Design Data
Columbia Boulevard Wastewater Treatment Plant
Design Data
| Service population: | 614,000 | |
| Number of employees: | 90 | |
| Design flow: | Primary | Secondary |
| Average | ||
| dry weather capacity: | 120 mgd | 100 mgd |
| Peak | ||
| wet weather capacity: | 300 mgd | 160 mgd |
| Average daily flow: | 73 mgd | |
| Peak flow: | 280 mgd (max-wet season) | |
| Annual operating cost: | $13,900,000 | |
| Unit | Number | Type/Size |
| Pumps and Headworks | ||
| Influent pump | 6 | Centrifugal |
| Bar screen | 5 | 5/8-inch clearance |
| Grit basin | 6 |
24-foot diameter, mechanically induced vortex |
| Primary Section | ||
| Settling tanks | ||
| Dry weather | 4 | 1,400,000 gal. (each) |
| Wet weather | 8 | 1,015,186 gal. (each) |
| Secondary Section | ||
| Aerator | 8 | 1,825,500 gal. (each) |
| Final clarifier | 8 | 1,460,938 gal. (each) |
| Effluent Pumps | ||
| Wet weather | 3 | 62,500 gpm (each) |
| Dry weather | 2 | 62,500 gpm (each) |
| Outfall line: | ||
| Gravity | 87-inch, 2.3 miles | |
| Pressurized | 72-inch, 1.52 miles | |
| Digestion | ||
| D-1, D-2 secondary digestion | 2 | 1,323,960 gal. (each) |
| D-3 blend tank | 1 | 1,323,960 gal. |
| D-4 gas storage | 1 | 1,323,960 gal. |
| D-5,6,7,8, 9 & 10 primary digestion | 6 | 2,393,960 gal. (each) |
| Biosolids | ||
| Belt press | 4 | 60 dry tons produced per day |
| Sludge output concentration | 20% solids | |