wastewater practice exam Guide 2024

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 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 Answer 20% 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 Organic solids include - Correct Answer organic materials from plant, animals or humans Dangerous gases are produced during bacterial decomposition of organics in wastewater. The main gases are - Correct Answer Hydrogen sulfide, carbon dioxide and methane