Related Questions

The sewage treatment in septic tanks is due to
A Anaerobic decomposition
B Aerobic decomposition
C Parasitic decomposition
D None of these
__________ substances present in sewage are removed in grit chamber during sewage treatment.
A Organic
B Fatty
C Inorganic
D Dissolved
Which one of the following statements regarding septic tanks is wrong?
A A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
B The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
C The minimum width of septic level is 90 cm
D The depth of tank is kept equal to its width
Septic tanks are used for the __________ of the deposited solids.
A Separation
B Anaerobic decomposition
C Aerobic decomposition
D None of these
In septic tanks,
A Free board of 0.3 m may be provided
B The baffles or tees are extended up to top level of scum
C The clear space between the baffle top and covering slab is about 7.5 cm
D All the above
The rate of accumulation of sludge in septic tanks is recommended as
A 30 litres/person/year
B 25 litres/person/year
C 30 litres/person/month
D 25 litres/person/month
The digested sludge from septic tanks, is removed after a maximum period of
A 3 years
B 3.5 years
C 4 years
D 5 years
In septic tanks, decomposition of organic bacteria, is done by
A Anaerobic bacteria
B Aerobic bacteria
C Both types of bacterias
D None of these
The characteristics of fresh and septic sewage respectively are
A Acidic and alkaline
B Alkaline and acidic
C Both acidic
D Both alkaline
A rectangular tank 10 inch by 8 inch by 4 inch is filled with water. If all of the water is to be transferred to cube-shaped tanks, each one 3 inches on a side, how many of these smaller tanks are needed?
A 9
B 12
C 16
D 21

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