Abstract

Novel Electro-Integrated Fixed-film Activated Sludge reactor (EIFAS) to enhance nutrients removal from wastewater
Sara Ranjbar, Master of Applied Science

This study aimed to improve nitrogen removal through developing an Electro-Integrated Fixed-film Activated Sludge reactor. Electrical current controlled redox for both aerobic and anoxic conditions in a single vessel. This complete-mixed reactor ensures the removal of nitrogen and phosphorous. The first phase of this research, which had two phases, focused on ammonia removal from the Integrated Fixed-film Activated Sludge reactor (IFAS) under aerobic conditions with an average dissolved oxygen level of 7 mg/L. Whereas, the second phase was focused on nutrient removal in a novel Electro-Integrated Fixed-film Activated Sludge reactor (EIFAS). The results of this study showed a promising nitrification process in IFAS with high-efficiency ammonia-nitrogen removal (up to 96% under aerobic conditions) after ten months, although a significant increase in nitrate concentration was recorded. Similarly, the finding from the second phase of this study showed a 75% removal of ammonia-nitrogen with a nitrate-nitrogen concentration of 2.7 mg/L. Furthermore, EIFAS showed a successful removal of orthophosphate and chemical oxygen demand (COD), by 93% and 98% respectively.
This study used a novel EIFAS designed system for a successful wastewater treatment containing high concentrations of ammonia in a single tank. The technology follows sustainable development principles by decreasing footprint and energy consumption. It can be used in small and medium-sized wastewater treatment plants, upgrading existing facilities in order to prevent eutrophication of receptors.