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Evaluation of removal efficiency of fluoride from aqueous solution using quick lime
1Department of Chemistry, National Institute of Technology, Rourkela 769008, India.
This study shows activated and ordinary quick lime effectively remove fluoride from water, achieving 80.6% removal. However, the method is best for industrial effluent, not domestic use, due to high final fluoride levels and increased pH.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
Background:
- Fluoride removal from aqueous environments faces limitations with existing methods.
- High fluoride concentrations pose environmental and health challenges.
Purpose of the Study:
- To investigate the efficacy of activated and ordinary quick lime for fluoride removal.
- To determine the optimal conditions and mechanisms for fluoride adsorption.
Main Methods:
- Utilized activated and ordinary quick lime for fluoride (F-) removal from synthetic solutions.
- Conducted adsorption kinetic and isotherm studies.
- Analyzed removal mechanisms using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD).
Main Results:
- Achieved 80.6% fluoride removal, reducing concentration from 50 mg/L to 9.7 mg/L under optimal conditions.
- Adsorption kinetics followed first-order kinetics and Langmuir adsorption isotherm.
- SEM and XRD indicated chemisorption and precipitation as primary removal mechanisms.
Conclusions:
- Quick lime effectively removes high concentrations of fluoride, suitable for industrial effluent treatment.
- The method is not recommended for domestic water treatment due to insufficient fluoride reduction and increased pH.
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