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E-FAS, vol. 14, no. 4, pp.363-369, 2011

DOI: http://dx.doi.org/10.5657/FAS.2011.0363

Comparison of the Nitrification Efficiencies of Three Biofilter Media in a Freshwater System

Dicky Harwanto1,2, Sung-Yong Oh3 and Jae-Yoon Jo1,4*

Affiliation: 1Department of Fisheries Biology, Pukyong National University, Busan 608-737, Korea 2Department of Fisheries and Marine Science, Diponegoro University, Semarang 50275, Indonesia 3Marine Biology and Living Resources Research Department, Korea Ocean Research and Development Institute, Seoul 425-600, Korea 4Tianjin Agricultural University, No. 22, Jinjing Road, Xiqing District Tianjin, 300384, P.R. China

Abstract: Total ammonia nitrogen (TAN) removal efficiencies of a sand filter (SF), polystyrene microbead filter (PF), and Kaldnes bead filter (KF) media were evaluated under ammonia loading rates of 5, 25, and 50 g m-3 day-1. The volume of each filter media tested was 7 L, and the water flow rate for all filter media was 24 L/min. The specific surface areas of the SF, PF, and KF were 7,836, 3,287, and 500 m2/m3, respectively. Sand was fluidized and the other two media were trickle filtered. The volumetric TAN removal rate increased with increasing ammonia loading rate for all filter media. Mean volumetric TAN removal rates under the ammonia loading rates of 5, 25, and 50 g m-3 day-1 in SF (39.3, 168.6, and 322.7 g m-3 day-1, respectively) were higher than those in PF (35.0, 157.4, and 310.5 g m-3 day-1, respectively) and KF (32.1, 142.5, and 288.1 g m-3 day-1, respectively). These results were related to differences in the specific surface areas of the filter media. PF was the most economic media for efficiently removing TAN.

Keyword: Recirculation system, Biofilter media, Nitrification, Freshwater, Ammonia removal