Question

Choose the correct option for each of the following.
1. In the second step of the wastewater treatment plant, the speed of the incoming
wastewater is decreased to
(a) allow the sand, grit and pebbles to settle
(b) allow large objects to settle
(c) allow rags, plastic packets and cans to settle
(d) All of the above
2. Which one of the following is not a method of sewage disposal?
(a) Septic tanks (b) Composting pits (c) Chemical toilets (el) Aerator
3. Which of the following can be used in the production of biogas?
(a) Activated sludge (b) Sludge
(c) Clarified water
4. Which one of the following is used in disinfection of wastewater?
(a) Chlorine
(b) Pumping of air (c) Oxygen
5. Which of the following is an organic contaminant?
(a) Polythene covers (b) Chemicals (c) Glass bottles
(d) Biogas
(d) Food waste​

Answer 1

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1. (d)
2. (e)
3. (b)
4. (a)
5. (d)

Answer 2

Answer:Sewage water is the wastewater that includes domestic and industrial liquid wastes. It contains various suspended solids and harmful microorganisms.

Explanation: