1.5 Answer the following questions based on the data given in Fig. 11:
Sewage generation: 61,754 million litres per day
Lletreated sewage: 38.0 milean litres per des
Sewage teatrent capacity: 22.963 million litres
per day
(a) List the possible reasons why we cannot treat all the wastewater that is generated in India.
(6) Explain what will happen to the wastewater that cannot be treated due to a lack of capacity.
(C) Suggest ways in which the untreated wastewater can be dealt with.
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Answers
(a) All the wastewater in India cannot be easily treated because of:
=> Lack of good quality STP'S or sewage treatment plants in good numbers to deal with the sewage.
=> Increasing population increases the amount of sewage and wastewater that is formed.
=> Lack of government funding and credit facilities for setting up of STP'S at important and major cities and towns.
=>Lack of modern technology which is often too expensive to invest in.
=>Lack of public knowledge, initiative and awareness.
6) =>It is directly dumped into rivers, lakes, ponds, bays, estuaries and finally the sea causing heavy water pollution, increasing BOD(Biochemical Oxygen Demand) and faecal coliform levels in waterbodies.
=> It is allowed to seep into the ground through septic tanks and pollutes the water table.
(C) => The untreated wastewater can be sent for preliminary treatment after which it can be utilized for watering non-agricultural plants.
=> It can be used to make compost, fertilizers, in gobar gas plants.