FLOW THROUGH WATER TREATMENT SYSTEM USING ALUM & PAM
REEDY CREEK IMPROVEMENT DISTRICT
BRIDGE DEMOLITION PROJECT @ EPCOT
WINTER 2000
High Pressure Water Blasting To Remove Concrete Down To Rebar
After Blasting With 15,000 psi Water Jet
Runoff Turbidity Greater Than 300 NTUs
Runoff Diverted Into Bridge Stormwater System
Aluminum Sulfate Added Via Gravity Feed From Trailer Rig
Wood Baffle Boards Skim Large Concrete Debris & Provide Alum Mixing
Runoff Flows Into 1st Cell Of Three Stage Treatment System (Inflow >300 NTU)
1st Stage Treatment:
Inflow >300 NTU
Outflow 30 NTU
2nd Stage Treatment:
Inflow 30 NTU
Outflow 17 NTU
Polyacrylamide (PAM) Floc Log Used For Final Polishing (40-50% Turbidity Reduction) & Free
Aluminum Binding
Final Discharge Water Sheet Flows Over Grass Berm (Trapping Sediment)Then Into Canal
Behind Floating Turbidity Boom
Canal Receiving Water 15 NTU
Final Discharge Water 10-12 NTU
Self Contained Water Treatment System
Treatment System Performance:System Usage: 15 Days
Daily Volume: 80,000 Gallons
Total Pumping Volume: 96 Million Gallons
Alum Usage: 40 Gal / Day (600 Gal Total)
Treatment System Size: 50 x 15 Ft.
Turbidity Reduction (NTU): >300 (Inflow) 15 (Outflow)
% Turbidity Reduction: 95 %
Contractor’s System Cost: < $1,000
Time Lost
Due To Non-Compliance: NONE!
Contractor: Hubbard Construction
Contact: Jeff Forsythe (407)560-0442