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KMID : 1024520190280080677
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Journal of the Environmental Sciences
2019 Volume.28 No. 8 p.677 ~ p.687
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A Study on Biosorption of Calcium Ion Using Aerobic Granular Sludge
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Kim Hyun-Gu
Ahn Dae-Hee
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Abstract
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This study evaluated the biosorption properties of calcium ion using Aerobic Granular Sludge (AGS). A sequencing batch reactor was used to induce the production of Extracellular Polymeric Substances (EPS) through salinity injection, and the calcium ion adsorption efficiency was analyzed by a batch test. The EPS contents showed significant changes (104-136 mg/g MLVSS) at different salinity concentrations. The calcium ion adsorption efficiency was highest for AGS collected at 5.0% salinity, and it was confirmed that the biosorption efficiency of AGS was increased owing to the increase in EPS content. The results of the Freundlich isotherms showed that the ion binding strength (1/n) was 0.3941-0.7242 and the adsorption capacity (Kf) was 2.4082-3.3312. The specific surface area and the pore size of the AGS were 586.1 m2/g and 0.7547 nm, respectively, which were not significantly different from each other. It was confirmed that the influence of biological properties, such as EPS content, was relatively large among the factors affecting calcium ion adsorption.
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KEYWORD
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Aerobic granular sludge, Calcium ion, Biosorption, Extracellular polymeric substances, Freundlich isotherm
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