Most suitable type of diffuser for SBR

Hello, dear fellows! I'm working in the design of an rectangular-shaped SBR for the treatment of psychiatric hospital wastewaters. What type of diffuser (tubular, disc...) could be more suitable for the system, regarding the following aspects: -2 tanks -Average flow = 81,6 m3/d -total V = ~ 51 m3/tank, 4 cycles per day per tank -Fill volume = 10,2 m3/fill -Calculated required O2 per tank: 2,36 kg O2/h per tank -dimensions (h x L x w) = 4 m x 7 m x 2 m -BOD, COD, TSS, TN, TP (as chosen design parameters) = 285, 507, 95, 25,4 and 5,5 mg/L respectively -BOD, COD, TSS, TN TP (expected at the effluent): 20, 50, 20, 1, 1 mg/L respectively Nitrification and denitrification processes are expected to be achieved.   Thank you very much.