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Operator Class C Exam Practice Questions

Class notes Jan 2, 2026 ★★★★☆ (4.0/5)
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South Carolina Biological Wastewater Operator Class C Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

  • Which of the following is the primary purpose of a clarifier in
  • wastewater treatment?

  • Increase dissolved oxygen
  • Remove suspended solids
  • Reduce pH
  • Kill bacteria

Rationale: Clarifiers are designed to settle out suspended solids from

wastewater, allowing for cleaner effluent and reducing the load on subsequent treatment processes.

  • What is the most common type of microorganism responsible for BOD
  • removal in an activated sludge system? 1 / 4

  • Protozoa
  • Algae
  • Bacteria
  • Fungi

Rationale: Bacteria are the primary organisms that metabolize

organic matter in activated sludge, reducing biological oxygen demand (BOD).

  • Which process is most effective for nutrient removal in biological
  • wastewater treatment?

  • Sedimentation
  • Filtration
  • Biological nitrogen and phosphorus removal
  • Chlorination

Rationale: Biological nutrient removal uses specific bacteria to

convert nitrogen and phosphorus into forms that can be removed from wastewater.

  • Which of the following is a symptom of filamentous bacteria
  • overgrowth in activated sludge?

  • High pH
  • Sludge bulking
  • Low BOD
  • Increased effluent chlorine demand 2 / 4

Rationale: Filamentous bacteria can cause sludge to become fluffy

and resist settling, leading to sludge bulking.

  • What is the function of aeration in an activated sludge system?
  • Remove chlorine
  • Provide oxygen for aerobic bacteria
  • Reduce sludge volume
  • Remove heavy metals

Rationale: Aeration supplies dissolved oxygen needed by aerobic

microorganisms to degrade organic matter.

  • Which form of nitrogen is toxic to aquatic life at high concentrations?
  • Nitrate
  • Ammonia
  • Nitrite
  • Organic nitrogen

Rationale: Free ammonia (NH3) is toxic to fish and other aquatic

organisms, especially at higher pH and temperature.

7. In an anaerobic digester, the primary gas produced is:

  • Oxygen
  • Nitrogen
  • Methane
  • Carbon dioxide
  • Rationale: Anaerobic digestion breaks down organic matter in the 3 / 4

absence of oxygen, producing methane as a major biogas component.

  • What does MCRT (Mean Cell Residence Time) control in activated
  • sludge?

  • Influent flow rate
  • Effluent pH
  • Sludge age
  • Chlorine dosage

Rationale: MCRT represents the average time solids remain in the

system, influencing sludge characteristics and process stability.

  • Which is the primary advantage of a trickling filter over activated
  • sludge?

  • Lower land requirements
  • Lower energy requirements
  • Faster BOD removal
  • Better nutrient removal

Rationale: Trickling filters require less mechanical energy because

they rely on passive biofilm processes.

  • A sudden drop in dissolved oxygen in an aeration tank may

indicate:

  • Over-aeration
  • Low BOD load
  • Mechanical failure or high organic load
  • / 4

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Added: Jan 2, 2026
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South Carolina Biological Wastewater Operator Class C Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf 1. Which of the following is the...

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