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PhD Defence: Microbial ecology of denitrifying woodchip bioreactors, a step towards microbial management

During his PhD studies, Arnaud Jéglot researched the microbes responsible for denitrification in woodchip bioreactors at low temperature.

Photo: Arnaud Tristan Arjuna Jeglot
Picture of three woodchip bioreactors located at Hofmansgave, Denmark. In the forefront the sedimentation pond preceding the three woodchip filled tanks Photo: Arnaud Jéglot

These bioreactors are installed to remove nitrate from agricultural drainage water, but have low efficiency during the winter season. Therefore, it is paramount to enhance the nitrate removal when temperature is low to protect the natural aquatic ecosystems from receiving nitrogen-contaminated water.

The new research findings document the versatile microbial composition of woodchip bioreactors based on molecular analyses and contribute to the understanding of these ecosystems. Studies with enrichment and isolated cultures of cold-adapted denitrifying bacteria aimed at future implementation of microbial management to improve the drainage water treatment in woodchip bioreactors under low temperature conditions.

The PhD study was completed at the Department of Agroecology, Faculty of Technical Sciences, Aarhus University.

This summary was prepared by the PhD student.

Time: Tuesday 21 June 2022 at 12.00
Place: 8814 - 3075, Auditorium, Aarhus University, Blichers Allé 20, DK-8830 Tjele

The PhD defence will also be held online. To receive a link to the event, please send an e-mail to kch@agro.au.dk

Title of PhD thesis: Microbial ecology and management of denitrifying woodchip bioreactors for enhanced treatment of agricultural drainage water at low temperature

Contact information: Arnaud Jéglot, e-mail: arnaud.jeglot@agro.au.dk, tel.: +45 50117549

Members of the assessment committee:

Senior Researcher Jim Rasmussen (Chair). Department of Agroecology, Aarhus University, Denmark.

Professor Jens Aamand, Department of Environmental Biotechnology, GEUS, Denmark.

Research Officer Owen Fenton, Teagasc

Main supervisor:
Associate Professor Lars Elsgaard, Department of Agroecology, Aarhus University, Denmark.

Senior Researcher Finn Plauborg, Department of Agroecology, Aarhus University, Denmark.

Senior Science Manager Kirk Matthew Schnorr, Novozymes A/S, Denmark.

Science Manager Sebastian Reinhold Sørensen, Novozymes A/S, Denmark.

Language: The PhD dissertation will be defended in English

The defence is public.
The PhD thesis is available for reading at the Graduate School of Technical Sciences/GSTS, Katrinebjergvej 89F, building 5132, 8200 Aarhus N.