Analysis of factors of water treatment with biofilm sequence batch reactor in recirculating aquaculture systems

BSBR (biofilm sequence batch reactor) is a treatment technology. It takes advantages of both activated sludge process and SBR. The paper was to analyze factors of BSBR treatment in recirculating aquaculture systems in terms of removal speed of TAN and TN. The pH and alkalinity has big influence on the nitration reaction, with better removal of TAN and TN under pH 6.3. Dissolved oxygen has also big influence on denitrification reaction. Considering the growth demand of aquatic organism, it is better to control the influent water dissolved oxygen to be 4.5~6.5 mgL-1 in the experimental installation. The water temperature is better maintained at about 20℃ so that a good denitrogenation effect can be guaranteed.