1.4 Dissolved Air Flotation (DAF)

What is the purpose of adding chemicals in a DAF system?

• To increase water temperature

• To enhance flocculation

• To decrease dissolved oxygen levels

• To speed up sedimentation

Which of the following industries commonly uses DAF systems for wastewater treatment?

• Textile

• Automotive

• Information technology

• Food and beverage

What is the role of the skimmer in a DAF system?

• Removes settled sludge

• Separates oil and grease

• Adds chemicals for treatment

• Facilitates flocculation

In a DAF system, what is the purpose of the flocculation tank?

• To store treated water

• To mix chemicals with water

• To create larger particles for easier flotation

• To control system temperature

What is the typical size range of air bubbles generated in a DAF system?

• Microscopic (less than 1 micron)

• Small (1-100 microns)

• Medium (100-500 microns)

• Large (more than 500 microns)

What is the purpose of the effluent weir in a DAF system?

• To regulate the flow of treated water

• To measure dissolved oxygen levels

• To monitor pH levels

• To control air pressure

Which factor does NOT affect the performance of a DAF system?

• pH level

• Water temperature

• Atmospheric pressure

• Flow rate

What is the primary advantage of using a DAF system over traditional sedimentation methods?

• Faster treatment process

• Lower operational cost

• Higher removal efficiency for small particles

• Minimal space requirement

What is the typical removal efficiency of DAF systems for oil and grease?

• 50-60%

• 70-80%

• 90-95%

• 100%

In a DAF system, what is the purpose of the pressure relief valve?

• To regulate air pressure

• To prevent over-pressurization

• To control flow rate

• To adjust water temperature