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Minneapolis Fridley Filter Plant Split
Surface Water Treatment Workshop
April 29 May 1, 2014Fargo, ND
Todays Presentation Fridley Filter Plant (FFP) History &
Overview
Why FFP split project? y p p j
Project overview
Planning efforts before construction
Construction phase
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History 1910 to 1913 Filtration plant construction at
Columbia Heights site 1925 Filtration plant at Fridley site 1940
Lime softening plant at Fridley site 2005 C.H. membrane plant
(CHMP) in service 2013 Upgrades to FFP begin
Phase 1: FFP Split Project Phase 2: Fridley Filter
Rehabilitation
Process Schematic
PUMP
MississippiRIVER
RECARB.MIX
FILTERSCOAG / SETTLEMIX RESERVOIRS(and Distributionto
Customers)
Fridley campus . . . .
SOFTENING
RESERVOIRFILTERSCOAG / SETTLEMIX
RESERVOIRS(and Distribution
to Customers)Columbia Heights campus . . . . . .
to Customers)
PUMP
ULTRAFILTRATION
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System Capacity
Population served = 500,000
Fridley Softening Plant (Total Capacity) = 160 MGD CHMP Capacity
= 75 MGD (summer)
= 40 MGD (winter) FFP Capacity = 120 MGD
Average Daily Demand = 60 MGD
Project Drivers
To improve operational redundancy Rehabilitate filters (with GAC
in 2 phases)
keeping half of the plant in servicekeeping half of the plant in
service To enable taking portions of the plant
out of service for other repairs and maintenance
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Project Overview Lower Level
REMOVE EXISTING GATE
CONTROL CHAMBERVENTURI CHAMBER
FILTERED WATERCONDUIT
66 AND 84 PIPES FROM PS NO 6
VALVE 182
VALVE 183
N
FILT
ERS
ILTE
RS
FILT
ERS
ILTE
RS
COAG 2 COAG 3
COAG 1 COAG 4
WESTCLEARWELL
EASTCLEARWELL
BY-PASSVALVE
MIXING CHAMBERS
LEGEND
NEW GATE (5X5)NEW WALLNEW SEGMENTAL WALL
F F
FILTERED WATERCONDUIT
Project Overview Upper Level
FILTER INFLUENTWATERCONDUIT
S S
N
VOID
FILT
ERS
FILT
ERS
FILT
ERS
FILT
ERS
COAG 2 COAG 3
COAG 1 COAG 4
COAGWATERCONDUIT MIXING
CHAMBERS
REMOVE EXISTING GATES AND SEAL ALL OPENINGS
F F
FILTERINFLUENT WATER CONDUIT
LEGEND
NEW WALL
NEW STOP LOGS
NEW GATE
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Project Overview Lower Level
CONTROL CHAMBERVENTURI CHAMBER
FILTERED WATERCONDUIT
66 AND 84 PIPES FROM PS NO 6
VALVE 182
VALVE 183
N
FILT
ERS
ILTE
RS
FILT
ERS
ILTE
RS
COAG 2 COAG 3
COAG 1 COAG 4
WESTCLEARWELL
EASTCLEARWELL
BY-PASSVALVE
MIXING CHAMBERS
LEGEND
NEW GATE (5X5)NEW WALLNEW SEGMENTAL WALLNEW STOP LOGS
F F
FILTERED WATERCONDUIT
Project Overview Critical phase construction
Construction of approx. 500 feet of concrete dividing walls
Modifications to water treatment chemical feed system
Installation of 5 slide gates and 6 stop log gates
Structural surface rehabilitation considered non-critical phase
construction
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Bringing C.H. Filter Plant On-line Why?
Extended FFP shut down needed for FFP Split construction
CHMP capacity (Nov. to Jan.): 40 50 mgdWater demand (Nov. to
Jan.): 50 60 mgd
Preparation work Checked manually-operated valves for each
filter. 17 out of 24 filters available for service Recommissioned
turbidimeters for each filter. Addressed post treatment.
Notified MDH.
Planning Efforts Before Construction Engineer: CH2M Hill
Contractor: Municipal Builders, Inc (MBI)Subcontractor:
PciRoads
Hazardous analysis & notification of Minneapolis Fire Dept.
Confined space Hazardous chemicals (Cl2, NH3)
Coordination with MWW operations & detailed LOTO
proceduresp
Detailed site walkthrough to discuss the construction
process
Detailed day-to-day construction schedule from MBI
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Construction Timeline Sept 30, 2013 Dec 13, 2013: Critical phase
construction and
elective concrete repair/crack injection work Critical phase
construction completed in 37 days
Jan. 2014: FFP restarted
Jan. 2014 Apr. 2014: Remaining concrete repair/crack injection
work & misc. other work
A 2014 95% f i l Apr. 2014: 95% of construction complete
Concrete Dividing Wall Construction Adverse construction
condition
Confined space Ventilation requirements Lighting requirements
Lighting requirements 5-ft tall finished water conduit
On-site construction manager from CH2M Hill performs quality
control & special inspections
28-day cast-in-place concrete strengths: Requirements: 4,500 psi
Testing results: 5,500 psi
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Concrete Dividing Wall ConstructionControlChamberDividerWall
(41longx18tall)
UpperFlumeDividerWall
(96 long x 10 tall) FinishedWaterConduitDividerWall
(300longby5tall)
(96 longx10 tall)
Chemical Feed System Modifications Double feed in the finished
water conduit (poly, Cl2,
Fluoride)
N i f CFE d PE i i h New instruments for CFE and PE monitoring
on the west side
SCADA integration of the new instruments by In Control, Inc.
New CFE and PE sampling pumps
Essentially two separate plant effluents
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Chemical Feed and Sampling Before-Split Scheme
Chemical Feed and Sampling Post-Split Scheme
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Chemical Feed System Modifications
East/WestPoly,Cl2 FluorideCl2,FluorideFeedSystems
NewCFESamplePumps
Slide Gates and Stop Log Gates Installation
5 slide gates and 6 stop llog gates
Build outs for battered wall
MixingChamberSlideGate
UpperFlumeStopLogGate
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Slide Gates and Stop Log Gates Installation
Old Control ChamberInfluent Gate
New Control Chamber Slide Gate
Removal of Coagulation Basin No. 5
Demolition of CoagBasin No. 5
Backfill with granular fill
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Structural Surface Rehabilitation Quantities:
Wall repair: 530 ft2 Slab repair: 1,650 ft2
C k/J i R i 2 360 f Crack/Joint Repair: 2,360 ft
Utilized plant shut down for 80% of concrete repair/crack
injection work
Structural Surface Rehabilitation
10,000 psi high pressure water wash
FWC Pre-project
Rehabilitated FWC
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Structural Surface
RehabilitationRemovalofLooseandDelaminated
Concrete
ReinforcingRebar
CrackRepair
FFP Split Project
Operational redundancy achieved Aggressive yet flexible schedule
met Safety issues for challenging construction
conditions addressed Looking forward to 75 more years of
effective
filt tifilter operations
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Questions?
AnnikaBankstonAnnikaBankstonAnnika.Bankston@[email protected]
61261266166149754975
[email protected]@minneapolismn.gov
61261266166149044904
