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Anoxic Selector Single Stage Nitrification Process Waste Water Plant Theory and Practise
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Anoxic Selector Single Stage Nitrification Process Waste Water Plant Theory and Practise

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Texas Commission on Environmental Quality (TCEQ) Annual Water Quality Training Conference. Practical application of Nitrification and Denitrification at a new or existing wastewater treatment plant …

Texas Commission on Environmental Quality (TCEQ) Annual Water Quality Training Conference. Practical application of Nitrification and Denitrification at a new or existing wastewater treatment plant (WWTP). Principles and Theory.

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  • 1. Anoxic selector, single stage nitrification process TCEQ Annual Water Quality Training Conference October 18, 2006 Daniel Christodoss PhD, PE and Mike Jupe City of Waco Water Utility Services
  • 2. Presentation  Review of Theory  Nitrification  Denitrification Characteristics of bioreactors  Aerated or Oxic  Un-aerated or Anoxic Nitrification Optimization Denitrification Optimization  PRACTICAL APPLICATIONS @ WMARSS   
  • 3. Nitrification  Oxidation of ammonia to nitrite in oxic conditions by nitrosamonas group (Optimum pH 8.0):  2NH3+ + 3O2 2H+ + 2H2O + 2NO2-  Oxidation of nitrite by nitrobactor group:  2NO2- + O2 2NO3- (nitrates)  Oxygen mechanically provided by blowers  Oxygen Consumption: 4.6 lbs of oxygen per lb of ammonia oxidized to nitrates (energy intensive!)  Recover Nitrification Cost: De-nitrification  Nitrobes that Nitrify are facultative (oxic or anoxic). In anoxic they can use NO3 in lieu of direct O2 for cellular respiration and denitrify
  • 4. Aerated (Oxic) Bioreactor O2 + Pollutants + Microorganisms Primary Effluent RAS (microorganisms) WAS
  • 5. Denitrification Using biomass in wastewater as carbon source for bacteria: C5H7NO2 + 4.6 NO32.8 N2 + 5 CO2 (biomass) (nitrates) + 1.2 H2O + 4.6 OH Because within the anoxic reactor no dissolved oxygen is supplied bacteria strip the oxygen molecule from the nitrates and consume the BOD present. ADVANTAGES OF DENITRIFICATION    N2 Nitrate is reduced to nitrogen: NO3 BOD is consumed Alkalinity is replenished saving the buffer for subsequent pH sensitive biological reactions
  • 6. Un-aerated Bioreactor (Anoxic Zone) Nitrate Recycle Primary Effluent Anoxic Aerobic RAS WAS
  • 7. Nitrification Optimization Summary  Test nitrification rate occasionally  Select appropriate SRT  Keep DO at min 2 mg/l @ peak conditions  Keep pH about neutral (optimal 7.5 to 8.5)  Provide sufficient alkalinity  Replenish a portion of the alkalinity consumed during the nitrification process by denitrification
  • 8. Denitrification Optimization Summary  Minimize DO in anoxic zone (< 0.2 mg/l)  Maximize recycle capabilities  Provide sufficient carbon source
  • 9. Ludzak - Ettinger Process
  • 10. Brazos River Effluent Influent 4 Digestors Chlorination & Dechlor DAF TF cogen WMARSS Aerial Admin ary rim 4p 5 aeration tanks Sludge Lagoons 4 final clarifiers Filters ks tan Pelletization Facility