Waste Water practice exam questions and answers with certified solutions

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Waste Water practice exam questions and answers with certified solutions Odors occur when treatment becomes ✔✔Anaerobic What should an operator do before entering a manhole ✔✔Test for all h... azardous 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 If the operator of a system received a call that a lift station is production of a strong smell of "Rotten eggs" this would be an indication that ✔✔Hydrogen sulfide gas is present Sources of wastewater include ✔✔Domestic, Storm water, commercial, food processing, agricultural and industrial A sewer manhole provides access into the system for cleaning or services. A manhole is typically located ? ✔✔At changes in alignment, diameter, grade, direction and intersection Identify the 3 basic types of lift stations ✔✔Dry, Wet and pneumatic How many feet must new manholes have an inside diameter of? Entry access must be at least how many inches? ✔✔4 feet and 30 inches What type of pump most commonly used in a lift station is ✔✔Submersible In order to maintain 2 feet per second and velocity in a 6 inch main line, the fall per 100 feet of pipe will be ✔✔0.50 percent or 6 inches What is the primary cause of stoppage in a collection system ✔✔grease and roots What type of gas is very toxic and deadens the sense of ? ✔✔Hydrogen sulfide/smell Inflow and infiltration typically refers to ✔✔Unaccounted for water in the system after heavy rains [Show More]

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