Design Data
Treatment Design Data
Influent Flow Metering
| Primary Element | Parshall Flume |
|---|---|
| Throat Size | 9 in. |
| Level Measurement | Ultrasonic Probe |
| Minimum Flow Rate | 0.25 mgd |
| Peak Flow Rate | 2.73 mgd |
| Maximum Flow Rate | 5.0 mgd |
Screening
| Design Flow | 2.73 mgd |
|---|---|
| Ultimate Flow | 5.0 mgd |
| Primary Screen | |
| Type | Mechanical, traveling fine media |
| Number | 1 |
| Opening Size | 15mm |
| Width | 2 ft. |
| Velocity at design flow | 2.5 ft./sec. |
| Velocity at ultimate flow | 2.7 ft./see. |
| Backup Screen | |
| Type | Manually cleaned, bar screen |
| Number | 1 |
| Bar spacing | 1 in. |
| Velocity at design flow | 1.1 ft./sec. |
Grit Removal
Grit Chamber
| Type | Vortex |
|---|---|
| Number | 1 |
| Maximum average flow | 4.0 mgd |
| Size | 8 ft. dia. |
| Design grit range | 100 mesh |
| Grit Pump | |
| Type | Recessed impeller |
| Number | 1 |
| Capacity | 50 gpm @ 25 ft TDH |
| Grit Classifier | |
| Type | Cyclonefinclined screw |
| Number | I |
| Inlet Capacity | 50 gpm |
Activated Sludge Treatment Process
| Design Flow | 1.56 mgd |
|---|---|
| Design Peak Flow | 2.73 mgd |
Aeration Basins
| Type | Earthen with synthetic liner |
|---|---|
| Number | 2 |
| Volume | 1.27 MG/basin |
| Bottom Dimensions | 50 ft x 100 ft |
| Side Slopes | 2 horiz : I vert |
| Operating Depth | 15ft |
| Hydraulic detention time | 39 hr |
| MLSS | 3,000 Mg/1 |
| Solids Retention time | 59 days |
| Volumetric Loading | 10.4 lb. BOD/day/1000 cu ft |
| Dissolved Oxygen, average | 0.6 mg/1 |
Aeration System
Blowers
| Type | Centrifugal |
|---|---|
| Number | 4 |
| Capacity | 1 @ 1000 SCFM, 75 hp |
| 3 @ 1600 SCFM, 100 hp | |
| Discharge Pressure | 8.5 psi |
Diffusers
| Type | Fine Pore, flexible sheath |
|---|---|
| Design Oxygen Transfer Efficiency | 22.5% |
Clarifiers
| Type | Circular, center feed, perimeter launder |
|---|---|
| Number | 2 |
| Diameter | 45 ft |
| Sidewater Depth | 12 ft |
| Surface Area, each | 1590 sq ft |
| Surface Overflow Rate | |
| -At design flow | 490 gpd/sq ft |
| -At peak flow | 858 gpd/sq ft |
| Solids Loading Rate | |
| -At design flow | 12.3 lb/day/sq. ft |
| -At peak flow | 21.5 lb/day/sq. ft |
| Hydraulic Detention Time | |
| -At design flow | 4.4 hr |
| -At peak flow | 2.5 hr |
| Effluent Weir Loading | |
| -At design flow | 6,065 gpd/ft |
| -At peak flow | 10,597 gpd/ft |
Retum Activated Sludge Pumps
| Retum Rate | 0 - 150 percent of design plant flow |
|---|---|
| Type | Horizontal Centrifugal |
| Number | 3: 2 operating, 1 standby |
| Capacity | 815 gpm @ 45 ft TDH |
Scum Pumps
| Type | Progressing Cavity |
|---|---|
| Number | 2 |
| Capacity | 50 gpm @ 25 Ft TDH |
Post Aeration
| Basin | |
|---|---|
| Dimensions | 32 ft x 8 ft |
| Operating Depth | 6ft |
| Volume | 11,500 gal |
| Hydraulic Detention Time | |
| -At Design Flow | 10.5 min |
| -At Peak Flow | 6 min |
| Diffusers | |
| Type | Fine Pore, flexible sheath |
| Design Oxygen Transfer Efficiency | 10% |
Disinfection
| Type | Ultaviolet Radiation |
|---|---|
| Channel Dimensions | 38 ft x 2 ft-3 in |
| Operating Depth | 24 in |
| U.V. Transmission | 65% |
Effluent Flow Metering
| Primary Element | Parshall Flume |
|---|---|
| Throat Size | 9 in |
| Level Measurement | Ultrasonic Probe |
| Minimum Flow Rate | 0.25 mgd |
| Peak Flow Rate | 2.73 mgd |
| Maximum Flow Rate | 5.0 mgd |
Aerobic Digester
| Number of Compartments | 2 |
|---|---|
| Dimensions | 35 ft x 35 ft |
| Operating Depth | 12 ft |
| Volume | 220,500 gal |
| Hydraulic Retention Time | 19.8 days |
| VSS Reduction | 38% |
Sludge Drying Beds
| Type | Deskins "Quick Dry" System® |
|---|---|
| Number | 4 |
| Dimensions | 40ft x 100ft |
| Area | |
| -Total | 16,000 sq. ft. |
| Applied Sludge Depth | 6 in |
| Useable Volume | 60,000 gal |
| Days Storage | 7 |