Utilization of a selective adsorbent for phosphorus removal from wastewaters

Ki Young Park, Ji Hyun Song, Sang Hyup Lee, Han S. Kim

    Research output: Contribution to journalArticlepeer-review

    26 Citations (Scopus)

    Abstract

    In this study, a synthetic layered double hydroxide modified with chloride ions (LDH-Cl) was employed for the removal of phosphorus from wastewaters. A series of phosphate adsorption experiments demonstrated that the adsorption capacity of LDH-Cl was described well by the three-parameter isotherm model (Langmuir-Freundlich combination model). LDH-Cl was found to have ∼50 mg P/g of ion exchange capacity for phosphate, which was sufficient for phosphate recovery from wastewaters. Phosphate adsorption by LDH-Cl also followed pseudo-second-order reaction kinetics. Effective replacement of Cl- with PO43- during sorption was confirmed by X-ray diffraction and Fourier transform infrared analyses. Adsorption capacity varied with pH and reached a maximum value at pH 3. Anions commonly present in most wastewaters, such as nitrate, sulfate, and chloride, had a minimal effect on phosphate adsorption by LDH-Cl. On the contrary, the amount of phosphate ions removed by LDH-Cl decreased with increasing bicarbonate ion concentration. LDH-Cl also exhibited a sufficient chemical stability against adsorption/desorption repetitions and ∼80% of desorption rate was achieved at 5 M NaCl concentration. LDH-Cl exhibited a high phosphate removal capacity and a low sensitivity to the environmental conditions of wastewaters, supporting use as an effective means for the removal of phosphate.

    Original languageEnglish
    Pages (from-to)805-810
    Number of pages6
    JournalEnvironmental Engineering Science
    Volume27
    Issue number9
    DOIs
    Publication statusPublished - 2010 Sept 1

    Keywords

    • Adsorption
    • layered double hydroxide
    • phosphate
    • secondary effluent
    • selectivity

    ASJC Scopus subject areas

    • Environmental Chemistry
    • Waste Management and Disposal
    • Pollution

    Fingerprint

    Dive into the research topics of 'Utilization of a selective adsorbent for phosphorus removal from wastewaters'. Together they form a unique fingerprint.

    Cite this