Chemical Process
In the Lurgi coal gasifier

Entrainment of solids is higher
Low carbon conversion efficiency is achieved
Coking coals cannot be used
Large quantity of coal can be processed

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Chemical Process
Presence of carbonaceous matter in the sewage

Increases the quantity of chlorine used for its purification
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

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