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Correspondence to Author: Abolfazl Delashoob. 

Master Student-Chemical Engineering Department- Sharif University of Technology, Tehran, Iran.

DOI: 10.52338/joes.2025.4335

Abstract:

This study investigates the efficacy of a modified Upflow Sludge Blanket Filtration (USBF) system in the biological removal of nitrogen and phosphorus from saline wastewater generated by refineries. In this research, the experimental design was conducted utilizing two retention times of 12 and 24 hours, two nitrogen concentrations of 200 and 400 mg/l, a single phosphorus concentration of 20 mg/l, three levels of Chemical Oxygen Demand (COD) at 800, 1000, and 1200 mg/l, and three salt concentrations of 10, 12, and 20 g/l. The findings reveal that the Chemical Oxygen Demand (COD) removal rate is exceptionally high, ranging from 89.4% to 98.9%. Furthermore, an increase in the nitrification rate correlates with a rise in the quantity of nitrate entering the anaerobic reactor, where the nitrate removal rate fluctuates between 47.9% and 82.8%. The percentage of phosphorus removal is observed to be between 81.7% and 96.1%. These results underscore the effectiveness of the modified Upflow Sludge Blanket Filtration (USBF) system in the treatment of industrial saline wastewater. The system’s capability to concurrently eliminate organic pollutants, nitrogen, and phosphorus positions it as a viable solution for the treatment of complex refinery effluents.

Keywords: USBF System, Saline Wastewater, Refinery, Biological Treatment of Nitrogen, Biological Treatment of Phosphorus.

Citation:

Dr. Abolfazl Delashoob, Effective Removal Of Nitrogen And Phosphorus From Saline Refinery Wastewater Utilizing A USBF Reactor. Journal of Environmental And Sciences 2025.