Free NEHA Wastewater Management Questions and Answers — Questions and Answers
Question 1: What is the primary purpose of a wastewater treatment plant?
- To recycle waste into energy
- To remove contaminants from wastewater before discharge (Correct answer)
- To produce potable water from wastewater
- To manage solid waste
Correct answer: To remove contaminants from wastewater before discharge
Wastewater treatment plants are designed to remove contaminants from wastewater to protect public health and the environment before releasing it into water bodies.
Question 2: Which of the following is the first step in the wastewater treatment process?
- Secondary treatment
- Tertiary treatment
- Primary treatment (Correct answer)
- Filtration
Correct answer: Primary treatment
Primary treatment involves screening and sedimentation to remove large solids and some organic matter from wastewater.
Question 3: What is the main goal of secondary wastewater treatment?
- To remove large solids
- To reduce the biochemical oxygen demand (BOD) and suspended solids (Correct answer)
- To disinfect the treated water
- To remove heavy metals
Correct answer: To reduce the biochemical oxygen demand (BOD) and suspended solids
Secondary treatment uses biological processes to further degrade organic matter, reducing BOD and suspended solids in the wastewater.
Question 4: Which process is commonly used for nutrient removal in tertiary wastewater treatment?
- Chlorination
- Biological nutrient removal (BNR) (Correct answer)
- Sedimentation
- Filtration
Correct answer: Biological nutrient removal (BNR)
BNR processes, such as nitrification and denitrification, are used to remove nitrogen and phosphorus from wastewater during tertiary treatment.
Question 5: What is sludge in the context of wastewater management?
- The clean water after treatment
- The solid waste produced from wastewater treatment (Correct answer)
- The chemical used in disinfection
- The gas produced during treatment
Correct answer: The solid waste produced from wastewater treatment
Sludge is the thick, semi-solid byproduct of wastewater treatment, consisting of organic matter, microorganisms, and other solids removed during the treatment process.
Free NEHA Wastewater Management Questions and Answers
What is the primary purpose of a wastewater treatment plant?