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

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 mm, 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.

Suarez, CarolinaGothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,University of Gothenburg(Swepub:gu)xsuama (author)
Li, ChunyanKarlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT),Karlsruhe Institute of Technology (author)
Christensson, MagnusHydrotech Veolia Water Solutions and Technologies AB(Swepub:lu)extLU-1517 (author)
Persson, Frank,1970Chalmers University of Technology(Swepub:cth)frankp (author)
Wagner, MichaelKarlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT),Karlsruhe Institute of Technology (author)
Hermansson, Malte,1954Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology,University of Gothenburg(Swepub:gu)xhemal (author)
Jönsson, KarinLund University,Lunds universitet,Vattenförsörjnings- och avloppsteknik,Avdelningen för kemiteknik,Institutionen för processteknik och tillämpad biovetenskap,Institutioner vid LTH,Lunds Tekniska Högskola,Water and Environmental Engineering,Division of Chemical Engineering,Department of Process and Life Science Engineering,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)vat-kjo (author)
Welander, ThomasHydrotech Veolia Water Solutions and Technologies AB (author)
Hydrotech Veolia Water Solutions and Technologies ABInstitutionen för kemi och molekylärbiologi (creator_code:org_t)

By the author/editor: Piculell, Maria; Suarez, Carolina; Li, Chunyan; Christensson, Ma ...; Persson, Frank, ...; Wagner, Michael; show more...; Hermansson, Malt ...; Jönsson, Karin; Welander, Thomas; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Environmental Bi ...; and Water Treatment

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Microbiology

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...; and Water Engineerin ...

By the university: University of Gothenburg; Chalmers University of Technology; Lund University

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