city of newark, ohio high rate treatmentfacility started-up in march/april 2011. project background....
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HIGH RATE TREATMENTAS PART OF THE SOLUTION FOR WET WEATHER FLOWS
City of Newark, Ohio
Wet Weather Control Building
High Rate Treatment Tanks/UV
Wet Weather Screen Building
JC2/Wet Weather Pump Station
Final Clarifiers
Chemical Storage and Feed Room
Wet Weather Grit Tanks
Presented By: Joe Jacobs, P.E.
JUNE 22, 2011
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Long Term Control (LTC) Plan Development 2000-2004o Recommended conveyance of wet weather flows to treatment
plant siteo Recommended construction of physical/chemical high rate
treatment facilities NPDES Permit Compliance Schedule:
o Submit permit-to-install application: August 2008o Complete construction: December 2010
Planning/Basis of Design Report in 2007 Detail Design/Bid in 2008 Construction began in March of 2009 Facility Started-up in March/April 2011
PROJECT BACKGROUND
54” LICKING RIVER INTERCEPTOR
42” MAIN STEM INTERCEPTOR
JUNCTION CHAMBER 2
JUNCTION CHAMBER 1
CSO-1006 ELIMINATED AND NEW 48” INTERCEPTOR REPLACED EXISITNG 30-INCH SEWER
42” TO WWTP
CSO-1008
48” NORTH FORK INTERCEPTOR SEWER
WET WEATHER PUMP STATION
36” TO WET WEATHER SYSTEM
EXISTING RACOON CREEK INTERCEPTOR SEWER
CSO-1012
CSO-1013
SOUTH FORK LIFT STATION
CSO-1015
CSO-1014A
CSO-1014BRAC
CO
ON
CR
EEK N
NEW RACCOON CREEK INTERCEPTOR SEWER
COLLECTION SYSTEM
EXISTING SEPARATE SEWER
EXISTING COMBINED SEWER
NEW/PROPOSED SEPARATE SEWER
NEW COMBINED SEWER
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Limit 6 Upstream CSOs to 4 to 6 events per year No effluent permit limits in proposed draft permit. Permit
provides for effluent monitoring only. Basis of Design Assumed:
• Minimum of 80 Percent of TSS• No limit for CBOD• No limit for NH3-N• Disinfection required during summer months
o E. Coli: 284/100 ml on weekly basiso E. Coli: 126/100 ml on a monthly basis
• No limit for dissolved oxygen
HIGH RATE TREATMENT GOALS
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SWMM MODEL DEVELOPMENT
The SWMM model was developed as part of Long Term Control Plan
Model included all planned improvements to the collection systemo 54-inch Licking River Interceptor (Completed)o CSO-1007 Separation (Completed)o CSO-1006 Elimination (Recently completed)o CSO-1013 Underflow (Recently completed)o 48-inch Raccoon Creek Interceptor (Under Design)o CSO-1030 Separation (Under Design)
Model run with actual 2005 annual rainfall data
INFLUENT HYDROGRAPH
EXTENDED STORM EVENT WITH MULTIPLE RAINFALL EVENTS RESULTS IN MULTIPLE PEAKS AT WWTP
SWMM Model Results
WWTP Secondary Treatment Capacity
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SWMM MODEL CONCLUSIONS
The existing 42-inch and 54-inch interceptors convey approximately 51-mgd before overflowing at CSO-1008
51 separate overflow events per year were identified where High Rate Treatment or Equalization would be required
6 events were identified where CSO-1008 would have activated with High Rate Treatment
Use of existing Equalization could reduce the number of times High Rate Treatment is used by half
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BASIS OF DESIGN
WWTP Influent Pumping & Grit Removal
WWTP Screening
Administration Building
Aeration
Equalization
Final
Clarifiers
PrimaryClarifiers
Wet Weather Control Building
Wet Weather Screen Building
JC2/Wet Weather Pump Station
High Rate Treatment Tanks
WWTP Flow Rates:• 8-mgd Average Dry Day• 20-mgd Peak Secondary
High Rate Treatment System:• 28-mgd sustained• 32-mgd intermittent peak
Total Wet Weather Capacity• 48-mgd sustained• 52-mgd intermittent peak
Construction Cost: $15.3 Million ARRA Funding: $5.0 Million
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PROCESS OVERVIEW
Junction Chamber No. 2 Wet Weather Pump Station Wet Weather Screening Wet Weather Grit Removal Equalization High Rate Treatment
o Microsand Recirculation Circuito Bulk Sand Feed Systemo Coagulant Feed Systemo Polymer Feed Systemo Defoamer Feed System
Wet Weather Disinfection
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JUNCTION CHAMBER 2
Purpose: Provides flow splitting between
Wastewater Treatment Plant and Wet Weather Treatment Facility
Provides preferential diversion of separate sanitary sewer flows to Wastewater Treatment Plant
Provides preferential diversion of combined sewer flows to Wet Weather Treatment System
Wet Weather Pumps
JC2 Control Gate
Wet Weather Pump Station
Junction Chamber 2
54” Licking River Interceptor (Combined)
42” Main Stem (Separate)
42” WWTP Influent
24” Secondary Effluent
N
36” HRT Force Main
Junction Chamber 2
Wet Weather Pump Station
Flow Meter Chamber
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WET WEATHER PUMPING
Purpose: Convey flow to wet weather process and control
hydraulic grade in upstream sewers
Basis of Design: Firm Pumping Capacity: 34 mgd Number of Pumps Five (4 duty, 1 standby) Type Submersible Centrifugal Pump Capacity 6,000 gpm @ 30 ft Drive Type: Variable Speed
Submersible Wet Weather Pumps
Wet Weather Pump Station and Junction Chamber 2 Section View
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WET WEATHER SCREENING
Purpose: Floatables control, mitigate plugging of downstream equipment (hydrocyclones)
Basis of Design: Number of Screens: Two Type: Automatic Self Cleaning Filter Element Size: 6 mm Compactor: Screw conveyor w/press
Conveyor Discharge Chute Continuous Conveyor Screen
Two Parkson Aqua Guard Type Screens
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WET WEATHER GRIT REMOVAL
Purpose: Remove 95 percent of grit 100 microns and larger, essential for Actiflo process No grit dewatering or classifying equipment provided to simplify operation; grit
returned to wastewater treatment plant influent
Basis of Design No. of grit tanks: Two Type: Vortex tray settler No. of trays per tank: Eight 12 ft diameter
Grit Underflow Valve
Screen Channel and Grit Tank Section View
Multiple Tray Vortex Settler
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EQUALIZATION
Purpose: Store volume from low intensity short
duration storm events
Basis of Design: Convert existing equalization to wet
weather operation Volume: 1,000,000 gallons
Existing Equalization Basins at Newark
New Equalization Junction Chamber
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HIGH RATE TREATMENT
Purpose: Treat and discharge wet
weather flows from highintensity long durationstorm events
Provide enhancedprimary treatment of wetweather flows
Basis of Design No. of Trains Two Type Ballasted flocculation process Manufacturer Actiflo process by Kruger Capacity 14 mgd per train sustained
16 mgd per train intermittent peak Overflow rate 60 gpm/sf sustained
66 gpm/sf intermittent peak
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MICROSAND
Purpose: Microsand serves as the seed for floc formation and ballast (weight) to
aid with settling
Basis of Design: Sand Concentration 3,000 to 6,000 mg/l
Initial Sand Feed 800 lbs/MGD Capacity
@ 14 MGD = 11,200 lbs per HRT tank
Sand Loss 2 to 3 mg/l per MG treated
16 to 25 lbs per MG treated
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MICROSAND CIRCUIT
Purpose: Separate settled solids from microsand and return
microsand to the injection tank. Settled solids are conveyed to the wastewater treatment plant
Basis of Design Microsand Pumps
o Purpose: Recirculation of microsand and settled solids
o No. of pumps: 3 per train (2 duty, 1 standby)o Capacity: 310 gpm each at 76 ft TDH
Hydrocycloneso Purpose: Separate microsand from settled solidso Hydrocyclones: 3 per train (2 duty, 1 standby)o Capacity: 310 gpm at 22 psig Underflow: 60 gpm to injection tank Overflow: 250 gm to WWTP @ 0.1 to 0.5 percent solids
Microsand Pumps
Train 1 Hydrocyclones and Sample Sink
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BULK SAND FEED SYSTEM
Major Components Bulk Bag Unloader Unloading Bin Volumetric Feeder: (2,000 lb/hr) Wetting Cone Eductor Nozzle Booster Pump
Booster Pump
Eductor Nozzle Wetting
Cone
1 Ton Mini Sack
Monorail & Hoist
Volumetric Feeder
Unloading Bin
Bulk Sand Feed System
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COAGULANT FEED SYSTEM
Purpose: Destabilize suspended solids and colloidal matter in raw water
Basis of Design: Coagulant: Aluminum Chlorohydrate (ACH) Feed Pumps: 4 each (2 duty, 2 standby) Type: Peristaltic (Hose) Pumps Dosage 10 to 50 mg/l (Based on ACH) Feed Range 2.4 to 130 gph
6,000 Gallon Coagulant Storage Tank
Coagulant Feed PumpsCoagulant Induction Units
High Rate Treatment – Coagulant Process Flow Schematic
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POLYMER FEED SYSTEM
Purpose: Flocculent aid for coagulated water
Basis of Design Polymer Type: Anionic Emulsion Blending Units: 4 each (2 duty, 2 standby) Polymer Dosage: 1 to 3 mg/l Feed Range: 0.5 to 10 gph
Feed Points Between the coagulation tank and the injection
tank Between the injection tank and the maturation
tank Mid-point of the maturation tank
Polymer Blending Unit
High Rate Treatment – Polymer Process Flow Schematic
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DEFOAMER FEED SYSTEM
Purpose: Mitigate foaming in HRT Effluent
Basis of Design: Defoamer Agent: TRAMFLOC Feed Pumps: 2 each (1 duty, 1 standby) Dosage: 1 to 5 mg/l Feed Range 1.2 to 6 gph
Feed Points HRT Effluent Channel Downstream of UV System
HRT Effluent Channel Foam at Start-up
Defoamer Feed System
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WET WEATHER DISINFECTION
Purpose: Provide disinfection of wet weather flows prior to discharge
Basis of Design: Type: Medium Pressure Manufacturer: Trojan Technologies Sustained Capacity: 28 mgd Intermittent Peak: 32 mgd Total No. of lamps: 128 each UV Transmittance: 50 percent
Influent and Effluent Automatic Samplers
Trojan UV4000 Plus UV Disinfection System
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QUESTIONS?
Joe Jacobs, P.E.Malcolm Pirnie, Inc.1900 Polaris Parkway, Suite 200Columbus, Ohio 43240
Wet Weather Treatment Facility West Elevation
Wet Weather Treatment Facility East Elevation