Nitritation and denitritation of ammonium-rich wastewater using fluidized-bed biofilm reactors

Journal of Hazardous Materials
Sukru Aslan, Mohamed Dahab

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/m(3) at the top of the reactor throughout the experiment. NH(4)-N conversion and NO(2)-N accumulation in the nitritation reactor effluent was over 90 and 65%, respectively. The average NH(4)-N removal efficiency was 99.2 and 90.1% at the NLR of 0.9 and 1.2 kg NH(4)-N/m(3)day, respectively. Increasing the NLR from 1.1 to 1.2 kg NH(4)-N/m(3)day decreased the NH(4)-N elimination approximately two-fold while NH(4)-N conversion to NO(2)-N differences were negligible. The NO(2)-N/NO(x)-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 NO(2)-N accumulation in the process. In the FBBDR, the NO(x)-N (NO(2)-N+NO(3)-N) concentrations supplied were between 227 and 330 mg N/l (NLR was between 0.08 and 0.4 kg/m(3)day) and the influent flow was increased as long as the total n...Continue Reading

References

Sep 6, 2001·Biotechnology and Bioengineering·J J BeunM C van Loosdrecht
Sep 8, 2004·Water Research·Fahid K J Rabah, Mohamed F Dahab
Oct 20, 2004·Water Research·Fahid K J Rabah, Mohamed F Dahab
Aug 8, 2006·Water Science and Technology : a Journal of the International Association on Water Pollution Research·L GutJ Bosander
Feb 3, 2007·Journal of Bioscience and Bioengineering·Taichi YamamotoKenji Furukawa
Jun 6, 2007·Water Science and Technology : a Journal of the International Association on Water Pollution Research·B SzatkowskaB Hultman

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Citations

Sep 20, 2011·Applied Biochemistry and Biotechnology·Sukru Aslan, Burhanettin Gurbuz
Jun 12, 2013·Bioresource Technology·Dorota Kulikowska, Katarzyna Bernat
Sep 16, 2017·Environmental Technology·Haolong WangGeorge Nakhla
Sep 14, 2019·Applied Microbiology and Biotechnology·Pedro Soares-CastroPedro M Santos
Jan 3, 2021·Bioprocess and Biosystems Engineering·Roumi Bhattacharya, Debabrata Mazumder

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