The 'activated carbon adsorption' process in water treatment removes:
Choose the correct answer
Total dissolved solids and hardness
Micropollutants, taste/odour compounds, chlorinated organics — adsorb onto large surface area via physical adsorption
Only suspended solids (same as sand filter)
Viruses and bacteria only
Correct Answer
B. Micropollutants, taste/odour compounds, chlorinated organics — adsorb onto large surface area via physical adsorption
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Activated carbon (GAC = granular; PAC = powder): porous structure (BET surface area 500–1500 m²/g). Adsorbs: micro-pollutants (pharmaceuticals, pesticides, endocrine disruptors), taste and odour compounds (geosmin, 2-MIB), chlorinated solvents, colour. Does NOT remove: salts (TDS), nitrate, hardness. Regenerated by heat. Isotherm: Freundlich or Langmuir. Advanced treatment step after sand filter.
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