reducing the excessive flow in sewers
disposing of sludge
increasing the capacity of storage re-servoirs
increasing flow of sewage through imhoff tanks
oxidation
dehydration
reduction
alkalinization
starch iodide method
orthotolidine method
both starch iodide method and orthotolidine method
none of the above
ultra violet rays treatment
lime treatment
by using potassium permanganate
chlorination
less than 1.0 m/sec
1.0 m/sec to 1.2 m/sec
1.5 m/sec to 2.0 m/sec
3.0 m/sec to 3.5 m/sec