Water & Water Purification

1.Sindhu 32 years female, resident of Varanasi frequently bathes in the river Ganges. She brings home water from the river for consumption. She develops a skin condition for which she consults a doctor.

• a) What could be the reason behind the skin condition
• b) Define Safe Water. Enumerate the sources of water
• c) What are the methods for purification of water on small scale
• d) Discuss in detail about rapid sand filter method of water purification
• e) Write a note on the bacteriological quality of drinking water

2.A sample of water from a household is tested for inorganic constituents and it is found to have fluoride level of 15mg/L. Comment on the result and explain about health impact of the same and give remedial measures

3.A sample of water was taken from a house tap and sent for analysis. The chemical analysis showed lead level to be 0.16mg/L. Comment on the quality of water, the impact on health and give remedial measures

1.Methods to remove hardness of water

2.Steps in rapid sand filtration

3.Sanitary well

4.Free residual chlorine should be 0.5 mg/L at the end of chlorination of water List the following

5.Shallow well and deep well

6.Slow and rapid sand filters

7.Precautions in collecting a sample of water for bacteriologic examination

8.Steps in water purification on a large scale

9.Fluorine is a double edged sword

1.You are a PHC medical officer. Field workers report to you about 3 cases of watery diarrhea and dehydration, one of which was severe and was referred. As a medical officer, how will you investigate and control the situation. Comment on the Bacterial indicators of drinking water quality

2.Enlist any two methods for removal of temporary hardness of water

3.E.coli count allowable in drinking water

1.Residual chlorine after disinfection of water is tested by

• 1) Orthotolidine Arsenic test 2) Orthotolidine test
• 3) Methylene blue test 4) Chlorotex test
• a) 1, 3, 4 are correct
• b) 1, 2, 3 are correct
• c) 1 and 2 are correct
• d) 1, 2, 3, 4 are correct