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Optimization of aluminum treatment efficiency to control internal phosphorus loading in eutrophic lakes

Agstam-Norlin, Oskar and Lannergård, Emma and Futter, Martyn and Huser, Brian (2020). Optimization of aluminum treatment efficiency to control internal phosphorus loading in eutrophic lakes. Water Research. 185 , 116150
[Journal article]

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Abstract

Historical accumulation of phosphorus (P) in lake sediment often contributes to and sustains eutrophic conditions in lakes, even when external sources of P are reduced. The most cost-effective and commonly used method to restore the balance between P and P-binding metals in the sediment is aluminum (Al) treatment. The binding efficiency of Al, however, has varied greatly among treatments conducted over the past five decades, resulting in substantial differences in the amount of P bound per unit Al. We analyzed sediment from seven previously Al treated Swedish lakes to investigate factors controlling binding efficiency. In contrast to earlier work, lake morphology was negatively correlated to binding efficiency, meaning that binding efficiency was higher in lakes with steeply sloping bathymetry than in lakes with more gradually sloping bottoms. This was likely due to Al generally being added directly into the sediment, and not to the water column. Higher binding efficiencies were detected when Al was applied directly into the sediment, whereas the lowest binding efficiency was detected where Al was instead added to the water column. Al dose, mobile sediment P and lake morphology together explained 87% of the variation in binding efficiency among lakes where Al was added directly into the sediment. This led to the development of a model able to predict the optimal Al dose to maximize binding efficiency based on mobile sediment P mass and lake morphology. The predictive model can be used to evaluate cost-effectiveness and potential outcomes when planning Al-treatment using direct sediment application to restore water quality in eutrophic lakes.

Authors/Creators:Agstam-Norlin, Oskar and Lannergård, Emma and Futter, Martyn and Huser, Brian
Title:Optimization of aluminum treatment efficiency to control internal phosphorus loading in eutrophic lakes
Year of publishing :2020
Volume:185
Article number:116150
Number of Pages:7
Publisher:Elsevier {BV}
ISSN:0043-1354
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
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:lake restoration, aluminium treatment, sediment injection, phosphorus, internal loading
URN:NBN:urn:nbn:se:slu:epsilon-p-108874
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108874
Additional ID:
Type of IDID
DOI10.1016/j.watres.2020.116150
ID Code:18818
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:27 Nov 2020 10:23
Metadata Last Modified:15 Jan 2021 19:16

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