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Restoration of Nutrient Rich Lakes - Towards Better Understanding of Sediment Phosphorus Availability and Management

Agstam-Norlin, Oskar (2022). Restoration of Nutrient Rich Lakes - Towards Better Understanding of Sediment Phosphorus Availability and Management. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-879-0
eISBN 978-91-7760-880-6
[Doctoral thesis]

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Abstract

Lakes are important for many reasons as they provide valuable ecological and human services, such as drinking water and recreational use. Eutrophication, a result of excess nutrients (e.g. phosphorus (P)) in lakes, is a threat to these resources, causing impairment of water quality. Excess P loading to lakes accumulates in the sediment, consequently making sediment a potential source of P via release (internal loading). One way of counteracting effects caused by internal loading is to inactivate the pool of potentially available P in the sediment. Better information is needed for optimizing most in-lake P reduction methods, including aluminum (Al)-treatment. One of these areas is better knowledge about the availability of different P fractions, and which fractions to target with a specific dose of Al under certain environmental conditions such as bioturbation (e.g. sediment mixing by carp). We also need to deepen the knowledge about modern Altreatment methods, with respect to both treatment techniques and dosing. Knowledge about factors affecting how long the positive effects from an Al-treatment last also needs to be improved. This thesis presents results concerning optimization of Al application methods, where a novel application method that injects Al into the sediment was evaluated and a model for optimal Al dose determination is presented. Factors affecting treatment longevity were evaluated, using historical water quality records and knowledge about a previously assumed recalcitrant P form being bioavailable due to bioturbation by benthic feeding fish like carp and bream. Al-treatment methods, including practical Al application methods as well as dosing methods are developing rapidly and being applied in the field, and further work is needed to keep up with evaluating the progress of lake restoration results using methods like Al-treatment.

Authors/Creators:Agstam-Norlin, Oskar
Title:Restoration of Nutrient Rich Lakes - Towards Better Understanding of Sediment Phosphorus Availability and Management
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2022
Number:2022:2
Number of Pages:66
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-879-0
ISBN for electronic version:978-91-7760-880-6
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
Keywords:phosphorus (P), internal P loading, sediment, legacy P, eutrophication, lake restoration, aluminum (Al)-treatment
URN:NBN:urn:nbn:se:slu:epsilon-p-115138
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-115138
ID Code:26660
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:05 Jan 2022 12:25
Metadata Last Modified:05 Jan 2022 12:31

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