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Phosphate Removal from Aqueous Solution by Aluminum (Hydr)oxide-coated Sand
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  • Journal title : Environmental Engineering Research
  • Volume 14, Issue 3,  2009, pp.164-169
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2009.14.3.164
 Title & Authors
Phosphate Removal from Aqueous Solution by Aluminum (Hydr)oxide-coated Sand
Han, Yong-Un; Park, Seong-Jik; Park, Jeong-Ann; Choi, Nag-Choul; Kim, Song-Bae;
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 Abstract
A powder form of aluminum (hydr)oxides is not suitable in wastewater treatment/filtration systems because of low hydraulic conductivity and large sludge production. In this study, aluminum (hydr)oxide-coated sand (AOCS) was used to remove phosphate from aqueous solution. The properties of AOCS were analyzed using a scanning electron microscopy (SEM) combined with an energy dispersive X-ray spectrometer (EDS) and an X-ray diffractometer (XRD). Kinetic batch, equilibrium batch, and closed-loop column experiments were performed to examine the adsorption of phosphate to AOCS. The XRD pattern indicated that the powder form of aluminum (hydr)oxides coated on AOCS was similar to a low crystalline boehmite. Kinetic batch experiments demonstrated that P adsorption to AOCS reached equilibrium after 24 h of reaction time. The kinetic sorption data were described well by the pseudo second-order kinetic sorption model, which determined the amount of P adsorbed at equilibrium ( = 0.118 mg/g) and the pseudo second-order velocity constant (k = 0.0036 g/mg/h) at initial P concentration of 25 mg/L. The equilibrium batch data were fitted well to the Freundlich isotherm model, which quantified the distribution coefficient ( = 0.083 L/g), and the Freundlich constant (1/n = 0.339). The closed-loop column experiments showed that the phosphate removal percent decreased from 89.1 to 41.9% with increasing initial pH from 4.82 to 9.53. The adsorption capacity determined from the closed-loop experiment was 0.239 mg/g at initial pH 7.0, which is about two times greater than that ( = 0.118 mg/g) from the kinetic batch experiment at the same condition.
 Keywords
Aluminum-coated sand;Phosphate removal;Sorption;Batch experiment;Closed-loop column experiment;
 Language
English
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