Waste Water Operator Lv 1 Exam Prep Questions with Complete Solutions In the activated sludge process, some of the activated sludge must be wasted to...
- Prevent excessive solid buildup
- Prevent clogging of the sludge return line
- Prevent overloading of sludge return pumps
- Increase digester gas production - Correct Answers ✅A.
- Several time a day
- Large quantities once or twice a day
- Once a day
- When the volatile solids drop below 60% - Correct
- To reduce load on the digester
- To eliminate interference with sludge removal
- To allow aeration of the tank contents 1 / 3
Prevent excessive solid buildup The best operating strategy for feeding primary sludge to an anaerobic digester is to feed...
Answers ✅A. Several time a day Why is scum skimmed from the liquid surface of a primary settling tank?
Waste Water Operator Lv 1 Exam Prep Questions with Complete Solutions
- To reduce odor and insect nuisance - Correct Answers
- Oxygen Uptake Rate (OUR)
- Settleometer
✅B. To eliminate interference with sludge removal Which of the following test would give the fastest indication of toxicity in an activated sludge process?
C. MLSS
- Microscopic Observation - Correct Answers ✅A. Oxygen
- Adding sodium chloride to the aeration tank
- Spraying water on the aeration tank surface
- Carefully chlorinating the return sludge and mixed liquor
- Aerating the final settling tank - Correct Answers ✅C.
Uptake Rate (OUR) Filamentous bulking of activated sludge may be controlled temporarily by...
Carefully chlorinating the return sludge and mixed liquor Since reaction rates are lower during the winter, the operator of an activated sludge plant will usually... 2 / 3
Waste Water Operator Lv 1 Exam Prep Questions with Complete Solutions
- Increase dissolved oxygen levels
- Decrease MCRT
- Decrease wasting
- Increase MCRT - Correct Answers ✅D. Increase MCRT
- Stalked Ciliates
- Amoebas
- Free swimming ciliates
- Nymphs - Correct Answers ✅A. Stalked Ciliates
- Neutralize base
- Neutralize acid
- Dissolve organics
- Maintain constant temperature - Correct Answers ✅B.
- / 3
In a healthy activated sludge process which of the following organisms will most likely be found in the greatest numbers?
Alkalinity is a measure of the ability of wastewater to...
Neutralize acid What is one advantage of a COD test over a BOD test?