Basic Wastewater Operation Modules 4-6 Exam Questions with Verified Solutions (Rated A+)

Basic Wastewater Operation Modules 4-6 Exam Questions with Verified Solutions (Rated A+) True or False. Domestic waste is uniform in content. - Answers False (not uniformed) True or False. Some wastes cannot be treated in a domestic wastewater treatment plant because the waste would harm the biological process or contaminate the waste sludge. - Answers True True or False. Sources of wastewater include domestic, I & I, food processing, agricultural operations, and industrial operations. - Answers True True or False. By weight, domestic wastewater is about 99.9% water and 1% solids. - Answers False (0.1, not 1) True or False. Flows from domestic sources average about 100 gallons/day per person. - Answers True True or False. Inflow is stormwater that enters a collection system through openings such as house wastewater line cleanouts or open manholes. - Answers True True or False. Infiltration is stormwater that enters the collection system through broken pipe joints, manhole walls, and cracked pipe. - Answers True True or False. I & I floods the collection system, creating flow 5-10 times higher than the daily average. - Answers True True or False. I & I results in bypassing, plant washout, poor treatment, and permit violations. - Answers True Food processing discharges large amounts of _________ material into the wastewater system. A. Liquid B. Inorganic C. Organic D. Solid - Answers C. Organic Pesticides and herbicides used by the agricultural industry can be ________ to the treatment plant biological system. A. Helpful B. Toxic C. Healthy D. Useful - Answers B. Toxic Some industries that may contribute a shock load to the treatment plant are refineries, paper mills, and ________. A. Public restrooms B. Swimming pools C. Garbage disposals D. Metal platers - Answers D. Metal platers EPA requires some industries to pretreat waste before discharge to a ___________. A. POWT B. PTOW C. POTW D. PWTO - Answers C. POTW The most important problem prevented by monitoring or restricting industrial waste is __________. A. Sludge contamination B. Worker exposure C. Effluent pollutants D. Wastewater fires - Answers B. Worker exposure A city's flow rate must exceed how many MGD in order for federal regulations to require an industrial waste control program. A. 5 B. 0.5 C. 50 D. None of the above - Answers A. 5 _____________ results in the rapid die-off of treatment organisms. A. Acute toxicity B. Chronic toxicity C. Acquired toxicity D. Chronicle toxicity - Answers A. Acute toxicity While the TCEQ does not has specific pretreatment standards, _____________________ provides specific pretreatment standards. A. OSHA B. EPA C. USDA D. DOT - Answers B. EPA Which of the following is a type of restricted discharge? A. Create a fire or explosion hazard B. Create toxic conditions C. Cause shock loads D. All of the above - Answers D. All of the above Which of the following is a pretreatment process? A. Spill control B. Metal removal C. pH control D. All of the above - Answers D. All of the above ___________ toxicity causes rapid die-off of treatment organisms. The problem must be corrected to avoid a plant upset or permit violation. - Answers Acute _________ toxicity inactivates microorganisms over days or months. If the toxins accumulate, the treatment process will fail. - Answers Chronic True or False. The purpose of the collection system is to collect and transport waste to the point of treatment. - Answers True True or False. The most important benefit of a collection system is comfort and convenience. - Answers False True or False. Parts of a collection system include wastewater lines, wastewater crossings, inverted siphons, cleanouts, manholes, and lift stations. - Answers True