A. Coagulation
B. Sterilisation
C. Disinfection
D. Sedimentation
A. Reduction in strength of leather & cloth
B. Acceleration of corrosion rates of metals
C. Increased drying & hardening time of paints
D. All A., B. and C.
A. By chemical coagulation
B. In sedimentation tanks equipped with mechanical scrapper
C. In vacuum filter
D. In clarifiers
A. Calcium
B. Fluorine
C. Phosphorous
D. Sulphur
A. Phenol and cyanide
B. Chlorine
C. Alkalis
D. Suspended solids
A. 90
B. 120
C. 150
D. 180
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.