Environmental Engineering in CE
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water

Both (i) and (iii)
Only (iii)
Only (i)
Both (i) and (ii)

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Environmental Engineering in CE
Aerobic biological oxidation ponds used for the purification of polluted water

Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents
All of these
Destroys/removes pathogen much more effectively if the sewage is chlorinated
Destroys/removes pathogen from the sewage

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