Ammonia Removal Performance of a Submerged Filter and a Rotating Biological Contactor Using an Interlocked Fiber Medium

Abstract

Ammonia removal was studied using a submerged filter and a rotating bioｌogical contactor (RBｌC) with an interlocked fiber medium. Experiments were carried out to examine the effect of flow rate on the ammonia removal rate with a submerged filter and the effects of physical parameters (flow rate, submersion ratio, and rotational velocity) on the ammonia removal rate in an RBC. In the submerged filter, the ammonia removal rate increased in proportion to the hydraulic loading rate in the range of 80-640 m³/m²/day. In the RBC, the ammonia removal rate was high at rotational velocity range of 12-18rpm (peripheral velocity, 0.094-0.14m/s) and at a submersion ratio of 40% or more. Conceming flow rates, while an increase was observed with increasing flow rates, the actual differences were minimal as compared with the submerged filter. When the influent ammonianitrogen concentration was fixed at lmg-N/L, the ammonia removal rate was higher in the submerged filter, peaking at 0.25g-N/m²/day (flow rate, 240L/h), While the RBC's maximum was 0.15g-N/m²/day (rotational velocity, 12rpm ; aubmersion ratio, 50% ; flow rate, 120L/h).