Name: Water: A Precious Resource
Uploaded: 2019-07-19
Duration: 5 min 52 s
Description: Let's learn about a shortage of water and its preventions, the effect of water scarcity on plants, and the effect on plant bodies if they are not irrigated p...

Question

Match the statements in Column A with those Column B.

Column A	Column B
1. Sewage	(a) Cause of diseases
2. Contamination of drinking water with sewage	(b) Passing through screen
3. First stage of sewage treatment	(c) Chlorination
4. Last stage of sewage treatment	(d) Human excreta, soaps, other liquid wastes from kitchen and toilet

Accepted Answer

1 — (d)

Sewage consists of organic impurities (human faeces, animal wastes, oil vegetable and fruit matter), inorganic impurities (nitrates and phosphates), nutrients, bacteria and other microbes.

2 — (a)

Contamination of drinking water with sewage will allow life-threatening human pathogens carried by sewage include cholera, typhoid and dysentery.

3 — (b)

First stage of sewage treatment is the screening process. The incoming wastewater is passed through a screening equipment where objects such as rags, wood fragments, plastics, and grease are removed. The material removed is washed and pressed and disposed off in a landfill at a different location.

4 — (c)

Chlorination is done to kill disease–causing organisms. Chlorine is used as a disinfectant in the sewage treatment and filtration plants. Sewage is treated to remove all chemical and biological hazards, making it safe to release it into water bodies.

Column A Column B

1. Sewage (d) Human excreta, soaps, other liquid wastes from kitchen and toilet

2. Contamination of drinking water with sewage (a) Cause of diseases

3. First stage of sewage treatment (b) Passing through screen

4. Last stage of sewage treatment (c) Chlorination

Important Questions on Wastewater Management

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