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