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Public Works - Wastewater Division

Treatment Plant 2 Characteristics

RAW WASTEWATER FLOW

CURRENT AVG DAY FLOW 16.5 MGD
DESIGN AVG DAY FLOW 25.0 MGD
DESIGN PEAK HOURLY FLOW 40.8 MGD
DESIGN PEAK HYDRAULIC FLOW 49.9 MGD
DESIGN BIOCHEMICAL OXYGEN DEMAND (BOD5) 260 mg/L
DESIGN SUSPENDED SOLIDS (TSS) 350 mg/L

HEADWORKS

BAR SCREENS - MECHANICALLY CLEANED 2
BAR RACK SPACING 1/2 INCH

RAW WASTEWATER

NUMBER OF PUMPS 4
TYPE VERTICAL DRY PIT (VFD)
PUMP CAPACITY (EACH) 12,000 GPM
MOTOR HORSEPOWER (EACH) 200 HP

GRIT CHAMBER

GRIT CHAMBERS  
NUMBER OF CHAMBERS 2
GRIT BLOWERS  
NUMBER OF BLOWERS 2
GRIT PUMPS  
NUMBER OF GRIT PUMPS 2
TYPE HORIZONTAL RECESSED
IMPELLER
PUMP CAPACITY (EACH) 250 GPM
MOTOR HORSEPOWER (EACH) 15 HP

PRIMARY CLARIFIERS

PRIMARY CLARFIFIERS  
NUMBER OF CLARIFIERS 3
TANK DIAMETER 110 FT
TANK SIDE WATER DEPTH 13 FT
SURFACE OVERFLOW RATE @ ADF 1,000 GPD/FT2
WEIR LOADING RATE @ ADF 27,500 GPD/FT
PRIMARY SLUDGE PUMPS  
NUMBER OF PUMPS 4
TYPE PROGRESSIVE CAVITY
CAPACITY (EACH) 130 GPM
MOTOR HORSEPOWER (EACH) 15 HP
PRIMARY SCUM PUMPS  
NUMBER OF SCUM WELLS 2
NUMBER OF PUMPS 4
TYPE VERTICAL CHOPPER
CAPACITY (EACH) 150 GPM
MOTOR HORSEPOWER (EACH) 10 HP

TRICKLING FILTERS

TRICKLING FILTERS  
NUMBER OF UNITS 3
TANK DIAMETER 160 FT
FREE BOARD 3.5 FT
MEDIA TYPE 60 DEGREES CROSS FLOW
MEDIA DEPTH 14 FT
RECIRCULATION PUMPS  
NUMBER OF PUMPS 4
TYPE VERTICAL PROPELLER
(2 VFD) (2 CONSTANT)
CAPACITY (EACH) 11,600 GPM
MOTOR HORSEPOWER (EACH) 150 HP
SECONDARY PUMPS  
NUMBER OF PUMPS 4
TYPE VERTICAL MIXED
FLOW (VFD)
CAPACITY (EACH) 11,600 GPM
MOTOR HOUSEPOWER (EACH) 125 HP

SECONDARY CLARIFIERS

SECONDARY CLARIFIERS  
NUMBER OF CLARIFIERS 3
TANK DIAMETER 150 FT
TANK SIDE WATER DEPTH 15 FT
SURFACE OVERFLOW RATE @ ADF 480 GPD/FT2
WIER OVERFLOW RATE @ ADF 17,700 GPD/FT
SECONDARY SCUM PUMPS  
NUMBER OF SCUM WELLS 2
NUMBER OF PUMPS 4
TYPE VERTICAL CHOPPER
CAPACITY (EACH) 175 GPM
MOTOR HORSEPOWER (EACH) 10 HP
SECONDARY SLUDGE PUMPS  
NUMBER OF PUMPS 4
TYPE PROGRESSIVE CAVITY
CAPACITY (EACH) 130 GPM
MOTOR HORSEPOWER (EACH) 15 HP

DIGESTERS

NEW DIGESTERS 2 (2 EXISTING)
NUMBER OF DIGESTERS 3 (IN SERVICE)
TYPE HIGH RATE
ANAEROBIC, PRIMARY
VOLUME (COMBINED) 522,500 Ft3
MIXING PUMPS  
VSS REDUCTION 57%
DIGESTED SLUDGE (2% SOLIDS) 63,000 GPD
GAS PRODUCTION @ 15 CF/LB VSS 218,000 CF/DAY
METHANE PRODUCTION +(62.5%) 166,000 CF/DAY
SOLIDS RETENTION TIME 54 DAYS
CONJUNCTION  
NO. OF UNITS 2
OUTPUT (EACH) 400 KW

 

Service Area: 63.4 Square miles
Staff:  5 Operators, 1 Electrician, 1 Mechanic, 1 Lab Technician,
1 Facility Worker, 1 Supervisor
Plant Capacity: 25 million gallons per day
Average Daily Flow:  14 million gallons per day
Bio-solids Processed: 234 tons per month
Methane Gas Produced:  166,000 cubic feet per day
Average Influent:  BOD 297 mg/L, SS 359 mg/L
Average Efflunent:  BOD 34 mg/L, SS 21 mg/L