☰ Solid Waste and Waste Water Treatment (Civil Engineering) - MCQs

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Q13.

Composting and lagooning are the methods of :

  • A. sludge digestion
  • B. sludge disposal
  • C. sedimentation
  • D. filtration
    ✍ Discuss    
Q14.

When there is no recirculation of sewage, then recirculation factor is :

  • A. 0
  • B. 1
  • C. infinity
  • D. none of these
    ✍ Discuss    
Q15.

BOD is preferred to COD as an index of sewage concentration because :

  • A. COD related to the impurities which can only be removed by chemical treatment which is expensive
  • B. BOD test is easier to perfrom and gives more reliable results
  • C. BOD related specifically to putrescible orgainc matter which is the most objectionable sewage constitument
  • D. BOD represent both carbonaceous and nitrogenous organic matter while amd nitrogenous organic matter while COD may indicate carbonaceous matter only
    ✍ Discuss    
Q16.

The biochemical treatment of sewage effluents is essentially a process of :

  • A. oxidation
  • B. dehydration
  • C. reduction
  • D. alkalinization
    ✍ Discuss    
Q17.

The gas from sludge digestion tank is mainly composed of :

  • A. nitrogen
  • B. carbon diaoxide
  • C. hydrogen sulphide
  • D. methane
    ✍ Discuss    
Q18.

The maximum efficiency of BOD removal is achieved in :

  • A. oxidation pond
  • B. oxidation ditch
  • C. aerated lagoons
  • D. trickling filters
    ✍ Discuss    
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