Waste Water Treatment Plant Secondary Treatment


 
 
Concept Explanation
 

Waste Water Treatment Plant - Secondary

Secondary treatment: This is a biological process in which the organic matter in the sludge is broken down with the help of bacteria. This process is called digestion and as result of it, biogas is produced. The biogas can be used either as a fuel or to produce electricity. The treatment at this stage can be speeded up by allowing water to flow into large aeration tanks, where air is blown onto the sewage.

What happens to the sludge? Sludge consists of human faeces and other organic matter. It also has large amounts of water and needs to be thickened so that it can be transported easily and used as compost in farmlands.

Oil and grease float at the surface of water are removed by skimmer. Here, water gets cleared of rubbage, oil,grease, etc and we get clarified water which is sent to the aeration tank

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Sample Questions
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Question : 1

Which of the following are correct ?

(a) The biogas produced during the process of digestion in the waste water treatment plant can be used either as a fuel or to produce electricity.

(b) In the waste water treatment plant sludge consists of human faeces and other organic matter. 

(c) In the waste water treatment plant oil and grease float at the surface of water are removed by skimmer. 

Right Option : D
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Question : 2

A sewage treatment prosess in which a portion of the decomposer bacteria present in the waste recycled into the beginning of process is called ________________

Right Option : A
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Question : 3

In a filtration plant, ___________ is filtered using layers of Sand, fine gravel and medium gravel.

Right Option : D
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