Fill in the blanks in the following statements using words given
in the box.
air, handpumps, cholera, water, large, ground
A very _________ number of our people defecate in the open. It
may cause _________ pollution and soil pollution. Both the
surface water and _________ water get polluted. _________ water
is the source for wells, tubewells and _________. Thus it
becomes the most common route for _________ borne diseases
like _________, dysentery, etc.
The terms sewage, sewers and sewerage are interlinked with
each other. Can you explain, how?
What are the different types of inorganic and organic impurities
generally present in sewage?
A mixture (x) in water contains suspended solids, organic
impurities, inorganic impurities (a), nutrients (b), disease
causing bacteria and other microbes. Give names for (x), (a)
and (b)?
Three statements are provided here which define the terms –
(a) sludge (b) sewage and (c) wastewater. Pick out the correct
definition for each of these terms.
(a) The settled solids that are removed in wastewater
treatment with a scraper.
(b) Water from kitchen used for washing dishes.
(c) Wastewater released from homes, industries, hospitals
and other public buildings.
Given below is a jumbled sequence of the processes involved in
a wastewater treatment plant. Arrange them in their correct
sequence.
(a) Sludge is scraped out and skimmer removes the floating
grease.
(b) Water is made to settle in a large tank with a slope in the
middle.
(c) Large objects like plastic bags are removed by passing
wastewater through bar screens.
(d) Sand, grit and pebbles are made to settle by decreasing
the speed of incoming wastewater.
(e) Wastewater enters a grit and sand removal tank
Why should we not throw
(a) used tea leaves into sink?
(b) cooking oil and fats down the drain?
A man travelling in a train threw an empty packet of food on
the platfrom. Do you think this is a proper waste disposal
method? Elaborate.
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