Environmental Engineering in CE
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Biological oxygen demand (BOD)
Bacterial stability factor
Relative stability
Oxygen ion concentration

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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
Destroys/removes pathogen much more effectively if the sewage is chlorinated
Destroys/removes pathogen from the sewage
All of these

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