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ZOO503 GDB 1 Fall 2021

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ZOO510 Assignment 2 Fall 2021 solution idea:

Ans: Solution and suspension form biodegradable substances are remove from polluted water through secondary water treatment . The methods like suspension growth system and extension system are used for the treatment of contaminated water. Human infectious diseases like typhoid, cholera hepatitis and jaundice etc are the serious effects of water pollution especially in developing countries like Pakistan where sanitation is in adequate or even non-existent. Appropriate treatment is require to remove impurities and disease causing agents. Water purification plays a key role in ensuring access to safe drinking water.

Water Treatment Plant

Screening: Lakes, river or ponds passes through screen, by which large natural contaminants such as plants, wood and fish etc are removed.

Flocculation: substances like Potash alum and lime water are added to remove suspended particles called Floc are remove from water.

Sedimentation: Floc settles to the bottom of tank due to its weight.

Filtration: Settled Floc containing water will pass through different filters like sand, gravel and charcoal to remove dissolved particles like dust, parasites, bacteria, viruses and chemicals.

Disinfection: After filtration, a disinfectant like chlorine added to kill remaining parasites, bacteria and viruses and to protect the water from germs.

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