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CE 421/521

CE 421/521. AS Modeling Lecture II Diurnal Flow Active Population Review Virginia Initiative Plant. Diurnal Flow. Wastewater flow and strength reflect activity of population. Expect diurnal flow pattern. Diurnal Flow. Dynamic flow result in lower performance.

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CE 421/521

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  1. CE 421/521 AS Modeling Lecture II Diurnal Flow Active Population Review Virginia Initiative Plant

  2. Diurnal Flow • Wastewater flow and strength reflect activity of population. • Expect diurnal flow pattern.

  3. Diurnal Flow • Dynamic flow result in lower performance. • Performance not solely a function of SRT. • Also depends on biomass change as a result of changing input.

  4. Diurnal Flow • Recall effect of diurnal flow on flow weighted nitrification in CSTR. • Must increase SRT to compensate for dynamic condition.

  5. Active Populations • Heterotrophs • Environment=Aerobic • Electron Donor • Organics • Electron Acceptor • Oxygen • Benefits • Removes organics that suffocate or are toxic to the environment • Drawbacks • Consumes Oxygen (Costs money) • Produces large amounts of sludge

  6. Active Populations • Heterotrophs • Environment=Anoxic • Electron Donor • Organics • Electron Acceptor • Nitrates • Benefits • Removes nitrates • Reduces oxygen use • Generates alkalinity • Drawbacks • Anoxic environment may be difficult to create

  7. Active Populations • Autotrophs • Environment =Aerobic • Electron Donor • Ammonia • Electron Acceptor • Oxygen • Benefits • Removes ammonia • Drawbacks • High oxygen consumption • Reduces alkalinity

  8. Active Populations • Phosphate Accumulating Organisms • Environment=Anaerobic/Aerobic • Benefits • Removes Phosphorus • Drawbacks • Complex life cycle • Requires numerous recycle lines • Phosphorus rich sludge

  9. System to remove: Organics Nitrogen Ammonia Nitrates Phosphorus Environments needed: Aerobic Anoxic Anaerobic System configuration? Virginia Initiative Plant

  10. Virginia Initiative Plant • System configuration: • Anaerobic • Anoxic • Aerobic • Recirculation • RAS to Anoxic • MLR from Aerobic to RAS • MLR from Anoxic to Anaerobic

  11. Virginia Initiative Plant • Benefits? • Drawbacks?

  12. Virginia Initiative Plant • Important consideration: • BOD5/Total P ratio

  13. Virginia Initiative Plant • BOD5/ΔP ratio needed for VIP Process? • 15-20 mg BOD5/mg P • Why? • High efficiency thus no organics lost.

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