Plant Operations

Plant Specifications
  • Built in 1975
  • Major aeration upgrade in 1997
  • Design Capacity: 7.5 million gallons per day (MGD)
  • Mode of Treatment: Biological and Chemical Treatment Systems
Waste Water Treatment Plant Aerial View
Biological Treatment System
  • 31 acres of aerated lagoons
  • 90,000,000 gallon storage capacity
  • 40 to 45 day detention time
  • 2 300-horse power blowers produce 7,000 standard cubic feet per minute each
  • 4 50-horse power blowers produce 1,100 standard cubic feet per minute each
Lagoon No. I
  • 1,600 feet north to south, 500 feet east to west, 10 foot-depth
  • 392 sub-surface air diffusers
Lagoon No. II
  • 1,280 feet north to south; 250 feet east to west; 10 foot depth
  • 104 sub-surface air diffusers
Biological Treatment
Reduces concentrations of:
  • Ammonia Nitrogen (NH3-N)
  • Biological Oxygen Demand (BOD)
  • Suspended Solids (SS)
Secondary Treatment System
  • Chemical treatment
  • Ferric Chloride used to remove phosphorus, chlorine used for coliform control
  • Two 375,000 gallon capacity up flow clarifiers for phosphorus, suspended solids removal
System Components
  • 65 miles of sanitary sewer lines
  • 11 pumping stations.
  • 11 additional pumping stations owned/operated by Pere Marquette Township, Mason County DPW, City of Scottville and Tamarac Village Mobil Home Park also pump sewage to the Ludington WWTP