Final Complete study guide for wastewater practice exam 2024/2025

Final Complete study guide for wastewater practice exam 2024/2025 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-VKnotch The operator would need to increase or decrease if the ? loading on the plant is high - CORRECT ANSWER-increase/Organic A simple method for indication when to waste sludge is - CORRECT ANSWER-Total sedimentation test Landfill applied sludge must have a solids content of at least ? - CORRECT ANSWER20% Effluent dosage of chlorine in the contact chamber must produce a total combined residual of ? - CORRECT ANSWER-1.0mg/L after 20 minutes TCEQ allows the reuse of wastewater, some of these uses include - CORRECT ANSWER-irrigation, aquifer recharge, cooling towers and fire protection