Design Model Parameter Analysis for Nitrifying Trickling Filters.

  Nitrifying trickling filters (NTFs) represent an effective technology for water resource recovery facilities (WRRFs) to achieve compliance with ammonia-N permits. However, while the potential benefits of NTFs are many, the design methods and associated parameter databases are underdeveloped. Research herein focused on analysis of pilot-scale NTF data to develop enhanced design guidance. rn(max,0) values ranged from 1.19-3.38 gN m-2*d-1, and correlated with influent ammonia-N concentration and loading. The transition concentration from rn(max,0) ranged from 0.9-22.2 mgN/L, and correlated with ammonia-N loading. Zero-order nitrification ranging from 0.24-1.58 gN m-2*d-1 was observed down-gradient of rn(max,0). First-order nitrification was not observed, nor was there a strong exponential correlation for decreasing nitrification rate. To translate results to NTF media different from that utilized, a relationship between the NTF media effectiveness parameter, E, and rn(max,0) was established. Collectively, the data presented enhances the engineer's ability to model and design NTFs.