1. Water Pollution Abatement II Effluent Treatment
Chapter 26
PPT 110

2. Primary Treatment Means to remove suspended solids Sedimentation
Also reduces BOD & toxicity
Sedimentation
Quiescent flow and time
Flotation Clarifiers
Dissolved air and float

3. Sedimentation Different zones Clarification and Thickening
Lab settling trials
Particle density/shape/size
Use of chemicals

4. Flotation Clarifiers Tiny Bubbles Flocculant Particle density
Scoop or skim
High Efficiency – high operating cost
Whitewater Saveall applications

5. Secondary/Biological Treatment
Duplicate Nature’s purification process
Sufficient Aeration and mixing
Micro’s eat O2 and make CO2 & water
Adding nutrients to stimulate metabolic action

6. Water Treatment- Primary and Secondary

7. Aeration Lagoon

8. Secondary Treatment? Oxidation/Aeration lagoon Activated Sludge System
Area and methodology
Capital and operating cost 50% less than
Activated Sludge System
Even less space
High nutrient requirement even when down
Sensitive to changes in character and pH
Biological Filter

9. Color Removal Brown Color Bleach Process Modifications
Tannin and Lignin derivatives
Bleach Process Modifications
Lime/alum coagulation
Precipitate color bodies out at high pH
Incinerate in the lime kiln
Rapid infiltration
Through soil
Adsorption and precipitation

10. Solid Handling Concentrate the Sludge Landfill Incinerate
Pressure filters
Belt Presses
Reduce volume and transport cost
Easier to handle
Reduce environmental impact
Improve heat value
Landfill
Incinerate
Governmental Control – ground/surface water