Wastewater Practice Exam Questions
and Answers | Latest Version |
2025/2026 | Correct & Verified
What is the primary purpose of a wastewater treatment plant?
✔✔To remove contaminants from sewage and produce safe effluent for discharge.
Why is screening used at the beginning of wastewater treatment?
✔✔To remove large solids and debris that could damage equipment.
What is the function of a grit chamber?
✔✔To settle out sand, gravel, and other heavy particles.
Why is primary sedimentation important in wastewater treatment?
✔✔To remove settleable solids and reduce organic load.
What is the purpose of aeration in secondary treatment?
✔✔To provide oxygen for microorganisms to degrade organic matter.
1
, Why is sludge digestion performed?
✔✔To stabilize sludge and reduce pathogens before disposal.
What is BOD and why is it measured?
✔✔Biochemical Oxygen Demand; it indicates the organic pollution level in wastewater.
Why is TSS (Total Suspended Solids) monitored in effluent?
✔✔To assess solids removal efficiency and water clarity.
What is the purpose of chlorination in wastewater treatment?
✔✔To disinfect and kill pathogenic microorganisms.
Why is pH control important in wastewater treatment?
✔✔To optimize chemical reactions and biological processes.
What is the difference between primary and secondary treatment?
✔✔Primary removes settleable solids; secondary removes dissolved and suspended organic
matter biologically.
2
and Answers | Latest Version |
2025/2026 | Correct & Verified
What is the primary purpose of a wastewater treatment plant?
✔✔To remove contaminants from sewage and produce safe effluent for discharge.
Why is screening used at the beginning of wastewater treatment?
✔✔To remove large solids and debris that could damage equipment.
What is the function of a grit chamber?
✔✔To settle out sand, gravel, and other heavy particles.
Why is primary sedimentation important in wastewater treatment?
✔✔To remove settleable solids and reduce organic load.
What is the purpose of aeration in secondary treatment?
✔✔To provide oxygen for microorganisms to degrade organic matter.
1
, Why is sludge digestion performed?
✔✔To stabilize sludge and reduce pathogens before disposal.
What is BOD and why is it measured?
✔✔Biochemical Oxygen Demand; it indicates the organic pollution level in wastewater.
Why is TSS (Total Suspended Solids) monitored in effluent?
✔✔To assess solids removal efficiency and water clarity.
What is the purpose of chlorination in wastewater treatment?
✔✔To disinfect and kill pathogenic microorganisms.
Why is pH control important in wastewater treatment?
✔✔To optimize chemical reactions and biological processes.
What is the difference between primary and secondary treatment?
✔✔Primary removes settleable solids; secondary removes dissolved and suspended organic
matter biologically.
2
