Cold-climate nitrification on plastic media trickling filters

Effect of operating variables on nitrification rates in trickling filters

“…Experiments with nitrification on crossflow media were also conducted at Ames, Iowa (Gullicks, 1987;Gullicks and Cleasby, 1990a;990b; Gullicks and Cleasby, 1993).This study involved two stages of tertiary filtration treating a secondary effluent with SS values of 40 to 80 mgJL. The first filter was packed with crossflow media with a specific surface of 98 m 2 fm 3 ; the second filter had more dense crossflow media with a specific surface of 138 m 2 fm 3 • Intermediate clarification was provided.…”

Nitrification performance and potential at the Ames Water Pollution Control Facility

“…Logan's control volumes for analysis of the transport equation over a differential element in the biofilm in a trickling filter (Logan, 1999) ............ 24 Figure 6. Nitrogen flow diagram for nitrification process (Riefler et al, 1998) (Gullicks, 1987) that aided in the design of the facility's nitrifying trickling filters.…”

“…Finally, the second stage, nitrifying trickling filters (NTF) were designed to polish the wastewater and remove ammonia. The A WPCF was designed with the aid of empirical design curves developed by Harvey Gullicks as part of his doctoral studies under Dr. Jack Cleasby at Iowa State University (Gullicks, 1987). Gullicks theorized that four critical operational variables affect the performance of trickling filters.…”

“…The specific ammonia removal rate is found by intersecting the influent ammonia concentration and hydraulic loading on the design curves. (Gullicks, 1987).…”

“…Closer examination of the operating data was used to reveal the accuracy of Gullicks' (1987) design curves, to show the effect of CBOD on ammonia removal in the TFs, and to adjust ammonia removal data to a 10°C basis.…”