*/*_Presence of carbonaceous matter in the sewage? – McqOptions

MCQOPTIONS

1.	/_Presence of carbonaceous matter in the sewage?
A.	Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
B.	Reduces sulphate ions to sulphides causing obnoxious smell
C.	Increases the quantity of chlorine used for its purification
D.	All of the above
Answer» E.

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