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Employment

Wastewater Treatment Plant
History
  • Implements a pre-treatment program which regulates the discharge of wastewater from non-domestic industrial sources city wide
  • Monitors the pre-treatment programs of Peoria and Sun City
  • Has been in operation since 1968
  • The original 4.7 MGD plant has two expansions
  • 1981 to 8.3 MGD capacity
  • 1988 to treat an average dry weather flow of 17.5 MGD
  • Treats wastewater from the cities of Tolleson, Peoria and Sun City
  • Treated effluent is piped to the Palo Verde Nuclear Generating Station
  • In the event that Palo Verde cannot accept the effluent, it is discharged to the Salt River under a AZPDES Permit
  WWTP process
Liquid Stream
  • Mechanical bar screens
  • grit removal
  • primary sedimentation tanks
  • first-stage trickling filters
  • intermediate clarifiers
  • second-stage trickling filters
  • sludge re-aeration basins
  • solids contact channels
  • secondary clarifiers followed by disinfection

Solids Stream 
  • Primary sludge pumps
  • waste secondary sludge pumps
  • gravity belt thickener
  • low pressure steam boilers
  • anaerobic digesters
  • facultative sludge basin
  • belt filter press
  • drying beds and bio-solids windrows

City of Tolleson
Tolleson City Hall • 9555 West Van Buren Street • Tolleson, AZ 85353 • PH: (623) 936-7111 • FAX: (623) 936-7117 • TDD: (623) 936-2792