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South Carolina Physical/Chemical Wastewater Operator Class
C ACTUAL EXAM QUESTIONS AND CORRECT VERIFIED
SOLUTIONS LATEST UPDATE THIS YEAR – JUST RELEASED
Exam Coverage
The South Carolina Physical/Chemical Wastewater Operator Class C certification is
administered by the South Carolina Environmental Certification Board under the Department of
Labor, Licensing and Regulation (LLR) . This intermediate-level certification is designed for
operators of Group II-P/C wastewater treatment plants .
Key Exam Domains Covered:
1. Physical/Chemical Treatment Processes – Coagulation, flocculation, sedimentation,
clarification
2. Chemical Treatment & pH Adjustment – Lime, alum, ferric chloride, polymer addition
3. Disinfection & Chlorination – Chlorine gas, sodium hypochlorite, dechlorination
4. Solids Handling & Sludge Dewatering – Thickening, dewatering, disposal
5. Laboratory Testing & Monitoring – pH, alkalinity, TSS, turbidity, metals analysis
6. Safety & Regulatory Compliance – NPDES permits, OSHA, confined space, PPE
7. Pumps, Valves & Equipment Maintenance – Centrifugal pumps, chemical feed systems
Practice Questions (1-200)
Domain 1: Physical/Chemical Treatment Processes (Questions 1-40)
1. Which of the following is considered a physical characteristic of wastewater?
• A) pH
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• B) Alkalinity
• C) Solids
• D) BOD
Answer: C
Rationale: Solids are a physical characteristic (suspended, dissolved, and settleable solids), while
pH and alkalinity are chemical properties, and BOD is a measure of organic matter
(biological/chemical) .
2. What is the primary function of screening in preliminary treatment?
• A) Remove dissolved gases
• B) Remove large floating and suspended debris
• C) Adjust pH
• D) Disinfect pathogens
Answer: B
Rationale: Screening physically removes large objects (rags, sticks, plastics) and debris to protect
downstream equipment from damage or clogging .
3. Which method is NOT typically used for grit removal?
• A) Aerated grit chamber
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• B) Detritus tank
• C) Gravity thickener
• D) Vortex separator
Answer: C
Rationale: Gravity thickeners are used for solids concentration, not for removing grit. Grit
removal devices include aerated chambers, detritus tanks, and vortex separators .
4. What is the main purpose of primary clarifiers?
• A) Disinfect microorganisms
• B) Settle suspended solids
• C) Remove dissolved gases
• D) Aerate wastewater
Answer: B
Rationale: Primary clarifiers allow heavier solids to settle by gravity, producing a clarified
effluent and a concentrated sludge layer for removal .
5. What is the purpose of flocculation in chemical treatment?
• A) Break apart solids
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• B) Form larger, settleable particles
• C) Increase pH
• D) Remove odor
Answer: B
Rationale: Flocculation gently mixes water to aggregate fine particles into larger flocs that can
settle or be filtered more effectively .
6. Which process is primarily responsible for removing settleable solids in wastewater?
• A) Flotation
• B) Chemical precipitation
• C) Sedimentation
• D) Aeration
Answer: C
Rationale: Sedimentation (or clarification) allows gravity to settle out heavier particles from
wastewater. This is a key physical treatment process .
7. What is the main function of a comminutor in preliminary treatment?
• A) Remove floating debris
South Carolina Physical/Chemical Wastewater Operator Class
C ACTUAL EXAM QUESTIONS AND CORRECT VERIFIED
SOLUTIONS LATEST UPDATE THIS YEAR – JUST RELEASED
Exam Coverage
The South Carolina Physical/Chemical Wastewater Operator Class C certification is
administered by the South Carolina Environmental Certification Board under the Department of
Labor, Licensing and Regulation (LLR) . This intermediate-level certification is designed for
operators of Group II-P/C wastewater treatment plants .
Key Exam Domains Covered:
1. Physical/Chemical Treatment Processes – Coagulation, flocculation, sedimentation,
clarification
2. Chemical Treatment & pH Adjustment – Lime, alum, ferric chloride, polymer addition
3. Disinfection & Chlorination – Chlorine gas, sodium hypochlorite, dechlorination
4. Solids Handling & Sludge Dewatering – Thickening, dewatering, disposal
5. Laboratory Testing & Monitoring – pH, alkalinity, TSS, turbidity, metals analysis
6. Safety & Regulatory Compliance – NPDES permits, OSHA, confined space, PPE
7. Pumps, Valves & Equipment Maintenance – Centrifugal pumps, chemical feed systems
Practice Questions (1-200)
Domain 1: Physical/Chemical Treatment Processes (Questions 1-40)
1. Which of the following is considered a physical characteristic of wastewater?
• A) pH
, Page 2 of 101
• B) Alkalinity
• C) Solids
• D) BOD
Answer: C
Rationale: Solids are a physical characteristic (suspended, dissolved, and settleable solids), while
pH and alkalinity are chemical properties, and BOD is a measure of organic matter
(biological/chemical) .
2. What is the primary function of screening in preliminary treatment?
• A) Remove dissolved gases
• B) Remove large floating and suspended debris
• C) Adjust pH
• D) Disinfect pathogens
Answer: B
Rationale: Screening physically removes large objects (rags, sticks, plastics) and debris to protect
downstream equipment from damage or clogging .
3. Which method is NOT typically used for grit removal?
• A) Aerated grit chamber
, Page 3 of 101
• B) Detritus tank
• C) Gravity thickener
• D) Vortex separator
Answer: C
Rationale: Gravity thickeners are used for solids concentration, not for removing grit. Grit
removal devices include aerated chambers, detritus tanks, and vortex separators .
4. What is the main purpose of primary clarifiers?
• A) Disinfect microorganisms
• B) Settle suspended solids
• C) Remove dissolved gases
• D) Aerate wastewater
Answer: B
Rationale: Primary clarifiers allow heavier solids to settle by gravity, producing a clarified
effluent and a concentrated sludge layer for removal .
5. What is the purpose of flocculation in chemical treatment?
• A) Break apart solids
, Page 4 of 101
• B) Form larger, settleable particles
• C) Increase pH
• D) Remove odor
Answer: B
Rationale: Flocculation gently mixes water to aggregate fine particles into larger flocs that can
settle or be filtered more effectively .
6. Which process is primarily responsible for removing settleable solids in wastewater?
• A) Flotation
• B) Chemical precipitation
• C) Sedimentation
• D) Aeration
Answer: C
Rationale: Sedimentation (or clarification) allows gravity to settle out heavier particles from
wastewater. This is a key physical treatment process .
7. What is the main function of a comminutor in preliminary treatment?
• A) Remove floating debris
