Combination of electrocoagulation and electrooxidation processes for treatment of real wood processing effluents

SAYIN F. E., GENGEÇ E., ÖZBAY B., ÖZBAY İ.

International Journal of Environmental Science and Technology, 2024 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2024
  • Doi Numarası: 10.1007/s13762-024-06255-7
  • Dergi Adı: International Journal of Environmental Science and Technology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Agricultural & Environmental Science Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, CAB Abstracts, Compendex, Environment Index, Geobase, INSPEC, Pollution Abstracts, Veterinary Science Database
  • Anahtar Kelimeler: Electrocoagulation, Electrooxidation, Industrial wastewater treatment, Kinetic parameters
  • Kocaeli Üniversitesi Adresli: Evet

Özet

Wood processing wastewater causes significant damage to the environment due to high organic load, turbidity and color. In this study, the effectiveness of the combination of electrocoagulation and electrooxidation methods for the treatment of wood processing wastewater was evaluated. In the electrocoagulation process, the efficiencies of aluminum and iron electrodes were tested in a wide pH range (3–9) and different current densities (2.5–25 mA/cm2). Aluminum and iron electrodes provided 77.3% and 68.6% TOC removal under optimum conditions. In addition, 99.48% and 95.10% removal efficiencies were obtained for turbidity and color, respectively. Electricity consumption of Al and Fe electrodes were 4.19 w h and 6.36 w h, respectively at 25 mA/cm2. Al electrodes provided better performance for pretreatment of the studied wastewater considering higher TOC removal and lower electricity consumption. In the second step of the study, the effluent of the electrocoagulation process was subjected to electrooxidation. Electrooxidation tests were performed by using Ti/IrO2/SnO2 and Ti/IrO2/RuO2 electrodes. Batch experiments were performed to examine the impacts of different pH values, NaCl dosages and current densities. Ti/IrO2/SnO2 and Ti/IrO2/RuO2 electrodes provided 84.39% and 84.32% TOC removal at pH 4.5, 3 g/L NaCl dosage and 100 mA/cm2 current density. Both electrodes provided superior removal efficiency (≥ 99) for turbidity and color parameters. Calculated kinetic parameters showed that electrocoagulation and electrooxidation followed second-order reaction kinetics.