Tennessee Wastewater Operator Practice Exam

What is a typical preventative maintenance task for low speed surface aerators?

1. Changing the motor

2. Changing the oil in the drive and greasing the motor

3. Adjusting the aeration depth

4. Increasing the speed of the rotor

The correct answer is: Changing the oil in the drive and greasing the motor

Preventative maintenance for low-speed surface aerators is crucial to ensure their efficient operation and longevity. One of the typical tasks involves changing the oil in the drive and greasing the motor. This maintenance activity is essential because it reduces the wear and tear on mechanical components, minimizes the chances of overheating, and maintains optimal lubrication for moving parts. Proper lubrication helps ensure that the motor operates smoothly, thus enhancing performance and preventing unexpected breakdowns. While changing the motor is a more significant and less frequent task usually prompted by failure or severe wear, regular oil changes and greasing are required to maintain the aerator's functionality. Similarly, adjusting aeration depth and increasing the speed of the rotor might be operational adjustments but do not fit into the category of routine preventative maintenance. Keeping up with these specific maintenance tasks significantly helps in prolonging the life of low-speed surface aerators and keeping the wastewater treatment process efficient.