폐콘크리트를 이용한 수중 불소의 제거 및 흡착 특성

• Published in: 한국수처리학회지, 23(6) pp. 13 - 22
• Main Authors: 구본운, 강구, 박성직
• Format: Journal Article
• Language: Korean
• Published: 한국수처리학회 31.12.2015
• Subjects: 토목공학
• ISSN: 1225-7192; 2289-0076
• DOI: 10.17640/KSWST.2015.23.6.13

Crushed concrete was used for the removal of fluoride from aqueous solution and its adsorption characteristics were investigated. Adsorption experiments have been conducted in batch conditions. From the experiments using crushed concrete thermally treated at different temperatures, it was found that thermal treatment on crushed concrete had a deleterious effect on the fluoride removal. Kinetic sorption test and model analysis showed that fluoride adsorption to crushed concrete was dependent on chemisorption. Equilibrium adsorption results followed the Langmuir adsorption isotherm model with adsorption capacity of 28.50 mg/g. The estimated thermodynamic parameters (ΔH°, ΔS° and ΔG°) indicated that the adsorption was spontaneous and endothermic. Additional batch experiments indicated that fluoride adsorption to crushed concrete was the highest at pH 3 and decreased with increasing pH. The effect of other anion on fluoride removal by crushed concrete followed the order of PO43- > HCO3- > SO42- ≅ NO3-. This study demonstrated that crushed concrete was proven to be an effective adsorbent with high adsorption capacity of fluoride and its use for the fluoride removal is economical and environmentally sustainable. KCI Citation Count: 0