Civil Engineering MCQs

Page No. 175

The process of lagooning is primarily a means of________________?


areducing the excessive flow in sewers


bdisposing of sludge


c increasing the capacity of storage re-servoirs


d increasing flow of sewage through imhoff tanks


View Answer disposing of sludge

The gas from sludge digestion tank is mainly composed of __________________?


anitrogen


bcarbon dioxide


chydrogen sulphide


dmethane


View Answer methane

For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be__________________?


aX/4


bX/2


cX


d2X


View Answer X/2

For normal sludge, the value of sludge index for Indian conditions is________________? 0


a0 to 50


b50 to 150


c150 to 350


d 350 to 500


View Answer 150 to 350

For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as___________________?


a4.5 to 6.0


b6.5 to 8.0


c8.5 to 10.0


d10.5 to 12.0


View Answer 6.5 to 8.0

Composting and lagooning are the methods of_______________?


asludge digestion


bsludge disposal


csedimentation


dfiltration


View Answer sludge disposal

In facultative stabilization pond, the sewage is treated by________________?


aaerobic bacteria only


balgae only


cdual action of aerobic bacteria and anaerobic bacteria


dsedimentation



The maximum efficiency of BOD removal is achieved in______________?


aoxidation pond


boxidation ditch


caerated lagoons


d trickling filters


View Answer oxidation ditch

Which of the following unit works in anaerobic conditions ?


asludge digestion tank


bsedimentation tank


c activated sludge treatment


d trickling filters


View Answer sludge digestion tank

If the sewage contains grease and fatty oils, these are removed in_________________?


agrit chambers


bdetritus tanks


cskimming tanks


d sedimentation tanks


View Answer skimming tanks

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