Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8047407 | Applied Clay Science | 2013 | 8 Pages |
Abstract
Olive mill waste water (OMWW) contains high concentrations of phenols that are responsible for the high toxicity of the effluent. A one step precipitation process of OMWW by cold methanol yielded a polymeric organic precipitate (polymerin) and a supernatant (OMWW-S) rich in phenols, which were further concentrated in an ethyl acetate extract (OMWW-E). This extract was comparatively adsorbed on: i) a layered double hydroxide of magnesium and aluminium (LDH); ii) the LDH after calcination at 450 °C (LDH-450); iii) a hydroxyaluminium-iron-co-precipitate (HyAlFe); and iv) a hydroxy-aluminium-iron-montmorillonite complex (HyAlFe-Mt). Adsorption behaviour and kinetics of phenols with these materials were investigated. The Langmuir model better described adsorption (R2 > 0.97) in comparison to the Freundlich model (R2 > 0.89). Phenols were sorbed according to the following order: LDH-450 > LDH > HyAlFe > HyAlFe-Mt. Phenol adsorption on LDH matrices was strong, since desorption with simulated soil solution under dynamic conditions never exceeded 20%. Cyclic adsorption conducted with LDH-450 removed most phenols, ~ 94% from OMWW-E, consequently reducing its phytotoxicity. The study evidenced that calcined LDH represented an effective remediation process for OMWW.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Antonio De Martino, Marianna Iorio, Paul D. Prenzler, Danielle Ryan, Hassan K. Obied, Michele Arienzo,