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