Chemical Process
Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of

Ammonium sulphate
Hydrochloric acid
Sulphuric acid
Nitric acid

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Chemical Process
Use of hydrated lime in water treatment

After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂
All of these
Is to adjust the pH value
Before filtration, reduces the bacterial load on filters

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