Wastewater Treatment Quiz

What is water pollution?

• A change in water quality that is beneficial

• Any chemical, physical or biological change in water quality that is harmful

• A process that purifies water

• A method of treating wastewater

Which of the following is a source of water pollution?

• Rainwater

• Domestic sewage

• Clean rivers

• Filtered water

What does wastewater typically refer to?

• Water that is always clean

• Water that is only from industrial sources

• Water that has been adversely affected by human influence

• Water that is used for irrigation

Which of the following is NOT a characteristic of wastewater?

• Suspended solids

• Biodegradable organics

• Pathogens

• High purity

What is the primary goal of primary treatment in wastewater treatment?

• To remove all pathogens

• To remove a significant portion of solids and BOD

• To disinfect the water

• To treat sludge

What is the purpose of a grit chamber in wastewater treatment?

• To aerate the wastewater

• To disinfect the effluent

• To remove large floating debris

• To remove inert dense materials like sand and gravel

Which treatment process removes approximately 85% of BOD and solids?

• Secondary treatment

• Pre-treatment

• Tertiary treatment

• Primary treatment

What is the role of microorganisms in secondary treatment?

• To stabilize organic material by converting it into gases and protoplasm

• To filter out solids

• To remove heavy metals

• To increase the temperature of the water

What is the main purpose of tertiary treatment?

• To treat sludge

• To remove grit

• To improve effluent quality for reuse

• To remove all pathogens

Which of the following is a method of sludge disposal?

• Incineration

• Filtration

• Aeration

• Chlorination