UV fluorescence, FTIR, and GC–MS analyses and resin fractionation procedures as indicators of the chemical treatability of olive mill wastewater

Betul Hande Gursoy-Haksevenler, Idil Arslan-Alaton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The organic matter content in original, untreated (COD = 150,000 mg/L; TOC = 36,000 mg/L; oil–grease = 8,200 mg/L; total phenols = 3,800 mg/L), and chemically treated olive mill wastewater was examined in detail by instrumental and analytical (resin fractionation) methods. For this purpose, two approaches were followed: (i) UV-fluorescence, FTIR, and GC–MS analyses as well as (ii) structural fractionation assessment employing XAD-8, XAD-4, AG-MP-50, and Duolite A-7 exchange resins to obtain hydrophobic-acidic, basic, neutral, and hydrophilic-acidic, basic, neutral fractions, respectively. Acid cracking (pH 2.0; T = 70°C), FeCl3 coagulation (pH 3.0; FeCl3= 2,500 mg/L) electrocoagulation with stainless steel electrodes (pH 2.0; T = 65°C; A = 50 mA/cm2; t = 120 min), and the Fenton’s reagent (pH 2.0; T = 65°C; 20 mM Fe2+: 200 mM H2O2; t = 120 min) were selected for convenient chemical treatment of the effluent. Resin fractionation analyses of the original wastewater sample indicated that the major organic content composed of hydrophobic moieties (75–95%). The percent relative inhibition of the original wastewater was concentrated in the hydrophobic neutral fraction (100%). By employing instrumental analyses, several organic compounds could be identified. Relatively low molecular weight chemicals were qualified via GC–MS analysis, whereas FTIR results revealed an appreciable loss of aliphatic moieties together with an increase in aromatic structures.

Original languageEnglish
Pages (from-to)2372-2382
Number of pages11
JournalDesalination and Water Treatment
Volume57
Issue number6
DOIs
Publication statusPublished - 1 Feb 2016

Bibliographical note

Publisher Copyright:
© 2014 Balaban Desalination Publications. All rights reserved.

Keywords

  • Acute toxicity
  • Chemical treatment processes
  • Instrumental analyses
  • Olive mill wastewater
  • Structural resin fractionation

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