Biological Nutrient Removal (BNR) is a biological treatment process that is commonly used to remove nutrients, i.e., nitrogen and phosphorus, from wastewater so that a consequence of nutrient discharges; for example, eutrophication, can be eliminated. Under the requirements that nutrients must be removed, the BNR is potentially more economical and environmental friendly than the conventional activated sludge process equipped with chemical or physicochemical processes. In addition, the energy can be partially conserved in the BNR systems by denitrification in the anoxic zone of biological nitrogen removal process and by anaerobic stabilization in the anaerobic zone of biological phosphorus removal process. Additional BNR benefits include partial recovery of alkalinity by denitrification reaction and less waste sludge production by anoxic respiration; thereby, expenses for chemical and sludge disposal are reduced. Our previous project was listed below:

1. Biodegradation of acrylamide in biological wastewater treatment processes. Faculty of Engineering, Burapha University, 2010.