Important Question And Answer: Water Distribution And Supply To Buildings

Important Question And Answer: Water Distribution And Supply To Buildings

1.What is meant by sludge concentrator unit ?

•        the sludge obtained in a sludge digestion plant contains too much of moisture and is therefore very bulky may be reduced in its moisture content by sending into sludge thicker unit (or) sludge concentrator unit

2.Give different types of thicker unit

•        Gravity thickener

•        Floating thickener

•        Centrifugal  thickener

3.What are the methods of disposal of septic tank effluent?

•        Soil absorption system

•        Biological filters

•         up flow anaerobic filters 4.Define percolation rate

•        peculation rate is defined as the time in minuets required for sewage of water through that ground by one cm

5.what are the soil absorption system

•        dispersion trench

seepage pit (or) soak pit

6.What are the methods of applying sewage effluents to forms ?

•      surface irrigation

•      free flooding

•      border flooding

•      check flooding

7.What is meant by oxygen sag curve?

•      The amount of resultant oxygen deflect can be obtained by algebraically adding the de -oxygenation and re -oxygenation curves. The resultant curve so obtained is called oxygen sag curve

8.What is meant by sewage sickness?

•      The phenomena of soil getting clogged when the sewage is applied continuously on a piece of land is called sewage sickness

9.What are the preventive methods for sewage sickness?

•      Primary treatment of sewage

•      Choice of land

•      Under drainage of soil

•      Giving rest to land and Rotation of crops 10.Define dilution factor

•      The dilution factor is defined as the ratio of the amount of river water to the amount of the sewage

11.What is meant by self purification?

•      The automatic purification of natural water is known as self purification 12.List various natural forces of self purification

•      Physical forces

•      Chemical forces

13.What are the factors affecting the reduction ?

•      Temperature

•      Turbulence effect of wind

•      Hydrographic

•      Available dissolved oxygen

•      Rate of re -aeration

14.What is meant by prim lake pollutant ?

•      The phosphorus which contains in domestic sewage as well as in the industrial waste which affect the water quality of the lake and its called prim lake pollutant

15.What is meant by de oxygenation curve?

•      The curve which represents (or) showing the depletion of D.O with time at the given temperature

16.How the river maintaining its clearness?

•      The turbulence in the water body helps in breaking the surface of the stream and helps in rapid re aeration from the atmosphere. Thus it helps in maintaining aerobic conditions in the stream and keeping it clear

17.Name the biological zone in lakes

•      Euphonic zone

•      Littoral zone

•      Benthic zone

18.What is meant by re -oxygenation?

•      In order to counter balance the consumption of D.O due to the de - oxygenation ,atmosphere supplies oxygen to the water and the process is called the re -oxygenation

19.What is meant by zone of recovery?

•      The zone in which the river water tries to recover from its degraded conditions to its former appearance is called zone of recovery

20.What is meant by sludge banks?

•       When the solid waste are thrown into the sea water, chemical react with the dissolved matter of sea water and resulting in some precipitation of solid waste giving a milky appearance to sea water forming the sludge banks