Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
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
1 / 4
What test indicates the efficiency of a trickling filter? -- Answer โโ Percent BOD removal The temperature in an anaerobic digester should NOT change more than? -- Answer โโ 1 ยฐC per day What does a short circuiting in a WW pond cause? -- Answer โโ Decreases detention time What way does a bell spigot go? -- Answer โโ Upgrade/upstream or uphill What is the proper PH level for an aerobic digester? -- Answer โโ 6. to 7. What is the most important micro-organism in WW treatment? -- Answer โโ Bacteria What causes ponding in a trickling filter? -- Answer โโ First 6- inches of filter is clogged What must WW ponds have? -- Answer โโ Multiple inlets and outlets A pump with a worn out impeller and bearing will? -- Answer โโ Pump slower and require more energy than one with a perfect impeller
What is a high corrosive gas in lift stations? -- Answer โโ Hydrogen sulfide What is the purpose of floats in a lift station? -- Answer โโ Regulate water level, even out wear on pumps What are the disadvantages of a manuel bar screen? -- Answer โโ Must be clean regularly What is the ideal effluent pH -- Answer โโ 7 Who should remove a lock out tag? -- Answer โโ The person who put it, or someone authorized by the one who put it Who signs the monthly reports? -- Answer โโ The person authorized to do so/executive official What gives TCEQ jurisdiction over discharges of water into a receiving stream? -- Answer โโ The Texas Water Code What is an example of an inorganic material? -- Answer โโ Sand, grit, and minerals HTH becomes a fire hazard when it comes into contact with? -- Answer โโ A petroleum product What is the minimum amount of oxygen required in a manhole? -- Answer โโ 19.5% to 23.5% What is the required detention time for a chlorine contact chamber? -- Answer โโ 20 minutes What is the name of the plant that contains both aerator and clarifier in one tank? -- Answer โโ SRB (Sequential Batch Reactor) What samples represents a plant throughout the day? -- Answer โโ Composite samples according to plant flow
When is it safest to perform maintenance to U.V. lights -- Answer โโ After the lockout tag is placed What micro-organism regulates the amount of bacteria in a tank? -- Answer โโ Protozoa What indicates bulking sludge during a S.S. test? -- Answer โโ Slow settling, fluffy sludge with little to no clear supernatant at the top What causes bulking and raising sludge in clarifier? -- Answer โโ 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 โโ 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 โโ LรWรH 50ร25ร14.5= 18,125 Ftยณ 18,125ร7.48= 135, 135,575ร24= 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 โโ 93% What is D in the drawing above? -- Answer โโ A source of air or oxygen being inserted into an oxidation ditch What is C in the drawing above? -- Answer โโ 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 โโ Both psi and amperage will drop
Does Cl2 works better with pH of 9 than it does at 6 T or F -- Answer โโ True