The effects of Bacillus subtilis on nitrogen recycling from aquaculture solid waste using heterotrophic nitrogen assimilation in sequencing batch reactors

► Bio-floc technology could remove C and N from aquaculture solid waste. ► Removal rates of C and N were higher in reactors with Bacillus subtilis. ► Inoculating with B. subtilis could inhibite autotrophic nitrification. ► Crude protein and EPS contents were higher in reactors with B. subtilis.