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Design Data

Treatment Design Data

Influent Flow Metering

Primary ElementParshall Flume
Throat Size 9 in.
Level Measurement Ultrasonic Probe
Minimum Flow Rate 0.25 mgd
Peak Flow Rate 2.73 mgd
Maximum Flow Rate5.0 mgd

Screening

Design Flow2.73 mgd
Ultimate Flow5.0 mgd
Primary Screen
TypeMechanical, traveling fine media
Number 1
Opening Size 15mm
Width 2 ft.
Velocity at design flow 2.5 ft./sec.
Velocity at ultimate flow2.7 ft./see.
Backup Screen
Type Manually cleaned, bar screen
Number 1
Bar spacing 1 in.
Velocity at design flow1.1 ft./sec.

Grit Removal

Grit Chamber

Type Vortex
Number 1
Maximum average flow 4.0 mgd
Size 8 ft. dia.
Design grit range100 mesh
Grit Pump
Type Recessed impeller
Number 1
Capacity50 gpm @ 25 ft TDH
Grit Classifier
Type Cyclonefinclined screw
Number I
Inlet Capacity50 gpm

Activated Sludge Treatment Process

Design Flow1.56 mgd
Design Peak Flow2.73 mgd

Aeration Basins

TypeEarthen 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 time39 hr
MLSS 3,000 Mg/1
Solids Retention time 59 days
Volumetric Loading 10.4 lb. BOD/day/1000 cu ft
Dissolved Oxygen, average0.6 mg/1

Aeration System

Blowers

TypeCentrifugal
Number 4
Capacity1 @ 1000 SCFM, 75 hp
3 @ 1600 SCFM, 100 hp
Discharge Pressure8.5 psi

Diffusers

TypeFine Pore, flexible sheath
Design Oxygen Transfer Efficiency22.5%

Clarifiers

TypeCircular, center feed, perimeter launder
Number 2
Diameter 45 ft
Sidewater Depth 12 ft
Surface Area, each 1590 sq ft
Surface Overflow Rate
-At design flow490 gpd/sq ft
-At peak flow858 gpd/sq ft
Solids Loading Rate
-At design flow12.3 lb/day/sq. ft
-At peak flow21.5 lb/day/sq. ft
Hydraulic Detention Time
-At design flow4.4 hr
-At peak flow2.5 hr
Effluent Weir Loading
-At design flow6,065 gpd/ft
-At peak flow10,597 gpd/ft

Retum Activated Sludge Pumps

Retum Rate0 - 150 percent of design plant flow
Type Horizontal Centrifugal
Number 3: 2 operating, 1 standby
Capacity815 gpm @ 45 ft TDH

Scum Pumps

TypeProgressing Cavity
Number 2
Capacity50 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 Flow10.5 min
-At Peak Flow6 min
Diffusers
TypeFine Pore, flexible sheath
Design Oxygen Transfer Efficiency10%

Disinfection

TypeUltaviolet Radiation
Channel Dimensions 38 ft x 2 ft-3 in
Operating Depth 24 in
U.V. Transmission65%

Effluent Flow Metering

Primary ElementParshall Flume
Throat Size 9 in
Level Measurement Ultrasonic Probe
Minimum Flow Rate 0.25 mgd
Peak Flow Rate 2.73 mgd
Maximum Flow Rate5.0 mgd

Aerobic Digester

Number of Compartments2
Dimensions 35 ft x 35 ft
Operating Depth 12 ft
Volume 220,500 gal
Hydraulic Retention Time 19.8 days
VSS Reduction38%

Sludge Drying Beds

TypeDeskins "Quick Dry" System®
Number 4
Dimensions 40ft x 100ft
Area
-Total16,000 sq. ft.
Applied Sludge Depth6 in
Useable Volume 60,000 gal
Days Storage7