Environmental Engineering in CE
Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?

Cyclone separator
Hollow wet scrubber
Dust catcher (gravity type)
Bag filter

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

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

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