Here are the answers to the Nov. 18, 2021 edition of TPO's Exam Study Guide:

Which type of blower may not be operated against a closed valve?
The answer to the question is B, positive displacement blower. Blowers and pumps have similar characteristics. Positive displacement blowers, like positive displacement pumps, may never be operated against a closed valve. If so, damage will occur to the piping, valves and possibly the blowers. This is an unsafe condition that my cause bodily harm to personnel nearby. Only centrifugal or like blowers maybe operated in this manner. Understanding proper blower (or pump) characteristics and methods of operation are vital to safely and efficiently operating the wastewater treatment facility.

The correct answer is D, will cause water to develop an earthy-musty odor. 2-methylisoborneol (MIB) and geosmin are usually the primary cause of biological taste and odor complaints. Depending on the seasonal temperatures, source water nutrient level and other variables, summer and early fall are usually the most problematic. The most common approach in reducing the taste and odor causing compounds is feeding powder activated carbon as a slurry in the treatment process or by installing granular activated carbon as a media in the filter bed. MIB is produced by bacteria (cyanobacteria and actinomycetes) and is released from the cells as the microorganisms die off. MIB and geosmin are problematic because their earthy or musty odor can be detected at very low levels (0.002 to 0.02 ug/L).


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