Chemical Process
The only commercial Fischer-Tropsch plant for producing liquid hydrocarbon fuel from coal is located at

SASOL (in South Africa)
Los-Angles (U.S.A.)
Redcar (U.K.)
Trombay (India)

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Chemical Process
Presence of carbonaceous matter in the sewage

All of these
Reduces sulphate ions to sulphides causing obnoxious smell
Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Increases the quantity of chlorine used for its purification

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