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Drinking Water Treatment

Drinking Water Treatment. Drinking Water Quality. USEPA Drinking Water Regulations Coliform bacteria Turbidity Organic and inorganic chemicals Radionuclides. Greater Cincinnati Water Works. Major Treatment Processes: Settling (coagulation, flocculation) Filtration Disinfection.

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Drinking Water Treatment

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  1. Drinking Water Treatment

  2. Drinking Water Quality • USEPA Drinking Water Regulations • Coliform bacteria • Turbidity • Organic and inorganic chemicals • Radionuclides

  3. Greater Cincinnati Water Works • Major Treatment Processes: • Settling (coagulation, flocculation) • Filtration • Disinfection

  4. Common Treatment Steps • Coagulation • Filtration • disinfection

  5. Coagulation • overcome negative charged clays by adding alum (Al3+) or ferric (Fe 3+) ions

  6. Filtration • Rapid sand • Slow sand (surface cake also bioactive) • Dual media • flotation

  7. Disinfection • Chlorine, chloramine, chlorine dioxide • Ozone, UV

  8. Other methods • Activated carbon • Ion exchange/chemical precipitation • Membranes • Air stripping (then comes distribution)

  9. Pur Demonstration

  10. Alternatives • Desalination • solar still • Filters • Slow sand filter • Dual bucket sand filter • Diatomaceous earth • Bag and cartridge filters • Conservation • Recycling

  11. Science Fair Project Design a water treatment device Factors to consider: • Technology (feasibility, reliability, quantity, quality) • minimum parameters turbidity and total coliform • Environmental impacts (air emissions, waste management, energy use) • Cost

  12. Their water purification system incorporated two buckets, filtration material, and a siphoning tube. Plastic housing provided the support for her fabric-based filtration device. Secured funnels in series so that the dirty water would pass through a variety of filter material before being tested for its effluent quality. The water cascaded downward through graded filter bed material, modeling a fixed bed water treatment scheme.

  13. Resources • Solar Still • Laboratory Manual • Survival Still • Laboratory Manual • EPA : http://www.epa.gov/safewater/kids/wsb/index.html • Water Works Lesson • Carbon treatment lesson • Chlorination lesson • Oasis water treatment website • American Water Works Association website • Water Environment Federation website • handouts

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