Richard P. Arber Associates designed the 3.6 mgd expansion to the Lone Tree Creek Wastewater Treatment Plant. The plant includes provisions for reuse of the treated wastewater for landscape irrigation. Located in the Cherry Creek Basin, just upstream of Cherry Creek Reservoir, the facility faces a stringent discharge limit for phosphorus that requires tertiary treatment. Key components of the project include:

• Extensive treatment technology evaluation of membrane bioreactors, biological nutrient removal (BNR’s), membrane filtration and sand filtration.
• Design of a BNR and sand filtration system for biological removal of nitrogen and phosphorous.
• Rotating influent screens.
  
• Mixed liquor return flexibility.
• Absorption Clarifiers.
• Sulfuric Acid for pH Control.
• Sodium Aluminates for Phosphorus Removal.
• Rotating Drum Thickeners.
• Aerobic Digestion.
  
• Centrifuges for Sludge.
  
• Polymer Feed System.
• Rotating Drum Thickeners.
  
• Aerobic Digestion.
  
• Centrifuges for Sludge Dewatering.
  
• Polymer Feed System.
• Chlorine Disinfection.
• Dechlorination Facilities.