion Application to soil as fertilizer Application to soil as fertilizer Incineration Incineration Disposal in sanitary landfill Disposal in sanitary landfill (Ocean dumping) (Ocean dumping)

7. Municipal Sewage Treatment

8. Individualized Septic Systems o Sewage piped to septic tank Particles settle to bottom Particles settle to bottom Grease and oils form scummy layer at top that is decomposed by bacteria Grease and oils form scummy layer at top that is decomposed by bacteria Wastewater flows into drain field through network of small, perforated pipes set in trenches of gravel or crushed stone Wastewater flows into drain field through network of small, perforated pipes set in trenches of gravel or crushed stone Bacteria decompose remaining organic material Bacteria decompose remaining organic material Purified wastewater percolates into groundwater or evaporates from the soil Purified wastewater percolates into groundwater or evaporates from the soil

9. Individual Septic System- Septic Tank

10. Individual Septic System- Drain Field