Optimization of Turbidity Removal from Stormwater Runoff Using Sodium Ferrate as an Effective and Multifunctional Compound

Document Type : Original Research

Authors
Mohammadreza Mallah 1
Daryoush Yousefi Kebria 2
Mofid Gorji-Bandpy 3
1 Master’s student in Environmental Engineering, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran.
2 Associate Professor, Department of Environmental Engineering, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran.
3 Professor, Department of Thermal Engineering and Fluid Mechanics, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran
Abstract
In recent years, increasing turbidity in stormwater runoff has become one of the major concerns in water resource management and environmental protection. This study was conducted with the aim of evaluating the performance of sodium ferrate as an efficient coagulant and oxidizing agent for turbidity removal and stormwater treatment. In this research, the impacts of pH, coagulant dosage, and initial stormwater turbidity were assessed using Design Expert software to investigate their individual and synergistic effects on improving removal efficiency. Results indicated that, at a pH range of 7.5 to 8.5, with sodium ferrate (liquid form) as a coagulant, at dosages of approximately 210 mg/L, and an initial turbidity of 250–300 NTU, turbidity removal efficiency reached up to 85%. Overall, the application of sodium ferrate, due to its simultaneous oxidation and coagulation-flocculation mechanisms, can serve as a sustainable, rapid and promising approach for the treatment of urban stormwater and its safe reuse under water crisis conditions.
Keywords
Stormwater runoff
Coagulation and flocculation
Oxidation
Sodium ferrate
Turbidity removal
Subjects