Design Capacity: 7.5 million gallons per day (MGD)
Mode of Treatment: Biological and Chemical Treatment Systems
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