TEXAS Wastewater Class C Exam - Complete Solutions (Answered)

TEXAS Wastewater Class C Exam - Complete Solutions (Answered) An old, over oxidized sludge at an underloaded plant produces mixed liquor solids that A. settle slowly but produce a clear effluent B. Settle rapidly leaving a turbid supernatant. C. Cannot nitrify but turn septic readily in the final clarifier D. All the above E. None of the above. The Correct operational response to a gently settling sludge which stays in the bottom two feet of the clarifier and produces a clear final effluent is to A. Increase return sludge flow rate B. Decrease return sludge flow rate C. Increase sludge wasting D. Decrease sludge wasting E. continue with past operating practices. Certain violations at a WWTP require written notice within 5 days to the Executive Director of the TCEQ. What would be a reason? A. Exceed the permitted limit by more than 40% B. Endangers human health C. Operator bypasses treatment without prior authorization D. All of the above Who can sign the effluent Discharge Monitoring Report? Operator with signature authorization and an executive or official of the permittee True or False: Chlorine disinfection works better at a PH of 9 rather than 6 False Pooling on a trickling filter can be caused by Increased BOD strength entering the plant If the disinfection residual after 20 min is between 1mg/l and 4 mg/l but E.coli is exceeding the permitted value what could be the cause Bacteria and algae sloughing off of the clarifier weirs Granular HTH is explosive or flammable when mixed with what? Petroleum products When working on an open channel uv system one should? Use Lock Out/ Tag Out procedures before beginning work What must you do before placing a pump back into service that has been locked out Find the person that applied the LOTO and have him remove it once the pump is ready Effluent should be Neutralized so it does not adversely affect the aquatic life. What should the PH be A. 2 B. 4 C. 7 D. 10 E. 12 A centrifugal pump running at 100% with restricted flow is registering 40 amps. If the pump is changed to run at 50% and the restriction is removed causing increased flow. What happens to the number of amps? A. Increase B. Decrease C. Stays the same D. Does not Change The chlorine room is required to have two air vents. One is a forced air fan at the top where should the vent on the opposite wall be placed? A. At the top B. Half way up the wall C. At the Bottom Carbon Dixoide is hazrdous in a closed environment In an activated sludge plant this could Makes up 3-4% of normal sludge gas The required detention time for a chlorine contact chamber is how many minutes? A. 5 B. 10 C. 15 D. 20 E. 25 If a treatment plant has a high air flow rate and it is not overloaded with BOD, what could be the cause of low dissolved oxygen. Leaks in the air lines, and plugged diffusers