VNU Journal of Science Earth and Environmental Sciences, Vol 36, No 4 (2020) 1 7 1 Original Article Application of Ferrate as Coagulant and Oxidant Alternative for Purifying Saigon River Water Tran Tien Khoi1, Nguyen Dang Hoang Chuong2, Hoang Gia Phuc1, Nguyen Thi Thuy3, Nguyen Nhat Huy2, 1International University, Vietnam National University Ho Chi Minh City, 6 Linh Trung, Thu Duc, Ho Chi Minh, Vietnam 2Ho Chi Minh City University of Technology, Vietnam National University Ho Chi Minh City, 26[.]