Environmental Engineering in CE
The main industrial source of emission of hydrogen sulphide air pollutant is

Petroleum refineries
Metallurgical roasting & smelting plant
Pulp and paper plant
Coal based thermal power plants

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

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

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