Miami-Dade County South District Wastewater Treatment Plant
HLD Upgrade Septage Receiving & Solids Process Building, MIAMI, FL
P&K scheduled, coordinated, procured, and executed all aspects of construction of the facilities and process equipment. Completion of the project required extremely close coordination and cooperation with Owner, Engineer and additional contractors. P&K completed the project within the original Contract Time and saved Miami-Dade Water and Sewer Department over $600,000.
Miami-Dade Water and Sewer Department entered into a Consent Decree with the U.S. Environmental Protection Agency (EPA) to upgrade the County’s South District Wastewater Treatment Plant—to incorporate a 285-million-gallon-per-day (mgd) capacity reclaimed water filtrations system. Additionally, the Decree mandated that the facility meet Florida Department of Environmental Protection (FDEP) High Level Disinfection (HLD) reclaimed water standards.
SCOPE OF SERVICES
Of five separate contracts for the largest construction components of this HLD treatment program awarded to P&K—a new 285-mgd filtration system, a 123-mgd capacity effluent pump station, a septage receiving and solids process building, a new oxygenation train (no. 7), and chlorine contact tanks 5 through 9—the septage receiving and solids building is discussed herein.
In February 2010, Poole & Kent Company of Florida (P&K) was awarded the contract for construction of the Septage Receiving and Solids Process Building. Improvements included under the project include the following components:
- A 60,000 square foot multi-level concrete block building to house the septage receiving and biosolids processing equipment. The building is equipped with an HVAC system, office space, toilets, overhead roll-up doors with air curtains for vehicle access, electrical switchgear room, and electrical power and lighting.
- Process equipment housed within the building includes two coarse raw water influent bar screens, four fine bar screens, two spiral screw conveyors, two grit classifiers, and a two-ton traveling bridge crane.
- Cast-in-place concrete receiving channel trough structures for the septage/liquid waste receiving area, including seven stop/slide gates, two 30 horsepower overflow pumps, two grit pumps, and two sludge pumps.
- Two 50,000 gallon reinforced concrete fats, oil, and grease floating tanks equipped with two 72” x 36” weir gates and three 18” x 12” sluice gates.
- An odor-control system consisting of three 60-horsepower blowers for collection of gases, three off-gas scrubbers, and caustic soda (NaOCl) chemical storage and feed systems for the scrubbers.
- Two truck scales with truck wash down
- Approximately 4,000 linear feet of 8-inch, 6-inch, and 4-inch ductile iron pipe (DIP) and CPVC pipe and other extensive yard piping improvements, including one 8-inch hot-tap connection to an existing 54-inch PCCP main.
- Demolition of existing structures and site work associated with the new facility.
- All associated instrumentation and controls.
- Extensive yard electrical demolition and new construction.
In 2004, (MDWASD), in connection with the U.S. EPA, agreed to upgrade the County’s South District Wastewater Treatment Plant to incorporate a 285-million-gallon-per-day capacity reclaimed water filtration system. This facility will be the largest in Florida to treat wastewater to these stringent standards, and the treated wastewater will be reclaimed for use as electrical cogeneration cooling water and for irrigation of green space at Zoo Miami.