wastewater practice exam Questions and Answers 2024 with complete solution

wastewater practice exam Questions and Answers 2024 with complete solution 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 Landfill applied sludge must have a solids content of at least ? 20% Effluent dosage of chlorine in the contact chamber must produce a total combined residual of ? 1.0mg/L after 20 minutes TCEQ allows the reuse of wastewater, some of these uses include irrigation, aquifer recharge, cooling towers and fire protection Organic solids include organic materials from plant, animals or humans Dangerous gases are produced during bacterial decomposition of organics in wastewater. The main gases are Hydrogen sulfide, carbon dioxide and methane The majority of Dissolved Oxygen in raw sewage come from Potable drinking water Approximately How many pounds does each person contribute of BOD to the system daily 0.17