High rate nitrifying trickling filters

Abstract

A two year pilot plant study has been performed in order to evaluate a nitrifying trickling filter (NTF) process within an upgrading project for increased nutrient removal. The operation of the filters was very stable without upsets due to predators. The filter microfauna was dominated by worms and the presence of filter fly larvae was limited. Suggested predator control methods like flooding or varying the flushing intensity did not affect the identified microfauna. By operating the filters in a two stage alternating series filtration mode, higher nitrification rates and lower effluent ammonia concentrations could be reached simultaneously in comparison to operating the filters in a single stage filtration mode.

Experiences from MBBR Post-Denitrification Process in Long-term Operation at two WWTPs

“…In the nineties, the two municipal wastewater treatment plants (WWTPs) Sjölunda and Klagshamn in Malmö, Sweden, were upgraded for extended nitrogen removal. After several years (1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995) of pilot studies in biofilm applications for nitrogen removal (Andersson et al, 1994;Aspegren et al, 1998) MBBR processes for post-denitrification were established at both plants. The MBBR at Klagshamn was among the first of its kind when it was taken into operation in 1997 and the MBBR at Sjölunda WWTP was taken into operation two years later.…”

Of: Symbolic Regression of Upstream, Stormwater, and Tributary E. Coli Concentrations Using River Flows, Jagupilla, S. C. K.; Vaccari, D. A.; Miskewitz, R.; Su, T.‐L.; Hires, R. I. (2015), 87, 26‐34; correction 87, 576.

“…As a consequence of the differing geometries, the gross hydraulic loading rate (HLR) was approximately 50% less in our study; however, the specific HLRs were comparable as were the NH3 loading rates. Andersson et al (1994) evaluated a pilot NTF (two units, each with an area:height of 1.58) over a two year period treating secondary effluent from an activated sludge WRRF; assessments were made both with a single NTF and with two operated in series. Comparatively, all tests were operated at a very low sHLR relative to the pilot-scale system evaluated herein, but their NH3 loading rate was higher.…”

“…While quality empirical data sets from pilot and/or full scale operations are available (e.g. Andersson et al, 1994;Boiler and Gujer, 1986;Goldstein and Smith, 2002;Gullicks and Cleasby, 1986;Mofokeng et al, 2009;Parker et al, 1995;Parker et al, 1989;Parker et al, 1997), of the extensive data sets that were reviewed, only those published by Parker and coworkers include detailed kinetic data within the NTF. The value and importance of such kinetic data within the depths of an NTF relates to the ability to refine and optimize the empirical-based design of full-scale NTFs for site-specific conditions; the NTF design models all integrate and require zero-and first-order NH3 : emoval kinetic parameters.…”

Bat for fiskeopdræt i norden

“…Rislefiltrene har de seneste 20 år fået en renaessance som følge af udviklingen af nye baeremedier og bedre forståelse for driftsforholdene og kinetikken (Andersson, 1994) (Eding, 2006). Rislefilter er en aerob proces, hvor beluftningen opstår ved den risling, der foregår gennem filtermediet.…”