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• W1968526512 abstract "Fluidized-bed biofilm nitritation and denitritation reactors (FBBNR and FBBDR) were operated to eliminate the high concentrations of nitrogen by nitritation and denitritation process. The dissolved oxygen (DO) concentration was varied from 1.5 to 2.5 g/m3 at the top of the reactor throughout the experiment. NH4-N conversion and NO2-N accumulation in the nitritation reactor effluent was over 90 and 65%, respectively. The average NH4-N removal efficiency was 99.2 and 90.1% at the NLR of 0.9 and 1.2 kg NH4-N/m3 day, respectively. Increasing the NLR from 1.1 to 1.2 kg NH4-N/m3 day decreased the NH4-N elimination approximately two-fold while NH4-N conversion to NO2-N differences were negligible. The NO2-N/NOx-N ratios corresponded to 0.74, 0.73, 0.72, and 0.69, respectively, indicating the occurrence of partial nitrification. An average free ammonia concentration in the FBBNR was high enough to inhibit nitrite oxidizers selectively, and it seems to be a determining factor for NO2-N accumulation in the process. In the FBBDR, the NOx-N (NO2-N + NO3-N) concentrations supplied were between 227 and 330 mg N/l (NLR was between 0.08 and 0.4 kg/m3 day) and the influent flow was increased as long as the total nitrogen removal was close to 90%. The NO2-N and NO3-N concentrations in the effluent were 3.0 and 0.9 mg/l at 0.08 kg/m3 day loading rate. About 98% removal of NOx-N was achieved at the lowest NLR in the FBBDR. The FBBDR exhibited high nitrogen removal up to the NLR of 0.25 kg/m3 day. The NOx-N effluent concentration never exceeded 15 mg/l. The total nitrogen removal efficiency in the FBBRs was higher than 93% at 21 ± 1 °C." @default.
• W1968526512 created "2016-06-24" @default.
• W1968526512 creator A5015658124 @default.
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• W1968526512 date "2008-08-01" @default.
• W1968526512 modified "2023-10-03" @default.
• W1968526512 title "Nitritation and denitritation of ammonium-rich wastewater using fluidized-bed biofilm reactors" @default.
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• W1968526512 doi "https://doi.org/10.1016/j.jhazmat.2007.11.112" @default.
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