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Environmental Engineering in CE

Environmental Engineering in CE
Inhalation of silica dust causes a disease called

None of these
Bronchitis
Pneumoconiosis
Silicosis

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Environmental Engineering in CE
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?

Chemical coagulation
Sedimentation tank
Circular clarifier
Mechanical flocculation

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Environmental Engineering in CE
Iron & manganese present in the polluted water is removed by

Simple filtration
Chlorination only
Chemical coagulation
Oxidation followed by settling & filtration

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Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

0.1
100
1000
25

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Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

7
1
3
20

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Environmental Engineering in CE
Radioactive substances present in the polluted water stream can be removed by

None of these
Biological oxygen treatment
Coagulation and filtration
Adsorption in ion exchange materials

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