Official Site of the City of Dayton, OH 
Skip navigation links
Home
City Commission Office
City Manager's Office
Departments
News
Services
My Dayton


City of Dayton Advanced
Wastewater Treatment Facility

TREATMENT REQUIRED
PARAMETER
30 - Day Average
30 - Day Average
Actual Performance
Actual Performance
Summer
Winter
Summer
Winter
CBOD5 8 25 BDL BDL
SS - mg/L 12 30 BDL BDL
Coliform/100 ml 1,000 N/A 30 N/A
Chlorine Residual - mg/L <0.038 N/A BDL N/A
Dissolved Oxygen - mg/L >5.0 >5.0 7.7 7.8
Ammonia (NH3-N) - mg/L 1 5 BDL BDL

BDL = Below Detectable Level

PLANT DESIGN DATA

(All loadings calculated at 72 MGD)

DESIGN YEAR 2010
DESIGN POPULATION 340,000
AVERAGE DESIGN FLOW 72 MGD
MAXIMUM DESIGN FLOW 150 MGD

DESIGNED PERFORMANCE

At 72 MGD
BOD
SS
NH3-N
Influent Concentration - mg/L 280 250 25
Primary Removal - % 32 63 N/A
Secondary Removal - % 85 85 N/A
AWT Influent - mg/L 40/45* 40/45* 26/26*
AWT Removal - % 80/45* 50/55* 92/70*
Effluent Filter Influent - mg/L 35
Effluent Filter Removal - % 85
Effluent Concentration - mg/L 12/30* 12/30* 2/8*

* = (summer/winter)

TREATMENT UNITS

PUMP STATIONS
  • BROADWAY

Total Pumping Capacity 210 MGD
Number of Pumps 7
Capacity of Each 30 MGD
  • WESTWOOD

Total Pumping Capacity 35 MGD
Number of Pumps 5
Capacity of Each 7 MGD

GRIT BASINS

  • NORTH - Gets 40% of Total Flow

Number of Basins 2
Dimensions 40 ft X 40 ft
Depth 2 ft
  • SOUTH - Gets 60% of Total Flow

Number of Basins 2
Dimensions 40 ft X 40 ft
Depth 3 ft

PRIMARY SETTLING

  • NORTH - Gets 40% of Total Flow

Number of Basins 4
Diameter 115 ft 
Water Depth 12 ft
Capacity (each) 0.93 MGD
Surface Overflow Rate (all units operating, 72 MGD) 693 gpd/ft2
Detention Time 3.1 hours
  • SOUTH - Gets 60% of Total Flow

Number of Basins 3
Dimensions 240 ft X 80 ft 
Water Depth 13 ft
Capacity (each) 1.87MGD
Surface Overflow Rate (all units operating, 72 MGD) 750 gpd/ft2
Detention Time 3.1 hours

TRICKLING FILTERS

Number of Basins 20
Diameter 24165 ft 
Media Depth 7 ft
Media Type - Random fill slag & limestone 2 in to 4 in diameter
Organic Loading 35 lbs BOD/1000 ft3
Hydraulic Loading 168 gpd/ft2

LOW LIFT PUMP STATION

Total Pumping Capacity 242 MGD
Number of Constant Speed Pumps 2
  • Capacity of Each
 72 MGD
Number of Variable Speed Pumps 2
  • Capacity of Each
 50 MGD

SECONDARY SETTLING

  • EAST -Gets 40% of Total Flow

Number of Basins 4
Diameter 120 ft
Water Depth 10.3 ft
Capacity (each) 0.87 MGD
Surface Overflow Rate (all units operating, 72 MGD) 636 gpd/ft2
Detention Time 2.9 hours
  • WEST Gets 60% of Total Flow

Number of Basins 6
Diameter 120 ft
Water Depth 12.3 ft
Capacity (each) 1.04 MGD
Surface Overflow Rate (all units operating, 72 MGD) 636 gpd/ft2
Detention Time 3.5 hours

INTERMEDIATE PUMP STATION

Number of Variable Frequency Drive Pumps 3
Number of Constant Speed Pumps 2
Capacity of Each 38 MGD

ACTIVATED SLUDGE PROCESS - 3 Pass, plug flow, fine bubble dome diffusers, tapered aeration

Number of Basins 8
Dimensions 153 ft X 135 ft
Water Depth 18 ft
Capacity (each) 2.8 MG
Ammonia applied 15,612 lbs/day
MCRT (avg) 11 days
F/M Ratio 0.1
Detention Time 7.4 hours
Dome Diffusers 6,030 per Basin

AERATION SYSTEM

Number of Activated Sludge Compressors 4
Capacity (each) 22,000 scfm
Motor (4160 V) 1,500 HP
Number of Channel Air Compressors 3
Capacity (each) 3,000 scfm
Motor (460 V) 150 HP

FINAL SETTLING

Number of Basins 8
Diameter 160 ft
Water Depth 16 ft
Capacity (each) 2.4 MGD
Collectors Hydraulic suction, multiple orifice header
Surface Overflow Rate (all units operating, 72 MGD) 448 gpd/ft2
Detention Time 6.4 hours

RETURN & WASTE ACTIVATED SLUDGE PUMPING STATION

  • RAS PUMPS

Number of pumps 10
Capacity of Each 13.6 MGD
Variable Frequency Drives 10
  • WAS PUMPS

Number of pumps 3
Capacity of Each 250 gpm
Variable Frequency Drives 3
  • POLYMER FEED FACILITY

Emulsion Polymer Storage 4 units
Polymer Mix & Aging Tanks 8 units
Chemical Feed Pumps 8 units

EFFLUENT FILTERS

Tertiary Filters - 4 cells/units 5 units
Cell dimensions (each) 30 ft X 30 ft
Type Declining Rate, Automatic Gravity Backwash
Maximum Capacity 115 MGD
Blending Design Rate 35 MGD
Media Type Anthracite Coal
Media Depth 30 inches
Media Size 1.4 to 1.6 mm
Backwash Combined simultaneous water and air scour, 12 gpm/ft2 water, 4 cfm/ft2 air
Filter Run Time (design) 18.8 hrs

CHLORINATION FACILITY

Liquid Feed Auto-Switchover Systems 2 units
Evaporators 2 units
Chlorinators 3 units
Total Feed Capacity (effluent) 6,000 lbs/day
Total Feed Capacity (Non-Potable Water) 200 lbs/day
Chlorination Point After Effluent Filters
Contact Time @ peak flow 15 Minutes

CHLORINATION / DECHLORINATION / POST AERATION BASINS

Number of Basins - (3 passes each) 2
Basin dimensions 153 ft X 78 ft X 10ft
Chlorine Contact First Pass & Half of Second Pass
Dechlorination Last Half of Second Pass
Coarse Bubble Post Aeration Third Pass

DECHLORINATION FACILITY - Liquid Sodium Bisulfate - 38% NaHSO3

Storage Tanks (5,700 gal each) 3 units
Day Tanks (250 gal each) 2 units
Chemical Feed Pumps (50 to 500 gpm) 3 units

POST AERATION FACILITY

Blowers (positive displacement) 3 units
Capacity (each) 2,400 cfm @6 psi

ACTIVATED SLUDGE THICKENING

Dissolved Air Flotation Tanks 4 units
DAF Tank Surface Area 400 ft2
Design Solids Loading (avg) 9350 lbs/day
Feed Solids Concentration (avg) 0.7%
Float Solids Concentration (w/o polymer) 4% peak

FERROUS CHLORIDE FEED FACILITY

Location Inside DAF Building
Purpose Control of H2S in digester gas
Storage Tanks (2,500 gal each) 2 units
Chemical Feed Pumps (0 to 280 gpm) 2 units

ANAEROBIC DIGESTERS - EAST BANK

Number of Units 4
Diameter 90 ft
Depth 33 ft
Cover Type Floating
Operating Temperature 98 F
Approx. Operating Volume (each Digester) 207,816 ft3

ANAEROBIC DIGESTERS - WEST BANK

Number of Units 4
Diameter 85 ft
Depth 30 ft
Cover Type Floating
Operating Temperature 98 F
Approx. Operating Volume (each Digester) 164,560 ft3

DIGESTER GAS STORAGE

Gas Generation per day 810,000 ft3
Gas Holding Sphere 1 unit
Sphere Diameter 52 ft
Sphere Volume 73,620 ft3
Gas Holding Capacity @ 50 psi 300,000 ft3

BIOSOLIDS BENEFICIAL USE

Contractor Bio Grow Systems (Wheelabrator) Inc.
Use Method Agronomic Land Application
Permitted Land in 13 Counties >30,000 acres
Biosolids Storage On-Site, liquid 500,000 gal
Biosolids Storage Area On-Site, cake 15,000 ft2
Belt Filter Presses (2 meter) 4 units
Biosolids Processed Daily (avg) 45 dry tons

ENERGY RECOVERY

Gas Burning Engines 3 units
  • Cylinders (V-block)

12
  • Air Intake
Turbo-charged
Generators (direct coupled to engines) 3 units
  • Volts
 4160
  • Phase
3
  • Cycles
60
Design Loads on WWTP
  • BTUs/hr (heat)
 6,734,000
  • Electric @ 72 MGD
7,336 KW
Design Production at WWTP
  • BTUs/hr (heat)
 8,467,000
  • Electric @ 72 MGD
1,620 KW
Actual Production at WWTP
  • BTUs/hr (heat)
 8,313,917
  • Electric @ 72 MGD
 922 KW

ODOR CONTROL- Covers Headworks, N & S Grit, N & S Primaries, Scum Collection Buildings

Type Packed Tower
Diameter 10 ft
Packing Depth 13 ft
Packing Type Random Fill Polypropylene Media
SCFM 25,000
H2S Inlet 300 PPM
H2S Outlet 1 PPM
Liquid Recirculation Rate 468 gpm
Blowdown Rate (Max) 5 gmp

DETRITUS DEWATERING BUILDING

Building Dimensions 60 ft X 80 ft
Detritus Screw Press 1
  • Screw Press Production Capacity
5 cu. yds. dry material / Hr
Conveyors
  • Main Lift Conveyor
 1
  • Directional Cross Conveyor
 1
  • Distribution Conveyor
 2
Roll Off Containers 2-20 cu. yd

Back to the Wastewater Treatment Home Page
For water service or bill questions call: 937-333-3550
Send questions/comments to: waterweb@cityofdayton.org 		Water Department
320 W Monument Ave Dayton, OH 45402 (937) 333-3725
Director: Tammi Clements
Contact Us | City of Dayton, Ohio | © copyright 2010 | All Rights Reserved