Design Data

Treatment Design Data

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 in. 
1.1 ft./sec.

Grit Removal

Grit Chamber

Type 
Number 
Maximum average flow 
Size 
Design grit range

Vortex 

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 

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 

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 

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 

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 

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


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®

40ft x 100ft 

16,000 sq. ft. 
6 in 
60,000 gal 
7

 

 

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