Class 7 Science
Wastewater Story
Q.1
Fill in the blanks:
(a) Cleaning of water is a process of removing ____________.
(b) Wastewater released by houses is called ____________.
(c) Dried ____________ is used as manure.
(d) Drains get blocked by ____________ and ____________.
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Q.2
What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.
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Q.3
Why should oils and fats be not released in the drain? Explain.
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Q.4
Describe the steps involved in getting clarified water from wastewater.
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Q.5
What is sludge? Explain how it is treated.
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Q.6
Untreated human excreta are a health hazard. Explain.
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Q.7
Name two chemicals used to disinfect water.
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Q.8
Explain the function of bar screens in a wastewater treatment plant.
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