TEXAS WASTEWATER CLASS A NEWEST ACTUAL EXAM COMPLETE 200 QESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+

1 | P a g e TEXAS WASTEWATER CLASS A NEWEST 2024-2025 ACTUAL EXAM COMPLETE 200 QESTIONS AND CORRECT DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+ Why is recirculation needed in a trickling filter? - ANSWER- a. Keep the media wet b. Further reduce BOD c. Flood the filter to control ponding and filter flies 15. What type of fire extinguisher would be used on an electrical control panel that has been de-energized? - ANSWER- f. a class a and d class c Disinfection with chlorine is the most effective at a pH of - ANSWER- 6.0 17. The biomass on a normal functioning RBC has what appearance? - ANSWER- Grey to brown and 0.05 to 0.1 inch thick The sludge from a primary clarifier should contain what percent solids? - ANSWER- b. 4% to 6% 2 | P a g e What is eutrophication in a pond system? - ANSWEREnrichment with nitrogen and phosphorous Causes algae blooms 20. A wastewater stabilization pond has 130,680 sq. ft. It has a three to one slope on the embankment and has an average depth of 5 ft. Approximately how many people will this pond provide wastewater treatment for? 130,680 sq ft = 3 acres x 35 lbs / BOD/ acre = 105 lbs BOD =618 0.17 lbs BOD/ person 43,560 sq ft l acre - ANSWER- d. 600 A"Racetrack" is what type of Activate Sludge treatment? - ANSWER- Extended air Which form of activated sludge must have primary clarifiers? - ANSWER- Conventional What is the relationship between F/M ratio and MCRT? - ANSWER- Indirect; if one goes up, the other goes down Which activated sludge process does not achieve complete nitrification? - ANSWER- Contact stabilization Which form of activated sludge does the better job of handling shock or toxic loads? - ANSWER- Complete mix 3 | P a g e Which of activated sludge has two aeration basins per single treatment unit? - ANSWER- Contact stabilization 27. A complete mix activated sludge plant has a fast settling sludge and high amounts of pin floc leaving the clarifier. One method of correcting the problem is to - ANSWER- Increase F/M ratio by wasting more problem is Testing of mixed liquor indicates the MLSS is 2500 mg/L and the settling test shows that a 1000 ml sample settles to 400 mls after 30 minutes. What is the SVI? 400 x 1000 2500 160 - ANSWER- 160 In the problem above, what the sludge quality? - ANSWERBulking Which activated sludge process has 18 to 20 + hours detention time in the aeration basin? - ANSWER- Extended air What is the minimum clearance from the sidewall of a pipe to the trench wall in an excavation? - ANSWER- 4 inches 4 | P a g e What is the definition of pH? - ANSWER- The logarithm of the reciprocal of the hydrogen ion concentration The negative logarithm of the hydrogen ion concentration How often should pH meters be calibrated? - ANSWER- Daily trench is 4,100 feet long, four 4 wide and 6 feet deep. There is a 12-inch diameter pipe in the bottom of the trench. How many cubic yards of material were removed from the trench? 4x6x4,100 3,644 27 - ANSWER- 3,644 In the problem above, how many cubic yards of material will be required to fill the trench? 3.14x0.5 x0.5 x 4,100 =119cu yds 27 3,644 -119 = 3,525 - ANSWER- 3,525 What is the standard chlorine residual and contact time on Texas discharge permits? - ANSWER- e. None of the above organization increases, As the complexity of an organization increases, what management function becomes most important? - ANSWERPlanning