Effect of disc rotating velocity on the nitrification performance of RBC system and biofilm kinetics

摘要

Nitrification of high strength ammonia wastewaters in a rotating biological contactor (RBC) system was studied at 5 rpm, 15 rpm and 20 rpm disc rotating velocities. Effect of disc rotating velocities on the performance of the RBC stem and biofilm kinetics was observed. Flow rates were changed from 19.6 to 103.51 day~-1 giving hydraulic retention times of 0.28 to 1.5 days. Influent NH_4-N concentrations were changed from 100 to 550 mg 1~-1. For certain applied NH_4-N loading rates and bulk NH_4-N concentrations, rotating velocity of discs affected NH_4-N removal rate and biofilm kinetics in the RBC system.