Here are the answers to the Aug. 27, 2020 edition of TPO's Exam Study Guide:

1. When operating a rotary-type distribution trickling filter, what is the recommended method of meeting satisfactory dosing rates during low flow conditions?

The answer to this question is D. During low-flow conditions the rotary-type distribution systems may slow down or stop completely due to lack of hydraulic energy. To overcome this, the operator may increase the recirculation rate to the filter and maintain hydraulic energy, rotation and dosing rate. Understanding how trickling filters operate and what steps to take when problems occur will help the operator advance in his or her career.

2. What is the upper level of a thermally stratified lake called?

The correct answer is D, epilimnion. As the ambient temperature changes with the seasons so does the density of water. The less dense warmer water in the upper level (epilimnion) remains on top as the denser colder water in the lower level (hypolimnion) remains at the bottom. This creates a thermally stratified body of water with mixing only occurring in the epilimnion layer. A total mixing or turnover will not occur until the density of the water in the lake is more uniform. Turnover usually occurs as seasons change from winter to spring and summer to fall.


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