One of the purpose of secondary treatment of industrial waste water and sewage is to
A. Increase the chlorine content
B. Reduce the BOD
C. Encourage the formation of PCBs
D. Discharge ammonification
Answer: Option B
This Question Belongs to Biotechnology Engineering >> Environmental Biotechnology
Ozone depletion is caused by the increase in the level of
A. Water vapour
B. Chlorofluro carbon (CFC)
C. Oxygen
D. Carbon monoxide
Which of the following is a beneficial activity of microorganisms?
A. Some microorganisms use carbon dioxide
B. Some microorganisms provide nitrogen for plant growth
C. Some microorganisms are used in sewage treatment
D. All the above
Which of the following parameters indicates the organic pollution of a water sample?
A. pH
B. Turbidity
C. Hardness
D. COD
The chemical system for removal of the ions of level of salt is called
A. Ion transfer
B. Ionization
C. Ion exchange
D. Ion vaporization
Join The Discussion