SCIENCE BLOG – WASTEWATER STORY    

INTRODUCTION

Water is elixir of life.  During our daily use we contaminate water which becomes unfit for use. Dirty water contains soap foam, oil droplets and other contamination. This dirty water flows down from bathroom drains, kitchen sinks, toilet showers and washroom. This phenomenon terms as a wastewater story.

The water which is unfit for human consumption, becomes the source of many water-borne diseases which ultimately lead to loss of human life in wastewater story. We come to know that more than 10 million people do not get pure drinking water. That is why we use to celebrate World Water Day on 22^nd March. It brings awareness in people for safe usable water which is fit for human consumption. Thus, the water is cleaned by removing pollutants before it enters a water body or is reused in. This procedure of treatment of wastewater we term as sewage treatment.

EXTRA QUESTION FOR WASTEWATER STORY CLASS 7:

GIVE REASON TYPE QUESTIONS:

Qs1: Explain, in wastewater story why it is harmful to discharge untreated sewage into rivers or sea?

Ans1: Sewage contains various contaminants including disease-causing bacteria and other microbes, If an untreated sewage is discharged into rivers or sea, then the water in the rivers or sea would get contaminated. If  we drink this polluted water, it may cause various severe diseases like cholera, typhoid, dysentery etc. which may lead to death. That is why, it is harmful to discharge untreated sewage in wastewater story into rivers or sea.

Qs2:  We must not disperse oily substances or leftover oil in drains. Why?

Ans2: Oil and fats hardens and block the sewage pipes.  Fatty residue may clog the pores of open drains which affects the water filtering capacity of soil. Therefore, we should not release fat and oil in the drain.

Qs3: Explain, how airport authority dispose sewage from an aeroplane .

Ans3: Aeroplanes have their closed waste sewage tanks in them, which suck the wastewater and collect it in their tanks.  

 When flights come to land after flight, the crew dispose of the sewage properly into the airport sewage system .

VERY SHORT TYPE QUESTION IN WASTEWATER STORY:

QS4: Wastewater is fit for human consumption or not. Give reason to support your answer.

Ans4:  We should not consume wastewater for any use as it contains many germs of cholera, typhoid etc, and various pollutants.

Qs5: Name two chemicals used to disinfect  wastewater.

Ans5: Chlorine and Ozone.

Qs6: There is a very special toilets we can find in the flight, what is that?

Ans6: Vacuum toilets.

Qs7:Name the toilets used in areas with limited water.

Ans7: Vermi-processing toilets.

Qs8: Name two inorganic impurities present in wastewater.

Ans8: Salts of nitrates and phosphates are the inorganic impurities which we find in the sewage.

 HIGHER ORDER THINKING QUESTION IN WASTEWATER STORY:

QS9: We mix bleaching powder with water, why? Give appropriate reason.

Ans9: Bleaching powder and water mixture makes the safe for drinking because it kills the harmful germs present in water.

Qs10: In wastewater sewage also contains some nutrients. Comment.

Ans10: Sewage  which is a type of wastewater contains  various impurities like organic and inorganic chemical, floating solid particles, various microorganisms causing water transmitted diseases etc.  The nutrients present in sewageare phosphorus and nitrates useful for solid wastewater story.

Qs11: Water in a river is cleaned naturally. Do you agree, explain.

Ans11:  Definitely, just like the wastewater treatment, naturally river water cleans up itself through its streaming. When water full of mud and soil flows in between the land through grass then these small herbs filter out the stream and separate out the mud and solid soil particles. Microbes cause various chemical changes at the sediment part of water body, which makes a big change in water.  By this process we can remove the pollutants and the groundwater becomes potable.

 EXPLAIN THE FOLLOWING IN WASTEWATER STORY

Qs12: There is a relation between sewage, sewers and sewerage terms in wastewater . Can you explain how?

Ans12:  These collective terms have similar relations as these terms have same associations with wastewater story. Because sewage is a  complex mixture substance of solid , liquid and gases. These come due to domestic wastage and commercial purposes. Sewers are pipes which carry sewage and sewerage is a network of sewage carrying pipes .

Qs13: While travelling  someone threw an empty  chips packet outside the vehicle, is it a proper way to dispose waste? Explain?

Ans13: No, one must always put the waste in a nearby dustbin or carry it home and dispose it in dustbins there.  The improper disposed waste may clog the drains by entering. In this way we indirectly make the public places dirty and unhygienic.

 Qs14: Can we contribute in sanitation at public places? Explain.

Ans14: Yes, we all have a role to play in keeping our environment clean and healthy. We should not scatter litter anywhere. In public places there must be dustbin, if we cannot find any dustbin we should not throw these garbages here and there, better we must carry the waste and dispose in our home dustbin.

 LONG ANSWER TYPE QUESTIONS

Qs15:  State the composition of sewage in wastewater ?

Ans15: The components of sewage are:

•  The biological impurities  such as human excreta, animal residue, urea from urine,  disposed oil, fruit peel, vegetable waste, pesticides, herbicides.
• The chemical impurities such as various salts of nitrates, metal phosphates etc.
•  The bacterial presence in sewage including those bacteria which cause water-borne diseases such as cholera and typhoid.

The other microbes present in sewage are protozoa which cause a water-borne disease called dysentery.

VALUE-BASED QUESTION

Qs16: As an active citizen, what are the responsibilities regarding sanitation?

Ans16: We have many responsibilities regarding sanitation as an active citizen:

• We must be aware about our clean surroundings.
•  Our house must have proper sewerage system.
•  If any leakage or any open drain in the sewerage system is present, then we must report to the municipality or the gram panchayats. In this way we can insist to cover the open drain properly. In this way we can prevent several air and water-borne diseases in wastewater story .

Qs17: Discuss vermi-processing toilets. State about its uses.

Ans17: In the vermi-processing toilet, we can treat the human excreta by earthworms in a pit. The earthworms gradually eat up all the organic matter present in human excreta, decompose it and pass out from their body in the form of warm casting which we term as vermi cakes. The vermin cakes are very good quality manure.

Qs18:  How can you minimize the waste which entering the water body followed by water pollution. 

Ans18: We can minimize waste and pollutants entering the water and create less wastewater by taking following few steps at home:

• We should not throw used tea leaves,  remaining solid food in the remaining, rather in the dustbin.
• By not throwing chemicals like medicines, pesticides in the drain, as they increase the pollution load of the sewage.