SOLIDS MANAGEMENT IMPROVEMENT PROJECT TRINITY RIVER AUTHORITY, DALLAS, TX Edward Black | Brandon Boyd | Harrison Bashaw | Noah Throm Sponsors: Kiersten Lee, Em Minner, Esther Nadarajan | Faculty Advisor: Dr. Richard Nielsen | Special Thanks: Dr. Erik Coats and Dr. Dan Cordon
BACKGROUND
COST ESTIMATE
Trinity River Authority Wastewater Treatment Plant
ENGINEER’S OPINION OF PROBABLE COST
• Treats 198 million gallons of wastewater per day • Serves 1.4 million people in Dallas-Fort Worth area • Plant is upgrading processes to advanced mesophilic anerobic digestion
Sludge Parameters: • 25-32% Solids • 0 mg CaCO3/L • pH 7.2-8.4 • 65-75°F
Slurry Parameters: • 6-10% Solids • 8,000-10,000 mg CaCO3/L • pH 7.2-8.4 • 95-105°F
TRANSPORTATION
$647,000
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Mixing 8 batches of sludge per day Each batch takes 75 minutes 17.3 cubic yards of sludge per batch 10,490 gallons of water per batch 2,025 pounds of baking soda per batch Mixing by recirculation pumps and stationary mixers Batches will be sampled via dipstick and tested for all slurry parameters
Time 9:00-9:15 AM 9:15-9:30 AM 9:30-9:45 AM 9:45-10:00 AM 10:00-10:15 AM 10:15-10:30 AM 10:30-10:45 AM 10:45-11:00 AM 11:00-11:15 AM
SITE LAYOUT • • • •
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SLUDGE TRANSPORTATION $357,900 MIXING $42,500 PIPES AND FITTINGS $99,100 PUMPS $11,300 CONCRETE PAD $91,200 ALKALINITY $7,200 15% CONTINGENCY $37,700 TOTAL COST
MIXING
120’ x 165’ concrete pad for temporary systems Sludge offload area on pad’s south side Sludge and baking soda will be stockpiled in transfer area Skid steer will transfer sludge and baking soda from loading area to the mixing basins
Loading x x x x -
Basin 1 Mixing Unloading Loading x x x x x x x
Basin 2 Mixing Unloading Loading x x x x x -
Basin 3 Mixing Unloading x x x
SLURRY HEATING • Shell in Tube heat exchanger using parallel flow • Heating Medium: Steam to Water • Ambient Temperature: 67°F • End Temperature: 100°F • Area: 197ft • Efficiency: 52%
Shipping 35 truckloads of sludge from D.C. to Dallas Shipping 5 trucks full of sludge per day 27.7 cubic yards of sludge per truck Total volume of 961 cubic yards of sludge
Truck schedule Mon Trucks 1-5 Ship Trucks 6-10 Trucks 11-15 Trucks 16-20 Trucks 21-25 Trucks 26-30 Trucks 31-35
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SUSTAINABILITY
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2023 Capstone Project