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Title: Nitrate removal by an ultra-compact biofilm reactor
Authors: Ong, S.L. 
Ng, W.J. 
Lee, L.Y. 
Yu, J.
Hu, J.Y. 
Keywords: Biofilm
Nitrate-N conversion rate
pH effect
Issue Date: 2000
Citation: Ong, S.L.,Ng, W.J.,Lee, L.Y.,Yu, J.,Hu, J.Y. (2000). Nitrate removal by an ultra-compact biofilm reactor. Water Science and Technology 42 (3-4) : 181-186. ScholarBank@NUS Repository.
Abstract: This study consisted of two stages. The first stage was to cultivate denitrifying biofilm with a simplified UCBR while the second stage was to investigate the performance of a standard UCBR for nitrate removal. The volumetric nitrate-N conversion rate increased steadily from less than 0.5 kg/m3.d to about 2.5 kg/m3.d towards the end of Stage 1. Reactor instability and poor biofilm morphology had led to a relatively low nitrate-N conversion rate during stage 1 of operation. In Stage 2, the conversion rate increased rapidly to 6.5 kg/m3.d within 4 days and increased steadily to 10.5 kg/m3.d, thereafter. The biofilm formation in Stage 2 was better than that attained in Stage 1. Biofilm density and biomass concentration in the reactor were in the range of 20.5 to 29.0 g/L and 1 to 3 g/L, respectively. The specific growth rate of the denitrifiers (μ) and the observed biomass growth yield coefficient (Y(obs)) in the reactor varied within the ranges of 1.5-4.2 d-1 and 0.20-0.65 g biomass/g nitrate-N, respectively. The specific nitrate-N conversion rate (γ) was within the range of 1.8-3.8 g nitrate-N/g biomass.d.
Source Title: Water Science and Technology
ISSN: 02731223
Appears in Collections:Staff Publications

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