Explain the Function of “Anaerobic Sludge Digester” in a Sewage Treatment Plant. - Biology


Explain the function of “anaerobic sludge digester” in a sewage treatment plant.



An anaerobic sludge digester is a large tank where the anaerobic bacteria digest the bacteria and fungi in the sludge and produce a mixture of gases such as methane, H2S and CO2.

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2014-2015 (March) All India Set 3

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Explain the role of microbes in sewage treatment.

Explain the different steps involved during primary treatment phase of sewage.

What is sewage? In which way can sewage be harmful to us?

What is the key difference between primary and secondary sewage treatment?

Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.

What is primary treatment of sewage?

Removal of large pieces of floating debris, oily substances, etc. during sewage treatment is called _______________.

One of the free-living anaerobic nitrogen-fixer is _________.

Why is this sewage water treatment essential?

Name the tank to which the sewage water is passed after the preliminary treatment?

What are flocs with respect to sewage treatment?

Small part of activated sludge is passed back into primary sedimentation tank.

If the above statement is correct then rewrite as it is and in case it is incorrect then reframe it.

Rearrange the names of tanks used in sewage treatment as per the flow of procedure.

  1. settling tank
  2. Grit Chamber
  3. aeration tanks 
  4. primary sedimentation tank.

The purpose of biological treatment of waste water is to ______.

In which of the following microbial digestion of organic wastes of sewage takes place?

Which of the following occurs during secondary treatment?

Into which of the following the sewage water is pumped after preliminary treatment?

Identify the type of microorganisms involved in floe formation during sewage treatment.

Identify the INCORRECT statement with respect to sewage treatment.

During tertiary treatment, the bacterial floes sediment in the sedimentation tank, this sediment is called ____________.

After which of the following treatment BOD of the effluent is significantly reduced?

Which of the following process is a part of preliminary treatment of sewage?

Nitrogen fixation by organisms requires conditions that are:

During sewage, treatment biogas is produced wits which include:

Which of the following is put into Anaerobic sludge disaster for further sewage treatment?

Methanogenic bacteria are not found in ______.

In a sewage treatment plant, all of the following processes belong to secondary treatment except: 

In which of the following step large and small particles are removed from sewage through sequential filtration and sedimentation?

The primary treatment of waste water involves the removal of ______.

What would happen if oxygen availability to activated sludge flocs is reduced?

Activated sludge should have the ability to settle quickly so that it can ______.

Why are flocs important in biological treatment of waste water?

Why is aerobic degradation more important than anaerobic degradation for the treatment of large volumes of waste waters rich in organic matter. Discuss.

What would happen if a large volume of untreated sewage is discharged into a river?

Study the given diagram of the Sewage Treatment  Plant (S.T.P.) and answer the question that follows:

  1. Which one of the two 'S.T.P.' (A) or (B) will be more effective in treating the human excreta in municipal waste?
  2. Write the steps followed in carrying the treatment of the sewage in step (Z), once the BOD of sewage is reduced significantly till it is passed on to the "anaerobic sludge digesters".

Given below is the flowchart of sewage treatment. Identify A, B, C, D and E and select the correct option.

Which one is wrongly matched?

Explain the steps involved in preliminary treatment of sewage.


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