Tennessee Wastewater Operator Practice Exam

When adjusting the blowers during a waste spill, what is a recommended blow rate to help manage the process?

1. 50%

2. 75%

3. 100%

4. 125%

The correct answer is: 100%

In the context of managing a waste spill, utilizing a blow rate of 100% is often recommended for several reasons. This full rate ensures that there is maximum oxygen transfer into the wastewater treatment system, which is crucial during a spill situation where the organic load may be suddenly increased. Adequate aeration helps promote the growth of aerobic microorganisms, which are essential for the biodegradation of organic matter. By providing this optimal oxygen concentration, the treatment system can enhance microbial activity, promoting faster and more efficient treatment of the waste material. This is particularly important when dealing with a spike in pollutants, as it helps prevent the conditions that could lead to system failure or pass affluent that could violate effluent standards. Other blow rates like 50%, 75%, or 125% may not provide the same level of effectiveness in treating the increased load during a waste spill. A lower blow rate may not deliver sufficient oxygen for the microorganisms to thrive, while rates above 100% could lead to unnecessary energy costs and potential disruptions in the treatment process without providing significant benefits.