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Drinking Water Treatment

Explore common treatment steps, such as coagulation, filtration, and disinfection, to ensure safe drinking water quality. Learn about overcoming challenges like coliform bacteria and turbidity. Discover alternative methods like desalination and solar stills. Science fair project ideas included!

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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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