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The Adsorptive Removal of Fluoride from Aqueous Solution by Modified Sludge: Optimization Using Response Surface
Ying Li1,2, Shengke Yang3, Qianli Jiang4
1Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang'an University, Xi'an 710054, China. 15291192057@163.com.
Summary
Water treatment sludge, treated with hydrochloric acid, effectively removes fluoride ions from water. This sustainable method offers a significant adsorption capacity, making sludge a viable coagulant for improving water quality.
Area of Science:
- Environmental Science
- Water Treatment Technology
- Materials Science
Background:
- Fluoride contamination in water poses health risks.
- Water treatment sludge is often a waste product requiring disposal.
- Developing cost-effective and sustainable water purification methods is crucial.
Purpose of the Study:
- To investigate the potential of water treatment sludge as an adsorbent for fluoride removal.
- To optimize the sludge treatment process for enhanced fluoride adsorption.
- To evaluate the performance of treated sludge under various conditions.
Main Methods:
- Sludge treatment using fuel oxidation, pyrolysis, hydrochloric acid, and sulfuric acid.
- Adsorption experiments analyzed using pseudo-first-order and Langmuir isotherm models.
- Optimization of adsorption conditions (sludge dose, pH, fluoride concentration) via Box-Behnken design and response surface methodology.
Main Results:
- Hydrochloric acid treatment significantly enhanced sludge adsorption capacity to 140 mg/kg.
- Adsorption kinetics followed a pseudo-first-order model, and equilibrium data fitted Langmuir isotherms.
- Optimum conditions achieved 81.153% fluoride removal with 14.10 g/L sludge dose at pH 6.12.
Conclusions:
- Water treatment sludge, particularly when treated with hydrochloric acid, is a promising adsorbent for fluoride removal.
- The study demonstrates the feasibility of reusing waste sludge for water purification, offering an eco-friendly solution.
- Optimized conditions provide a practical guideline for applying this method in real-world water treatment scenarios.
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