Chemical Process
Dechlorination of treated water is necessary to

Control taste and odour
Remove chlorinous taste
Remove residual turbidity
Reduce the bacterial load on filter

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Chemical Process
Liquefaction of gases can not be done by

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

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