Question:
In the following, one of the resources is extensively used for decolourisation of dye spent liquor
In the following, one of the resources is extensively used for decolourisation of dye spent liquor
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Fly ash is widely used for low-cost wastewater dye removal.
Updated On: Jun 29, 2026
- Sand
- Fly Ash
- Carbon Black
- Husk
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Concept:
Decolourisation of dye spent liquor is an important environmental treatment process in textile wet processing industries. It involves removal of residual dye from wastewater using low-cost adsorbents or industrial waste materials.
Step 1: Understand requirement.
Spent dye liquor contains:
• Unfixed dyes
• Auxiliaries
• Color pollutants
Step 2: Evaluate options.
• Sand → filtration medium, not effective adsorbent
• Carbon black → not used for wastewater treatment
• Husk → limited adsorption capacity
• Fly ash → rich in porous structure and widely used adsorbent
Step 3: Reason for fly ash use.
Fly ash is:
• Highly porous
• Low-cost industrial waste
• Effective adsorbent for dye removal
Step 4: Final conclusion.
\[ \boxed{\text{Fly Ash}} \] Thus, \[ \boxed{\text{Option (B) is correct.}} \]
Step 1: Understand requirement.
Spent dye liquor contains:
• Unfixed dyes
• Auxiliaries
• Color pollutants
Step 2: Evaluate options.
• Sand → filtration medium, not effective adsorbent
• Carbon black → not used for wastewater treatment
• Husk → limited adsorption capacity
• Fly ash → rich in porous structure and widely used adsorbent
Step 3: Reason for fly ash use.
Fly ash is:
• Highly porous
• Low-cost industrial waste
• Effective adsorbent for dye removal
Step 4: Final conclusion.
\[ \boxed{\text{Fly Ash}} \] Thus, \[ \boxed{\text{Option (B) is correct.}} \]
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