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Microbial communities and nitrogen cycling functions in barrier systems for treatment of nitrogen polluted water

Hellman, Maria (2022). Microbial communities and nitrogen cycling functions in barrier systems for treatment of nitrogen polluted water. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760- 967-4
eISBN 978-91-7760- 968-1
[Doctoral thesis]

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Water is an increasingly threatened resource. Anthropogenic input of nitrogen (N) to surface waters causes eutrophication, and N in the groundwater can be a threat to human health, hence management measures are needed. The aim of this thesis was to evaluate two types of systems for remediating N-polluted water using permeable reactive barriers by determining N removal efficiency, possible adverse effects, and the role of the microorganisms in the systems. Four projects evaluated denitrifying barriers, DBRs, for treatment of nitratepolluted water originating from the use of explosives in mining industry. Woodchip DBRs were found to be suitable for remediation of this type of water. Initial leakage of nitrite, ammonium and organic carbon was observed, the emission of nitrous oxide was small. Another study used barriers based on compost or woodchips in combination with aquifer recharge to replenish groundwater using ammonium-rich treated wastewater. One out of four barriers significantly removed ammonium from the wastewater, and instead nitrate was produced. All compost-based barriers released organic carbon, replacing one pollutant with another. The carbonaceous material in the permeable reactive barriers determined the composition of the microbial communities in the barriers; significantly different microbiomes developed depending on substrate type. Besides microorganisms capable of a range of N-transforming reactions, all barriers harboured groups of bacteria known for degrading macromolecules like cellulose. There were temporal and spatial patterns in the distribution the microorganisms, and the abundances of specific bacterial groups correlated to the chemistry in the water. Future studies should focus on how different types of carbon affect the Ntransforming processes, to maximise N-removal and minimise adverse effects.

Authors/Creators:Hellman, Maria
Title:Microbial communities and nitrogen cycling functions in barrier systems for treatment of nitrogen polluted water
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2022
Number of Pages:81
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760- 967-4
ISBN for electronic version:978-91-7760- 968-1
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
Keywords:permeable reactive barrier, denitrifying bioreactor, woodchips, denitrification, DNRA, microbial community, N transformation processes, passive wastewater treatment, functional gene abundance, nitrous oxide
Permanent URL:
ID Code:28497
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: SLUpub Connector
Deposited On:19 Aug 2022 13:52
Metadata Last Modified:02 Sep 2022 23:32

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