Size (Peak day design capacity, gallons per day) - 1,000,001 - 5,000,000 | 16 |
Pretreatment - Influent pumping | 2 |
Pretreatment - Mechanically cleaned screens | 2 |
Pretreatment - Grit removal | 2 |
Secondary Treatment - Activated sludge: Diffused or dispersed aeration | 10 |
Secondary Treatment - Secondary clarifiers with chemical addition | 7 |
In-plant Odor Control - Odor-reducing sprays | 2 |
Sludge Thickening and Dewatering - Sludge decant tank | 2 |
Sludge Thickening and Dewatering - Evaporative sludge drying by means of drying beds | 2 |
Sludge Thickening and Dewatering - Additional points if a polymer is added to sludge before the sludge is put in drying beds | 3 |
Sludge Stabilization and Conditioning - Aerobic digestion | 5 |
Solids Disposal - Sludge lagoon | 3 |
Solids Disposal - Off-site disposal | 1 |
Disinfection - Ultraviolet light | 3 |