Environmental Engineering in CE
Which of the following is not a source of ozone emission in the atmosphere?

High voltage electrical equipments
Dermatological photo-therapy equipments
Refrigerators
Xerox machines

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

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

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