A. Biological oxygen pond
B. Aerated lagoons
C. Trickling filters
D. Gravity separator having oil skimming devices
A. 85
B. 105
C. 125
D. 145
A. Soluble and toxic organics
B. Suspended solids
C. Heavy metals and cyanides
D. All A., B. & C.
A. 0.1
B. 1
C. 5
D. 25
A. 1-2
B. 5-10
C. 150-300
D. 2000-3000
A. Simple filtration
B. Oxidation followed by settling & filtration
C. Chemical coagulation
D. Chlorination only
A. 0.5
B. 17
C. 357
D. 1097
A. Destroys/removes pathogen from the sewage
B. Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents
C. Destroys/removes pathogen much more effectively if the sewage is chlorinated
D. All A., B. & C.
A. Dental cavity
B. Tooth decay
C. Fluorosis
D. Respiratory disease
A. Photochemical smog
B. Peroxyacetyl nitrate (PAN) or methyl nitrite
C. Benzopyrene
D. Polyacrylonitrile