Treatment of sunflower oil industry wastewater by coagulation-flocculation and electro-Fenton methods

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ÖZYURT B., CAMCIOĞLU Ş., Karatokus T., Yuksek C., HAPOĞLU H.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, cilt.36, sa.1, ss.275-290, 2021 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 36 Sayı: 1
  • Basım Tarihi: 2021
  • Doi Numarası: 10.17341/gazimmfd.553847
  • Dergi Adı: JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Art Source, Compendex, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.275-290
  • Anahtar Kelimeler: Sunflower oil industry wastewater, coagulation-flocculation, electro-Fenton, graphite electrode, ADVANCED OXIDATION PROCESSES, MILL EFFLUENT, LANDFILL LEACHATE, AQUEOUS-SOLUTION, DRINKING-WATER, COD REMOVAL, ELECTROCOAGULATION, OPTIMIZATION, RED, PH
  • Ankara Üniversitesi Adresli: Evet

Özet

High levels of organic pollutant containing industrial wastewaters which are generated during the production of vegetable oils must be treated before discharge to the receiving environments. In this work, treatment of sunflower oil industry wastewater was performed via coagulation-flocculation, electro-Fenton and sequential operation of these two methods. To determine optimum coagulant concentration, flocculant concentration and pH, coagulation-flocculation studies were carried out under 4, 10, 16 g/L PACl and Al-2(SO4)(3).18H(2)O coagulant concentrations, 0.06, 0.18, 0.3 g/L anionic commercial polyelectrolyte concentrations and 4, 6, 8 pH values, respectively. Results showed a COD removal of 97% under optimum conditions of 10 g/L Al-2(SO4)(3).18H(2)O, 0.06 g/L flocculant concentration and pH 6. Electro-Fenton studies were performed under 1, 2.5, 4 A current intensity, 4.5, 9, 18 g/L FeSO4.7H(2)O concentration, 32.71, 81.77, 130.84 mM H2O2 concentration, and 3, 5.5, 8 pH conditions. Optimum operating conditions for electro-Fenton method were obtained as 1 A, 9 g/L FeSO4.7H(2)O, 130.84 mM H2O2, 6.06 H2O2/Fe2+ molar ratio and pH 3. Treatment under optimum conditions revealed 99% COD removal and 2.37 kWh/m(3) energy consumption for electroFenton method. Sequential coagulation-flocculation-electro-Fenton method under optimum conditions resulted in 98% COD removal and 0.48 kWh/(3) energy consumption at 15 min operation, thus the treated water is dischargeable since COD value (183 mg/L) is below discharge limits.