Hygiene

Question 1

What are the methods of water purification?

Answer 1

• Coagulation
• Flocculation
• Sedimentation
• Filtration

Question 2

Explain water Coagulation:

Answer 2

• Mixing water with aluminium or Iron salts
  -> Causes the positively charged coagulants to neutralise the negatively charged particles in the water

-> forms flocs known as sludge

Question 3

Explain water flocculation:

Answer 3

• Water is slowly stirred amd mixed
  -> Particles clump together into larger units called flocs

Question 4

Explain water sedimentation:

Answer 4

• Larger particles sink to the bottom of a water source

Question 5

Water filtration:

Answer 5

• Sand, gravel, charcoal
• Biological/ slow sand filters
• Mechanical/ rapid sand filters

Question 6

WHO definition of hygiene?

Answer 6

Hygiene refers to conditions and practices to maintain health and prevent the spread of diseases.

Question 7

University defnition of hygiene?

Answer 7

Hygiene refers to the set of practices percieved by a community to be associated with the preservation of health and healthy living.

Question 8

The main principles of healthy nutrition:

Answer 8

1. 400g of fresh fruit and vegetables
2. reduced intake of animal fats, carbohydrates, salted food and alcohol
3. Milk, cereal and fish should be included
4. Children should eat 5-6 times, adults, 3-4