Chemical Process
Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.

Sulphate/kraft
Neutral sulphite semi-chemical
Mechanical
Sulphite

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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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