Wastewater Practice Exam Questions And Answers 2022/2023

Wastewater Practice Exam Questions And Answers 2022/2023 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 C orrect 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? Corre ct 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 w astewater 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 Correc t Answer: Hydrogen sulfide, carbon dioxide and methane The majority of Dissolved Oxygen in raw sewage come from Correct Answer: Potable drinking water Approximately How many pounds does each person contribute of BOD to the system daily Correct Answer: 0.17 If the operator of a system received a call that a lift station is production of a strong smell of "Rotten eggs" this would b e an indication that Cor rect Answer: Hydrogen sulfide gas is present