1. 1 Wastewater Treatment Processes Jae K. Park, Professor University of Wisconsin-Madison

2. 2 Preliminary treatment Typically biological treatment Thickening

3. 3 Wastewater Treatment Plant Flowchart Industrial Domestic Wastewater or raw sewage Preliminary treatment Screening Grit removal Primary treatment Secondary treatment Disinfection Receiving waterbody Optional Tertiary treatment Gravity thickener DAF Anaerobic digester Thickening or dewatering Disposal Pump Landfill

4. 4 Communitors/Grinders

5. 5 Screening - Coarse

6. 6 Screening - Fine

7. 7 Grit Removal

8. 8

9. 9

10. 10 Primary Sedimentation Odor Control Pipe Covered Overflow Weir Scum Removal Weir Scrubber for Odor Control Scum Collection Arm 10

11. 11 Rectangular Primary Sedimentation Tanks 11

12. 12 Biological Treatment 12

13. 13 Secondary Clarification

14. 14 Chlorine Disinfection Chlorine contact basin Dechlorination is needed to eliminate the toxicity of the chlorine.

15. 15 Disinfection - UV 15

16. 16 Sludge Thickening - Primary

17. 17 Sludge Thickening - Secondary Dissolved Air Flotation

18. 18 Sludge Stabilization

19. 19 Dewatering

20. 20 Sludge Disposal – Land Application

21. 21 Sludge Disposal – Landfill

22. 22 Sludge Disposal – Incineration