Question > Category > Water Purification

Q » What is alkalinity consumption during alum coagulation?

John

03 Nov, 2025

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A » Alkalinity consumption during alum coagulation occurs because aluminum sulfate (alum) reacts with water, producing aluminum hydroxide and sulfuric acid. This process reduces the water's pH, necessitating the use of alkalinity to neutralize the acid formed. Adequate alkalinity is crucial for effective coagulation and flocculation, as it ensures proper pH levels for optimal particle removal and prevents corrosion in water systems.

Michael

03 Nov, 2025

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A »Alkalinity consumption during alum coagulation occurs as aluminum sulfate reacts with bicarbonate ions, reducing the water's alkalinity. The reaction produces aluminum hydroxide, which helps remove impurities. For every mole of alum added, approximately 0.5 moles of alkalinity (as CaCO3) are consumed, potentially requiring additional alkalinity adjustment to maintain stable water chemistry.

David

03 Nov, 2025

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