Industrial Waste Treatment Certification Exam
Questions and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary purpose of industrial wastewater treatment?
A. Increase water temperature
B. Remove or reduce contaminants before discharge
C. Add nutrients to water
D. Convert wastewater into drinking water
Answer: B
Rationale: Industrial wastewater treatment focuses on removing
harmful pollutants to meet discharge regulations and protect the
environment.
2. Which process is commonly used for removing large solids from
wastewater?
A. Sedimentation
B. Screening
,C. Chlorination
D. Aeration
Answer: B
Rationale: Screening physically removes large debris before further
treatment.
3. What does BOD measure in wastewater?
A. Chemical toxicity
B. Oxygen required by microorganisms to decompose organic matter
C. Total dissolved solids
D. pH level
Answer: B
Rationale: Biochemical Oxygen Demand (BOD) indicates organic
pollution strength.
4. Which unit process uses gravity to separate suspended solids?
A. Filtration
B. Sedimentation
C. Neutralization
D. Coagulation
,Answer: B
Rationale: Sedimentation relies on gravity to settle solids.
5. What is the purpose of coagulation in wastewater treatment?
A. Disinfect water
B. Break down organic matter biologically
C. Destabilize particles for easier removal
D. Increase oxygen levels
Answer: C
Rationale: Coagulation neutralizes charges so particles can clump
together.
6. Which chemical is commonly used for disinfection?
A. Sodium chloride
B. Chlorine
C. Calcium carbonate
D. Ammonia
Answer: B
Rationale: Chlorine is widely used to kill pathogens.
, 7. What is pH a measure of?
A. Temperature
B. Acidity or alkalinity
C. Turbidity
D. Hardness
Answer: B
Rationale: pH indicates how acidic or basic water is.
8. What is the function of an equalization tank?
A. Remove pathogens
B. Balance flow and pollutant load
C. Increase oxygen content
D. Filter solids
Answer: B
Rationale: Equalization tanks smooth out fluctuations in flow and
concentration.
9. Which process removes dissolved organic compounds biologically?
Questions and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant Download Pdf
1. What is the primary purpose of industrial wastewater treatment?
A. Increase water temperature
B. Remove or reduce contaminants before discharge
C. Add nutrients to water
D. Convert wastewater into drinking water
Answer: B
Rationale: Industrial wastewater treatment focuses on removing
harmful pollutants to meet discharge regulations and protect the
environment.
2. Which process is commonly used for removing large solids from
wastewater?
A. Sedimentation
B. Screening
,C. Chlorination
D. Aeration
Answer: B
Rationale: Screening physically removes large debris before further
treatment.
3. What does BOD measure in wastewater?
A. Chemical toxicity
B. Oxygen required by microorganisms to decompose organic matter
C. Total dissolved solids
D. pH level
Answer: B
Rationale: Biochemical Oxygen Demand (BOD) indicates organic
pollution strength.
4. Which unit process uses gravity to separate suspended solids?
A. Filtration
B. Sedimentation
C. Neutralization
D. Coagulation
,Answer: B
Rationale: Sedimentation relies on gravity to settle solids.
5. What is the purpose of coagulation in wastewater treatment?
A. Disinfect water
B. Break down organic matter biologically
C. Destabilize particles for easier removal
D. Increase oxygen levels
Answer: C
Rationale: Coagulation neutralizes charges so particles can clump
together.
6. Which chemical is commonly used for disinfection?
A. Sodium chloride
B. Chlorine
C. Calcium carbonate
D. Ammonia
Answer: B
Rationale: Chlorine is widely used to kill pathogens.
, 7. What is pH a measure of?
A. Temperature
B. Acidity or alkalinity
C. Turbidity
D. Hardness
Answer: B
Rationale: pH indicates how acidic or basic water is.
8. What is the function of an equalization tank?
A. Remove pathogens
B. Balance flow and pollutant load
C. Increase oxygen content
D. Filter solids
Answer: B
Rationale: Equalization tanks smooth out fluctuations in flow and
concentration.
9. Which process removes dissolved organic compounds biologically?
