Wastewater B Test questions with correct answers

Percent of volatile solids normally in sludge CORRECT ANSWER 70-80% D.O. levels in a primary clarifier CORRECT ANSWER 0.5-1.0 MG/L Why are precautionary measures needed around an aeration basin? CORRECT ANSWER undertow and turbulence O.S.H.A. approved trench CORRECT ANSWER narrow excavation in which the depth is greater than the width; the width must be less than 15 feet What causes bulking? CORRECT ANSWER 1. Excessive hydraulic loading, 2. Solids not promptly removed from clarifier 3. Inadequate weir length 4. Improper ratio of depth to surface area of the final clarifier What are the 5 elements of a trickling filter? CORRECT ANSWER 1. Floor 2. under drain 3. Wall containing the filter bed 4. media 5. filter distribution arm When and where are monthly reports submitted? CORRECT ANSWER by the 20th of the following month; submitted to