Wastewater Collections Exam Questions with 100% Correct Answers

What is a unusually strong wastewater discharged from a waste source? Correct Answer A sock load The four categories of wastewater characteristics are? Correct Answer physical, chemical, bacteriological, and radiological. The amount of wastewater collected depends on? Correct Answer economic status, water rates, climate, infiltration/inflow, and industry. Physical characteristics are detected by the senses such as? Correct Answer smell and sight When anaerobic decomposition begins producing acid and odorous gases.? Correct Answer Begins when dissolved oxygen is gone One mg/L or one ppm is? Correct Answer one pound of material in a million pounds of water. Organics are produced by Correct Answer plants, animals, or humans It is not organic and examples are sand, metal, and rock. Correct Answer "Inorganic" What is toxic, corrosive, flammable, heavier than air, deadens the sense of smell, and has a rotten egg odor. Correct Answer Hydrogen sulfide What is lighter than air, explosive, colorless, and odorless? Correct Answer Methane (natural) gas What Oil and grease in wastewater may cause? Correct Answer explosion, fires,stoppages and odor Excessive chlorides interfere with treatment and effect wastewater ____ Correct Answer lab tests The BOD test indicates the amount of organic matter that can be oxidized by biological and chemical action in how many days at what temperature ? Correct Answer 5 days at 20°C Bacteria requiring free, uncombined oxygen are ________. Correct Answer aerobic Bacteria requiring combined oxygen are ________. Correct Answer anaerobic