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Successful hydraulic strategies to start up OLAND sequencing batch reactors at lab scale

Thomas Schaubroeck UGent, Samik Bagchi, Haydée De Clippeleir UGent, Marta Carballa, Willy Verstraete UGent and Siegfried Vlaeminck UGent (2011) Microbial Resource Management in Biotechnology, 1st International symposium, Abstracts.
abstract
Oxygen-limited autotrophic nitrification/denitrification (OLAND) is a one-stage realization of partial nitritation/anammox, the economically preferred ammonium removal technology for wastewaters devoid in carbon. Yet, the slow and delicate start-up of OLAND remains an important challenge. In our research, effects of salinity, feeding regime and cyclical volumetric exchange ratio were examined to find optimal growth conditions in sequencing batch reactors (SBR). Four lab-scale reactors were started up with synthetic influent, cycles of 1 hour and attached-growth OLAND inoculum, in two sequential tests using two parallel SBR. In the first test, 3 g NaCl/L was added to the influent at 50% exchange ratio. All influent of SBR A was fed in the first 10% of the reaction phase, whereas the feed of SBR B was semi-continuously spread over the full reaction phase. Only SBR B could be successfully started up, achieving a stable nitrogen removal rate of 0.45 g N/L/d after 25 days at 82% nitrogen removal efficiency. In the second test, SBR C and D were fed semi-continuously over 75% of reaction phase at 25% exchange ratio. Salt was only added to the SBR D influent (5 g NaCl/L), and led to the gradual development of more small aggregates. Last-mentioned obtained a stable removal rate of 0.95 g N/L/d and 88% nitrogen removal efficiency after 29 days. SBR C removed ammonium at a stable rate of 0.55 g N/L/d and 92% nitrogen removal efficiency in a start-up time of 14 days. For all reactors, the ratio of anammox to nitritation was considerably higher in large (>250 µm) than in small aggregates (<250 µm). Overall, SBR B, C and D showed excellent performance in a short timeframe, supporting an initial presumption that stable physicochemical conditions in an OLAND reactor are beneficial for microbial growth, yet tested salinities did not play a key role.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
in
Microbial Resource Management in Biotechnology, 1st International symposium, Abstracts
conference name
1st International symposium on Microbial Resource Management in Biotechnology (MRM 2011) : Concepts and applications
conference location
Ghent, Belgium
conference start
2011-06-30
conference end
2011-07-01
language
English
UGent publication?
yes
classification
C3
id
2081672
handle
http://hdl.handle.net/1854/LU-2081672
date created
2012-04-05 18:45:09
date last changed
2012-04-11 13:27:12
@inproceedings{2081672,
  abstract     = {Oxygen-limited autotrophic nitrification/denitrification (OLAND) is a one-stage realization of partial nitritation/anammox, the economically preferred ammonium removal technology for wastewaters devoid in carbon. Yet, the slow and delicate start-up of OLAND remains an important challenge. In our research, effects of salinity, feeding regime and cyclical volumetric exchange ratio were examined to find optimal growth conditions in sequencing batch reactors (SBR). Four lab-scale reactors were started up with synthetic influent, cycles of 1 hour and attached-growth OLAND inoculum, in two sequential tests using two parallel SBR. In the first test, 3 g NaCl/L was added to the influent at 50\% exchange ratio. All influent of SBR A was fed in the first 10\% of the reaction phase, whereas the feed of SBR B was semi-continuously spread over the full reaction phase. Only SBR B could be successfully started up, achieving a stable nitrogen removal rate of 0.45 g N/L/d after 25 days at 82\% nitrogen removal efficiency. In the second test, SBR C and D were fed semi-continuously over 75\% of reaction phase at 25\% exchange ratio. Salt was only added to the SBR D influent (5 g NaCl/L), and led to the gradual development of more small aggregates. Last-mentioned obtained a stable removal rate of 0.95 g N/L/d and 88\% nitrogen removal efficiency after 29 days. SBR C removed ammonium at a stable rate of 0.55 g N/L/d and 92\% nitrogen removal efficiency in a start-up time of 14 days. For all reactors, the ratio of anammox to nitritation was considerably higher in large ({\textrangle}250 {\textmu}m) than in small aggregates ({\textlangle}250 {\textmu}m). Overall, SBR B, C and D showed excellent performance in a short timeframe, supporting an initial presumption that stable physicochemical conditions in an OLAND reactor are beneficial for microbial growth, yet tested salinities did not play a key role.},
  author       = {Schaubroeck, Thomas and Bagchi, Samik and De Clippeleir, Hayd{\'e}e and Carballa, Marta and Verstraete, Willy and Vlaeminck, Siegfried},
  booktitle    = {Microbial Resource Management in Biotechnology, 1st International symposium, Abstracts},
  language     = {eng},
  location     = {Ghent, Belgium},
  title        = {Successful hydraulic strategies to start up OLAND sequencing batch reactors at lab scale},
  year         = {2011},
}

Chicago
Schaubroeck, Thomas, Samik Bagchi, Haydée De Clippeleir, Marta Carballa, Willy Verstraete, and Siegfried Vlaeminck. 2011. “Successful Hydraulic Strategies to Start up OLAND Sequencing Batch Reactors at Lab Scale.” In Microbial Resource Management in Biotechnology, 1st International Symposium, Abstracts.
APA
Schaubroeck, T., Bagchi, S., De Clippeleir, H., Carballa, M., Verstraete, W., & Vlaeminck, S. (2011). Successful hydraulic strategies to start up OLAND sequencing batch reactors at lab scale. Microbial Resource Management in Biotechnology, 1st International symposium, Abstracts. Presented at the 1st International symposium on Microbial Resource Management in Biotechnology (MRM 2011) : Concepts and applications.
Vancouver
1.
Schaubroeck T, Bagchi S, De Clippeleir H, Carballa M, Verstraete W, Vlaeminck S. Successful hydraulic strategies to start up OLAND sequencing batch reactors at lab scale. Microbial Resource Management in Biotechnology, 1st International symposium, Abstracts. 2011.
MLA
Schaubroeck, Thomas, Samik Bagchi, Haydée De Clippeleir, et al. “Successful Hydraulic Strategies to Start up OLAND Sequencing Batch Reactors at Lab Scale.” Microbial Resource Management in Biotechnology, 1st International Symposium, Abstracts. 2011. Print.