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The inhibitory effects of reject water on nitrifying populations grown at different biofilm thickness

Piculell, Maria LU ; Suarez, Carolina; Li, Chunyan; Christensson, Magnus LU ; Persson, Frank; Wagner, Michael; Hermansson, Malte; Jönsson, Karin LU and Welander, Thomas (2016) In Water Research 104. p.292-302
Abstract

Suppression of nitrite oxidizing bacteria (NOB) is of vital importance to achieve successful, energy efficient, mainstream anammox processes for wastewater treatment. In this study, biofilm carriers from a fully nitrifying MBBR system, fed with mainstream wastewater, were temporarily exposed to reject water from sludge dewatering, to evaluate this as a possible strategy to inhibit NOB and achieve nitrite production under realistic conditions. Two different carrier types were compared, in which biofilm thickness was maintained at approximately 400 and 50 μm, respectively, and reject treatment was tested at different exposure time and loading rates. Reject exposure almost always resulted in an increased nitrite production in the thinner... (More)

Suppression of nitrite oxidizing bacteria (NOB) is of vital importance to achieve successful, energy efficient, mainstream anammox processes for wastewater treatment. In this study, biofilm carriers from a fully nitrifying MBBR system, fed with mainstream wastewater, were temporarily exposed to reject water from sludge dewatering, to evaluate this as a possible strategy to inhibit NOB and achieve nitrite production under realistic conditions. Two different carrier types were compared, in which biofilm thickness was maintained at approximately 400 and 50 μm, respectively, and reject treatment was tested at different exposure time and loading rates. Reject exposure almost always resulted in an increased nitrite production in the thinner biofilm, and overall, nitrifiers growing in the thin biofilm were more sensitive than those grown in the thicker biofilm. The effect from reject exposure remained in the systems for four days after returning to mainstream operation, with nitrite production gradually increasing for three days. Increased concentrations of free ammonia correlated with reject exposure and may be the cause of inhibition, although other factors cannot be excluded.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Biofilm thickness, FISH-CLSM, MBBR, Nitritation-anammox, NOB inhibition, Optical coherence tomography
in
Water Research
volume
104
pages
11 pages
publisher
Elsevier
external identifiers
  • Scopus:84983082113
ISSN
0043-1354
DOI
10.1016/j.watres.2016.08.027
language
English
LU publication?
yes
id
77e4aa65-8275-4400-a9c9-60ec914e36e1
date added to LUP
2016-10-13 12:36:12
date last changed
2016-10-14 03:00:03
@misc{77e4aa65-8275-4400-a9c9-60ec914e36e1,
  abstract     = {<p>Suppression of nitrite oxidizing bacteria (NOB) is of vital importance to achieve successful, energy efficient, mainstream anammox processes for wastewater treatment. In this study, biofilm carriers from a fully nitrifying MBBR system, fed with mainstream wastewater, were temporarily exposed to reject water from sludge dewatering, to evaluate this as a possible strategy to inhibit NOB and achieve nitrite production under realistic conditions. Two different carrier types were compared, in which biofilm thickness was maintained at approximately 400 and 50 μm, respectively, and reject treatment was tested at different exposure time and loading rates. Reject exposure almost always resulted in an increased nitrite production in the thinner biofilm, and overall, nitrifiers growing in the thin biofilm were more sensitive than those grown in the thicker biofilm. The effect from reject exposure remained in the systems for four days after returning to mainstream operation, with nitrite production gradually increasing for three days. Increased concentrations of free ammonia correlated with reject exposure and may be the cause of inhibition, although other factors cannot be excluded.</p>},
  author       = {Piculell, Maria and Suarez, Carolina and Li, Chunyan and Christensson, Magnus and Persson, Frank and Wagner, Michael and Hermansson, Malte and Jönsson, Karin and Welander, Thomas},
  issn         = {0043-1354},
  keyword      = {Biofilm thickness,FISH-CLSM,MBBR,Nitritation-anammox,NOB inhibition,Optical coherence tomography},
  language     = {eng},
  month        = {11},
  pages        = {292--302},
  publisher    = {ARRAY(0x882c088)},
  series       = {Water Research},
  title        = {The inhibitory effects of reject water on nitrifying populations grown at different biofilm thickness},
  url          = {http://dx.doi.org/10.1016/j.watres.2016.08.027},
  volume       = {104},
  year         = {2016},
}