Electrocoagulation combined with the use of an intermittently aerating bioreactor to enhance phosphorus removal

Biological Oxygen Demand (BOD), nitrogen, and phosphorus were treated with the use of an intermittently aerating bioreactor combined with electrocoagulation. Experiments consisting of batch reactor tests were conducted to identify the most efficient electrode material and the best condition for electrolysis so that the current density would not impede the biological treatment. The operating conditions needed when using an intermittently aerating bioreactor combined with electrocoagulation to enhance phosphorus removal were also identified. Iron was found to be more efficient than aluminum as an electrode material in terms of electricity requirement. When electrocoagulation was conducted and an intermittently aerating bioreactor was used, the electrolysis of the iron electrode in the aerobic stage was observed to be more favorable compared to continuous electrolysis. Sludge rise occurred at the current density of 5.7 mA cm(-2), and lysis of cell at 11.2 mA cm(-2). The applicable current density was found to be less than 4 mA cm(-2). Based on the results of this study, it can be concluded that the use of an intermittently aerating bioreactor combined with electrocoagulation enhances phosphorus removal in sewage treatment plants.