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This set of MCQs helps students to learn about sewage filtration and activated sludge process which are the process that involves air or oxygen being introduced into a mixture of screened, and primary treated sewage or industrial wastewater (wastewater) combined with organisms to develop a biological floc which reduces the organic content of the sewage.
The intermittent sand filters have better BOD removal efficiency than trickling filters.
Which of the following is called as contact bed?
How many types of trickling filters are used in sewage treatment?
Which of the following filter is used in the anaerobic treatment of sewage?
The maximum removal of suspended and dissolved impurities from the sewage is?
The surface loading rate of a secondary clarifier is ______ litres/m2/day.
Which of the following is the cause of rising sludge?
Hopper bottom vertical flow type tank is _____ in shape.
The minimum weir loading rate of primary clarifier is ____m3/m/day.
The filter material used in contact bed is ___________.
Sand
Stone ballast
Gravel
Fine sand
The depth of the filter media of intermittent filter is ___________.
45cm
60cm
20cm
25cm
The maximum size of filter media of a percolating filter is ___________.
10mm
25mm
60mm
75mm
The recirculation ratio for the low rate trickling filter is ___________.
1
2
3
0
The recirculation ratio for the low rate trickling filter is ___________.
1
2
3
0
The color of the secondary sludge produced from the high rate trickling filter is ___________.
Gray
Black
Brown
Green
The range of organic loading in kg/hectare metre/ day in a high rate trickling filter is ___________.
6000-18000
10000-20000
5000-10000
900-2200
