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