3.4 Filtration

What is the fundamental principle behind filtration techniques?

• Evaporation of impurities

• Separation of particles from a fluid by passing through a porous material

• Chemical transformation of contaminants

• Magnetic attraction of impurities

Which of the following filtration techniques is used to separate solid particles from a liquid using a filter paper and a funnel?

• Centrifugal Filtration

• Vacuum Filtration

• Gravity Filtration

• Pressure Filtration

Which filtration technique is suitable for removing fine particles and microorganisms from water, making it safe for drinking?

• Gravity filtration

• Granular media filtration

• Cartridge filtration

• Pre-coat filtration

What is the purpose of pre-coat filtration?

• To filter large particles

• To improve filtration efficiency

• To increase filtration speed

• To remove dissolved impurities

Which filtration method is commonly used in water treatment plants for removing impurities like sand and sediment?

• Centrifugal Filtration

• Gravity Filtration

• Multimedia Filtration

• Membrane Filtration

Which filtration technique uses a bed of sand, anthracite, or other granular materials to remove impurities from water?

• Cartridge filtration

• Granular media filtration

• Pre-coat filtration

• Gravity filtration

In pressure filters, how is the filtration process enhanced compared to gravity filters?

• By increasing the size of the filter bed

• By applying external pressure to the liquid

• By using finer filter media

• By reducing the flow rate

What is the main advantage of using diatomaceous earth as a pre-coat material in pre-coat filters?

• It is chemically inert

• It has a high filtration efficiency

• It is easily biodegradable

• It can be regenerated multiple times

What is the most common material used for granular filter media due to its high surface area and ability to remove small particles?

• Plastic beads

• Sand

• Glass wool

• Ceramic rings

What is the purpose of using activated carbon as filter media?

• To remove large particles

• To absorb organic and chemical impurities

• To enhance filtration speed

• To increase filter lifespan