Design Model Parameter Analysis for Nitrifying Trickling Filters

Abstract

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. r n (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 r n(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 r n (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 r n (max,0) was established. Collectively, the data presented enhances the engineer's ability to model and design NTFs.