Chemical Process
Presence of carbonaceous matter in the sewage

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

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Chemical Process
Linde process of gas liquefaction employs

Exchange of heat with colder stream
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Merely compressing the gas beyond its critical pressure
Adiabatic expansion against a piston or in a turbine

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