wastewater practice exam Already Passed!!

Odors occur when treatment becomes - Anaerobic What should an operator do before entering a manhole - 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 - a mechanically raked bar screen What diseases are caused by pathogenic organisms that may be present in raw wastewater? - Hepatitis, typhoid, paratyphoid, dysentery, and cholera What is typically used to dewater sludge? - 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 - 269,280 What is typically used whenever wastewater cannot flow to the treatment plant by gravity - Lift station A centrifugal pump must be ? or it will not pump - Primed One common type of weir design for measuring flow is - V-Knotch The operator would need to increase or decrease if the ? loading on the plant is high - increase/Organic A simple method for indication when to waste sludge is - Total sedimentation test