Wastewater Treatment Operator Certification Practice Exam #2 fully solved graded A+ 2023

Wastewater Treatment Operator Certification Practice Exam #2 fully solved graded A+ 2023What is true about chlorine gas? - correct answer It is 2.5 times heavier than air What is the typical BOD removal efficiency in a primary clarifier? - correct answer 20 to 50% What does the "F" in F/M ratio represent? - correct answer The food for the microorganisms flowing into the aeration tank, in lbs/day What describes the appearance of healthy activated sludge? - correct answer Brown with a moderate amount of crisp, white foam What is used to control filamentous organisms? - correct answer Chlorine What are commonly used to control chlorine feed rate for disinfection? - correct answer Flow and chlorine residual Which toxic gas is commonly found in septic wastewater and smells like rotten eggs? - correct answer Hydrogen sulfide What is the permissible exposure limit for chlorine gas vapor during a normal 8-hour workday and a 40-hour workweek? - correct answer 0.5 ppm What is a vulnerability assessment? - correct answer Contingency planning to determine the vulnerability of the utility during various types of emergencies and identify corrective actions to reduce the risks