The aerator is driven by a motor with a suitable rating. The speed is reduced from the motor speed to the aerator speed by a suitable reduction gear box having worm/helical gears. The speed of the aerator and the diameter of the impeller are so selected that the aerator will have the optimum oxygen transfer capacity. The motor is reputed to be suitable for outdoor duties. The reducer bearings and gears are oil-lubricated and weather-protected. Our range of manufacturing covers 3.0 HP, 5 HP, 10 HP, 12.5 HP, 15 HP, 20 HP, 25, HP, 30 HP, 40 HP, 50 HP, 60 HP, 75 HP and 100 HP fixed type surface aerators.
How Aerator Works
Aerators consist of a motor mounted to a gear reducer and an extended shaft. A specially designed rotor
is attached to the bottom of the extended shaft. The aerator is positioned so the rotor is partially submerged in the wastewater. When activated, turns at a slow speed (typically 40 to 100 rpm). Specially designed fins on the rotor then pump large amounts of water into the air in a fine spray. These very small droplets create a 360-degree circular pattern. High transfer of oxygen is created by the large surface-to-volume ratio of the water droplet and its long exposure to air after spraying. Pumping up oxygen-deficient water at the bottom of the basin and exposing it to the air above the water surface provides faster mass transfer from ambient air to the water droplet. The deep pumping action of the aerator generates effective localized mixing to optimize many wastewater treatment processes. The aerator is ideal for treatment processes in industries that require fast and efficient oxygen transfer, including pulp and paper, food processing, and other industries.
Basic Installation and Erection Procedures
Shipped in modules and is easy to assemble in the field. It typically requires a crane
and crew of two to four people, depending on the size of the machine.
1. Assemble the rotor.
2. Position the drive mechanism on the rotor. Bolt the rotor to the drive
mechanism.
3. NSA1: bolt the arms to the centre mechanism.
NSA 2, 3 and 4: bolt the arms to the top lugs of the centre mechanism.
4. Install the lower link bars between the centre mechanism and the arms.
5. Bolt the float assemblies to the arms.
6. Fill the gearbox with oil.
7. Use the crane to place the NSA in the water. Hook up the mooring and electric
cable to the machine.
8. Adjust floats for desired rotor immersion.
Mounting Flexibility
The aerator offers flexibility to be configured as a floating or fixed-mounted unit. Each
float-mounted aerator is installed on a “three-pod” pontoon system. The stainless steel
pontoons are filled with closed-cell polymer foam, making a rugged long-life float
system. With a flotation safety factor of 2, a 250-pound (114 kg) operator can safely
step on the fully assembled float and aerator system to check equipment or perform
routine maintenance.
Application Guide
Aerators can be fixed mounted on a platform or float mounted within a basin. Single aerators are used to aerate and mix small tanks while multiple aerators are used in large basins. Tank baffle walls are sometimes used to limit rotational mixing. These aerators can be used in round tanks, rectangular tanks, lagoons or oxidation ditches. Typical positioning is as follows:
Mild steel with hot dip galvanized
SS 304
Download:
Catalogue: Enmech Low-Speed Surface Aerator (SEW)
since 2012 Co. Reg. No: (1007069-M)
For more information or enquiry, please contact Environmech Sdn. Bhd.
Contact us: http://www.environmech.com/p/contact-us.html Website: www.Environmech.com
