Corrigendum to “A comparative optimization and performance analysis of four different electrocoagulation-flotation processes for humic acid removal from aqueous solutions” [Process Saf. Environ. Prot. 121 (2019) 103–117]

• Gona HasaniKurdistan University of Medical Sciences
• Afshin MalekiKurdistan University of Medical Sciences
• Hiua DaraeiKurdistan University of Medical Sciences
• Reza GhanbariQazvin University of Medical Sciences
• Mahdi SafariKurdistan University of Medical Sciences
• Gordon McKayHamad bin Khalifa University
• Kaan YetilmezsoyYıldız Technical University
• Fatih İlhanYıldız Technical University
• Nader MarzbanAcademic Center for Education, Culture and Research