STM4663 Chapter 4 Wastewater

Which of the following is considered sewage wastewater?

• Stormwater runoff from roads
• Effluent from hospitals and schools
• Industrial wastewater
• Water from rain-fed farms

What is the primary function of preliminary treatment in wastewater management?

• To disinfect pathogens
• To remove large debris and floatables
• To neutralize wastewater
• To increase nutrient content

Which process involves gravitational settling of suspended solids?

• Flocculation
• Sedimentation
• Disinfection
• Chlorination

What is the main purpose of the grit chamber?

• To remove organic matter
• To remove sand and gravel
• To adjust flow rate
• To aerate the water

Which of the following is a biological treatment method?

• Trickling filter
• Filtration
• Activated carbon adsorption
• Granular media filters

What distinguishes facultative ponds from aerobic ponds?

• They are deeper and lack oxygen entirely
• They function both aerobically and anaerobically
• They are used only in cold climates
• They are only used for stormwater

In activated sludge process, what occurs in the aeration tank?

• Solids are removed by flotation
• Microorganisms metabolize organic matter
• Nutrients are removed through filters
• Biogas is collected for reuse

What is the typical removal efficiency of BOD in primary treatment?

• 15%
• 30%
• 45%
• 60%

Which treatment method uses micro-sized air bubbles to remove suspended solids?

• Vacuum filtration
• Dissolved air flotation (DAF)
• Chlorination
• Carbon adsorption

Which of the following is a chemical method for nutrient removal?

• Sedimentation
• Chemical precipitation
• Ion exchange only
• Ozonation only