Project: Naval Air Station Aeration Basins
Location: Jacksonville, Florida
Client: U.S. Navy
Solution: Wastewater Treatment
Technology: Basin aeration with five 40-horsepower Hurricane Submersible Aerator/Mixers
Five submersible Hurricane aerators replaced the fixed-mounted, low-speed aerators in the aeration basin of Jacksonville Naval Air Station Wastewater Treatment Plant, which treats flows of up to 3 million gallons a day.
Submersible self-aspirating Hurricane aerators offer an effective and efficient solution to aerate and mix circular basins up to 13 feet deep, with bottom-up mixing action. These aerators draw air from above the surface, mix it with water and disperse the air/water mixture in a 360-degree pattern near the basin floor. By mixing and aerating from the bottom up, the Hurricane aerators ensure complete solids suspension. Fine air bubbles dispersed at the bottom remain in suspension for an extended period because they first travel horizontally and then rise to the surface. Long bubble hang time results in excellent oxygen transfer, and ensures excellent BOD and ammonia removal.
The aerators, which are completely self-contained, were installed in the basin without draining the tank.
Each Hurricane aerator is equipped with an electronic actuator valve that allows operation in either aeration/mixing or mixing-only mode. The chemical-duty motor is water-cooled, explosion-proof, and designed for longevity and reliability in harsh wastewater environments.
Principle of Operation
The Hurricane self-aspirating aerator’s motor shaft spins the impeller (the only moving part), which creates a low-pressure zone, pulling air from above the water’s surface. Air and water are mixed together efficiently, and the air is broken into fine bubbles by the spinning impeller. The turbulence and flow created by the impeller disperses the air and water mixture through diffuser pipes. The fine air bubbles rise and efficiently mix the water above and around the unit, creating mixing throughout the basin.
The Hurricane’s Technical Features
- Available in 304 or 316 (optional) stainless steel configuration to prevent corrosion, even in the harshest environments
- Stainless steel air intake pipe will not deteriorate from exposure to UV rays
- Hardened 17-4 stainless steel impeller machined from a single piece of steel for added durability against solids
Easy Installation and Low Maintenance
- Freestanding unit means no anchoring is required
- Adjustable legs allow easy leveling of unit on most basin floors without additional level pad
- Units are available from 5 to 100 horsepower (3.75 kW-75 kW)
- Can be operated as an aerator/mixer or just mixer
- Multiple diffuser lengths can adjust for any basin shape to maximize mixing efficiency
- Aerobic digesters
- Sequencing batch reactors (SBR)
- Post-aeration basins
- Sludge holding tanks
- Flow equalization basins
- Deep-tank applications with small surface areas