Environmental Engineering in CE
What are the methods of treatment & disposal of radioactive wastes?

Fixing into a solid mass with cement and sinking deep in the sea
All of these
Biological methods & adsorption in ion exchange materials
Evaporation & chemical precipitation

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Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Left as such without any treatment
Diluted with fresh water to reduce its acidity
Neutralised by alkali treatment
None of these

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Environmental Engineering in CE
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

All of these
Coagulation and flocculation of colloids
Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate
Oxidation of carbonaceous matter to CO₂

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