ABC Wastewater Level 3 - Activated Sludge exam with correct answers

ABC Wastewater Level 3 - ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




Activated Sludge exam with correct ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




answers
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Performance problems in the activated sludge process can ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




be caused by ____________.
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A. Poor solids dewatering
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B. Inadequate chlorination of effluent
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C. Consistent influent characteristics
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D. Insufficient operator training - correct answers ✔✔D.
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Insufficient operator training ||\\||\\ ||\\||\\




Solids that float to the surface of the clarifier are referred
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to as ____________.
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A. Mixed liquor
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B. Film ||\\||\\




C. Residual solids
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D. Scum - correct answers ✔✔D. Scum
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,Solids that settle to the bottom of clarifiers and are
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removed from the process are referred to as ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




___________.
A. RAS
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B. WAS
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C. TSS
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D. Total residual chlorine - correct answers ✔✔B. WAS
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Large amounts of filamentous bacteria can improve floc
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structure and speed the settling of the mixed liquor. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




A. True
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B. False - correct answers ✔✔B. False
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Protozoans are much more abundant than bacteria in ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




activated sludge. ||\\||\\




A. True
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B. False - correct answers ✔✔B. False
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,Under normal conditions, fungi (yeast and molds) are
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present in activated sludge processes. ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




A. True
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B. False - correct answers ✔✔B. False
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Algae are microscopic plants that can become a nuisance
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in clarifier launders.
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A. True
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B. False - correct answers ✔✔A. True
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Which of the following does not result from a pH
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imbalance in an activated sludge process? ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




A. Power consumption
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B. Inability to maintain a healthy biomass
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C. Damage to process equipment
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D. Increased cost because of chemical addition - correct
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answers ✔✔A. Power consumption ||\\||\\ ||\\||\\ ||\\||\\

, Because of industrial flows and the nitrification process, ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




pH imbalances may become a concern for activated
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sludge processes if sufficient __________ is not present.
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A. TSS
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B. Alkalinity
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C. Ammonia
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D. BOD - correct answers ✔✔B. Alkalinity
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Which of the following is NOT a phase of a typical
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sequencing batch reactor treatment cycle? ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




A. Filter
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B. Fill
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C. Decant
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D. Settle - correct answers ✔✔A. Filter
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Because multiple steps occur in a single reactor, the ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




sequencing batch reactor process provides little control ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\ ||\\||\\




over effluent quality. ||\\||\\ ||\\||\\




A. True
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