wastewater practice exam questions with correct answers

Odors occur when treatment becomes CORRECT ANSWER Anaerobic What should an operator do before entering a manhole CORRECT ANSWER Test for all hazardous gases and oxygen levels and ventilate the manhole before entering What treatment devices is commonly used to separate and remove large solids from raw wastewater CORRECT ANSWER a mechanically raked bar screen What diseases are caused by pathogenic organisms that may be present in raw wastewater? CORRECT ANSWER Hepatitis, typhoid, paratyphoid, dysentery, and cholera What is typically used to dewater sludge? CORRECT ANSWER Belt press, Drying beds, solid bowl centrifuge, and gravity thickener Calculated the volume in gallons of a rectangular aeration tank that is 60 feet long, 30 feet wide and 20 feet deep CORRECT ANSWER 269,280 What is typically used whenever wastewater cannot flow to the treatment plant by gravity CORRECT ANSWER Lift station A centrifugal pump must be ? or it will not pump CORRECT ANSWER Primed One common type of weir design for measuring flow is CORRECT ANSWER V-Knotch