Desalination and Water Purification Concepts

The video tutorial explains the difference between potable and pure water, emphasizing that potable water is safe for drinking but contains low levels of dissolved substances. It outlines the steps to produce potable water from fresh and salty sources, highlighting the importance of filtering and sterilization. The video also discusses desalination methods like distillation and reverse osmosis, noting their high energy costs.

What is the main characteristic of potable water?

• It is safe to drink.

• It is the same as pure water.

• It has high levels of microbes.

• It contains no dissolved substances.

Which of the following is NOT a source of fresh water in the UK?

• Aquifers

• Seawater

• Lakes

• Rivers

Which of the following is NOT a characteristic of pure water?

• Contains no dissolved substances

• Safe to drink

• Contains dissolved substances in small amounts

• Chemically pure

What is the main reason potable water is not the same as pure water?

• Potable water is chemically pure

• Pure water contains high levels of microbes

• Potable water contains dissolved substances

• Pure water is unsafe to drink

What is the purpose of passing water through filter beds?

• To remove dissolved salts

• To remove leaves and suspended particles

• To add minerals

• To sterilize the water

Which method is commonly used in the UK to sterilize potable water?

• Chlorine

• Boiling

• Ultraviolet light

• Ozone

Why is desalination necessary in some countries?

• Because it is cheaper than using fresh water

• Because fresh water is scarce

• Because seawater is easy to process

• Because fresh water is abundant

What is the main challenge of desalination?

• It is a quick process

• It is inexpensive

• It increases the levels of dissolved minerals

• It requires large amounts of energy

Which of the following is a method of desalination?

• Sedimentation

• Chlorination

• Distillation

• Filtration

What is reverse osmosis used for?

• To remove microbes from water

• To add minerals to water

• To increase the salt content in water

• To reduce dissolved minerals in water