Removal of phosphate from aqueous solutions by adsorption onto Ca(OH)2 treated natural clinoptilolite

Dimitris Mitrogiannis, Maria Psychoyou, Ioannis Baziotis, Vassilis J. Inglezakis, Nikolaos Koukouzas, Nikolaos Tsoukalas, Dimitrios Palles, Efstratios Kamitsos, Georgios Oikonomou, Giorgos Markou

Research output: Contribution to journalArticle

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Abstract

Phosphorus (P) recovery from wastewater is of great interest especially when the loaded adsorbent can be used in the agriculture as slow-release fertilizer. The application depends on environmental concerns related to the chemical modification of the adsorbent and the release of toxic compounds from the loaded material to the soil or the water during adsorption. The present work focused on the phosphate (PO4-P) removal from aqueous solutions under low P concentrations (0.5–10 mg/L) by using Ca(OH)2-pretreated natural zeolite (CaT-Z). As activation agent, Ca(OH)2 presents benefits in terms of pretreatment costs and environmental impact of the applied adsorbent. The pretreatment of natural zeolite (clinoptilolite) with 0.25 mol/L Ca(OH)2 led to an increase of P removal from 1.7 to 97.6% at initial P concentration of 10 mg/L, pH 7 and 298 K. Low residual concentrations of 81–238 μg P/L were achieved at 298 K rendering CaT-Z a promising sorbent for tertiary wastewater treatment. At 200 mg P/L, the adsorption capacity was 7.57 mg P/g CaT-Z. The P removal efficiency was pH-independent suggesting a beneficial use of CaT-Z under acidic and alkaline conditions. Adsorption was found to be an endothermic and slow process reaching equilibrium after 120 h, whereas the half of the PO4-P was adsorbed in the first 8 h. The applied kinetic models showed that both film and intraparticle diffusion contributed to phosphate removal. Phosphate sorption decreased in the presence of the anionic surfactant SDS, Fe2+, HCO3 , acetate and citrate anion. The predominant mechanisms of ligand exchange and Ca-P surface precipitation were confirmed by the IR-ATR and SEM-EDS analyses, respectively.

Original languageEnglish
Pages (from-to)510-522
Number of pages13
JournalChemical Engineering Journal
Volume320
DOIs
Publication statusPublished - 2017

Fingerprint

clinoptilolite
Phosphates
aqueous solution
phosphate
Adsorbents
adsorption
Zeolites
Adsorption
zeolite
ligand
surfactant
Anionic surfactants
anion
Poisons
acetate
Fertilizers
Chemical modification
environmental impact
sorption
Sorbents

Keywords

  • Diffusion
  • Eutrophication
  • Ligand exchange
  • Phosphate adsorption
  • Surface precipitation
  • Zeolite

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Removal of phosphate from aqueous solutions by adsorption onto Ca(OH)2 treated natural clinoptilolite. / Mitrogiannis, Dimitris; Psychoyou, Maria; Baziotis, Ioannis; Inglezakis, Vassilis J.; Koukouzas, Nikolaos; Tsoukalas, Nikolaos; Palles, Dimitrios; Kamitsos, Efstratios; Oikonomou, Georgios; Markou, Giorgos.

In: Chemical Engineering Journal, Vol. 320, 2017, p. 510-522.

Research output: Contribution to journalArticle

Mitrogiannis, D, Psychoyou, M, Baziotis, I, Inglezakis, VJ, Koukouzas, N, Tsoukalas, N, Palles, D, Kamitsos, E, Oikonomou, G & Markou, G 2017, 'Removal of phosphate from aqueous solutions by adsorption onto Ca(OH)2 treated natural clinoptilolite', Chemical Engineering Journal, vol. 320, pp. 510-522. https://doi.org/10.1016/j.cej.2017.03.063
Mitrogiannis, Dimitris ; Psychoyou, Maria ; Baziotis, Ioannis ; Inglezakis, Vassilis J. ; Koukouzas, Nikolaos ; Tsoukalas, Nikolaos ; Palles, Dimitrios ; Kamitsos, Efstratios ; Oikonomou, Georgios ; Markou, Giorgos. / Removal of phosphate from aqueous solutions by adsorption onto Ca(OH)2 treated natural clinoptilolite. In: Chemical Engineering Journal. 2017 ; Vol. 320. pp. 510-522.
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AU - Psychoyou, Maria

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AU - Inglezakis, Vassilis J.

AU - Koukouzas, Nikolaos

AU - Tsoukalas, Nikolaos

AU - Palles, Dimitrios

AU - Kamitsos, Efstratios

AU - Oikonomou, Georgios

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AB - Phosphorus (P) recovery from wastewater is of great interest especially when the loaded adsorbent can be used in the agriculture as slow-release fertilizer. The application depends on environmental concerns related to the chemical modification of the adsorbent and the release of toxic compounds from the loaded material to the soil or the water during adsorption. The present work focused on the phosphate (PO4-P) removal from aqueous solutions under low P concentrations (0.5–10 mg/L) by using Ca(OH)2-pretreated natural zeolite (CaT-Z). As activation agent, Ca(OH)2 presents benefits in terms of pretreatment costs and environmental impact of the applied adsorbent. The pretreatment of natural zeolite (clinoptilolite) with 0.25 mol/L Ca(OH)2 led to an increase of P removal from 1.7 to 97.6% at initial P concentration of 10 mg/L, pH 7 and 298 K. Low residual concentrations of 81–238 μg P/L were achieved at 298 K rendering CaT-Z a promising sorbent for tertiary wastewater treatment. At 200 mg P/L, the adsorption capacity was 7.57 mg P/g CaT-Z. The P removal efficiency was pH-independent suggesting a beneficial use of CaT-Z under acidic and alkaline conditions. Adsorption was found to be an endothermic and slow process reaching equilibrium after 120 h, whereas the half of the PO4-P was adsorbed in the first 8 h. The applied kinetic models showed that both film and intraparticle diffusion contributed to phosphate removal. Phosphate sorption decreased in the presence of the anionic surfactant SDS, Fe2+, HCO3 −, acetate and citrate anion. The predominant mechanisms of ligand exchange and Ca-P surface precipitation were confirmed by the IR-ATR and SEM-EDS analyses, respectively.

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