Cold shocks of Anammox biofilm stimulate nitrogen removal at low temperatures

The adaptation of Anammox (ANaerobic AMMonium OXidation) to low temperatures (10–15°C) is crucial for sustaining energy‐efficient nitrogen removal from the mainstream of municipal wastewater. But, current adaptation methods take months or even years. To speed up the adaption of Anammox to low temper...

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Bibliographic Details
Published in:Biotechnology progress 2018-01, Vol.34 (1), p.277-281
Main Authors: Kouba, V., Darmal, R., Vejmelkova, D., Jenicek, P., Bartacek, J.
Format: Article
Language:English
Subjects:
Adaptation
adaptation to low temperatures
Ammonium
Ammonium Compounds - chemistry
Anaerobiosis - genetics
Bacteria - genetics
Bacteria - growth & development
Bacteria - metabolism
Biofilms
Biofilms - growth & development
Bioreactors
Cold
Cold shock
cold shocks
Cold Temperature
Cold-Shock Response - genetics
Denitrification - genetics
Dominant species
Fluorescence
Fluorescence in situ hybridization
Hybridization analysis
In Situ Hybridization, Fluorescence
Low temperature
main stream Anammox
Microorganisms
Municipal wastewater
Nitrogen - metabolism
Nitrogen removal
Oxidation
Oxidation-Reduction
Reduction
Temperature effects
Waste Disposal, Fluid - methods
Wastewater
Wastewater treatment
Water Purification - methods
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Summary:The adaptation of Anammox (ANaerobic AMMonium OXidation) to low temperatures (10–15°C) is crucial for sustaining energy‐efficient nitrogen removal from the mainstream of municipal wastewater. But, current adaptation methods take months or even years. To speed up the adaption of Anammox to low temperatures, this study describes a new approach: exposing Anammox microorganisms to an abrupt temporary reduction of temperature, i.e., cold shock. Anammox biomass in a moving bed biofilm reactor was subjected to three consecutive cold shocks (reduction from 24 ± 2 to 5.0 ± 0.2°C), each taking eight hours. Before the cold shocks, Anammox activity determined in ex situ tests using the temperature range of 12.5–19.5°C was 0.005–0.015 kg‐N kg‐VSS−1 day−1. Cold shocks increased the activity of Anammox at 10°C to 0.054 kg‐N kg‐VSS−1 day−1 after the third shock, which is similar to the highest activities obtained for cold‐enriched or adapted Anammox reported in the literature (0.080 kg‐N kg‐VSS−1 day−1). Fluorescence in situ hybridization analysis showed that Ca. Brocadia fulgida was the dominant species. Thus, cold shocks are an intriguing new strategy for the adaptation of Anammox to low temperature. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 34:277–281, 2018
ISSN:8756-7938
1520-6033
DOI:10.1002/btpr.2570