• Project: Tampa SWRO
• Entity: Tampa Bay Water.
• Location: Tampa, Florida. United States.
• Capacity: 108.831 m³/día.

Objective:

To complete the construction of the desalination plant, and run operations and maintenance for a period of 20 years, as well as provide a solution to operational problems that have been found in the facility since start-up.

Description:

• Raw water is extracted from the refrigeration circuit of the TECO energy plant.
• Dosage of potassium permanganate and chlorine dioxide.
• Pumping of raw water through 4 pumps of 4,088 m³/h.
• Sand filtration: 32 concrete tanks, each with 8 Dynasand filters.
• Safety filtration system composed of 7 selectivity filters with 5 microns.
• High pressure pumping and energy recovery through 7 turbo-pumps, equipped with Pelton turbines.
• 7 frames of 15,540 m3/day of production capacity formed by 168 pressure tubes with 8 aromatic polyamide membranes.
• Remineralisation through Lime and CO².
• Solution applied:
• A strategy to control the macroscopic (Asian green mussel-perna viridis) and microscopic biological soiling, based on chlorine dioxide.
• A coagulation-flocculation chemical process through iron (III) chloride was proposed, as well as adequate hydraulic parameters for the process.
• Consequently, the coagulation-flocculation and sand filtration stages were optimised. However, SDI values were not adequate to be able to pass directly to the reverse osmosis process.
• For this, the filtration process was optimised per prelayer so that the SDI remains under 3.