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Wastewater Treatment Class C Test Questions and Answers, Exams of Water and Wastewater Engineering

A series of questions and answers related to wastewater treatment, specifically focusing on class c certification. It covers various aspects of wastewater treatment processes, including trickling filters, anaerobic digesters, ww ponds, lift stations, and chlorine contact chambers. The questions and answers are designed to test knowledge and understanding of wastewater treatment principles and practices.

Typology: Exams

2024/2025

Available from 12/08/2024

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WASTEWATER CLASS C TEST

QUESTIONS WITH CORRECT

ANSWERS.

What test indicates the efficiency of a trickling filter? -- Answer โœ”โœ” Percent BOD removal The temperature in an anaerobic digester should NOT change more than? -- Answer โœ”โœ” 1 ยฐC per day What does a short circuiting in a WW pond cause? -- Answer โœ”โœ” Decreases detention time What way does a bell spigot go? -- Answer โœ”โœ” Upgrade/upstream or uphill What is the proper PH level for an aerobic digester? -- Answer โœ”โœ” 6. to 7. What is the most important micro-organism in WW treatment? -- Answer โœ”โœ” Bacteria What causes ponding in a trickling filter? -- Answer โœ”โœ” First 6- inches of filter is clogged What must WW ponds have? -- Answer โœ”โœ” Multiple inlets and outlets A pump with a worn out impeller and bearing will? -- Answer โœ”โœ” Pump slower and require more energy than one with a perfect impeller

What is a high corrosive gas in lift stations? -- Answer โœ”โœ” Hydrogen sulfide What is the purpose of floats in a lift station? -- Answer โœ”โœ” Regulate water level, even out wear on pumps What are the disadvantages of a manuel bar screen? -- Answer โœ”โœ” Must be clean regularly What is the ideal effluent pH -- Answer โœ”โœ” 7 Who should remove a lock out tag? -- Answer โœ”โœ” The person who put it, or someone authorized by the one who put it Who signs the monthly reports? -- Answer โœ”โœ” The person authorized to do so/executive official What gives TCEQ jurisdiction over discharges of water into a receiving stream? -- Answer โœ”โœ” The Texas Water Code What is an example of an inorganic material? -- Answer โœ”โœ” Sand, grit, and minerals HTH becomes a fire hazard when it comes into contact with? -- Answer โœ”โœ” A petroleum product What is the minimum amount of oxygen required in a manhole? -- Answer โœ”โœ” 19.5% to 23.5% What is the required detention time for a chlorine contact chamber? -- Answer โœ”โœ” 20 minutes What is the name of the plant that contains both aerator and clarifier in one tank? -- Answer โœ”โœ” SRB (Sequential Batch Reactor) What samples represents a plant throughout the day? -- Answer โœ”โœ” Composite samples according to plant flow

When is it safest to perform maintenance to U.V. lights -- Answer โœ”โœ” After the lockout tag is placed What micro-organism regulates the amount of bacteria in a tank? -- Answer โœ”โœ” Protozoa What indicates bulking sludge during a S.S. test? -- Answer โœ”โœ” Slow settling, fluffy sludge with little to no clear supernatant at the top What causes bulking and raising sludge in clarifier? -- Answer โœ”โœ” Anaerobic conditions in blanket causing denitrification A tank 30ft in diameter fills up 3ft in 1.5 hours what is the pumping rate of the pump in GPM? -- Answer โœ”โœ” 24 Gallons per minute What is the detention time of a tank measuring 14.5ft tall, 50 ft wide, and 25ft long with a flow of 1,200,000 gallons? -- Answer โœ”โœ” Lร—Wร—H 50ร—25ร—14.5= 18,125 Ftยณ 18,125ร—7.48= 135, 135,575ร—24= 3,253, 3,253,800รท1,200,000= 2.5 hours What is the percent BOD reduction of a plant with 214mg/L inflow BOD and 15mg/L effluent BOD? -- Answer โœ”โœ” 93% What is D in the drawing above? -- Answer โœ”โœ” A source of air or oxygen being inserted into an oxidation ditch What is C in the drawing above? -- Answer โœ”โœ” Clarifier; mixed liquor being settled and supernatant in clarifier effluent If you're pumping through a valve ยฝ open and the psi is at 100 and amperage is at 20, what will happen when you open the valve all the way? -- Answer โœ”โœ” Both psi and amperage will drop

Does Cl2 works better with pH of 9 than it does at 6 T or F -- Answer โœ”โœ” True