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A 25-year retrospective analysis of factors influencing success of aluminum treatment for lake restoration

Agstam, Oskar and Lannergård, Emma and Rydin, E. and Futter, Martyn and Huser, Brian (2021). A 25-year retrospective analysis of factors influencing success of aluminum treatment for lake restoration. Water Research. 200 , 117267
[Research article]

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Abstract

For more than 50 years, aluminum (Al)-salts have been used with varying degrees of success to inactivate excess mobile phosphorus (P) in lake sediments and restore lake water quality. Here, we analyzed the factors influencing effectiveness and longevity of Al-treatments performed in six Swedish lakes over the past 25 years. Trends in post-treatment measurements of total phosphorus (TP), Chlorophyll a (Chl_a), Secchi disk depth (SD) and internal P loading rates (Li) were analyzed and compared to pre-treatment conditions. All measured water quality parameters improved significantly during at least the first 4 years post-treatment and determination of direct effects of Al-treatment on sediment P release (Li) was possible for three lakes. Improvements in TP (-29 to-80%), Chl_a (-50 to-78%), SD (7 to 121%) and Li (-68 to-94%) were observed. Treatment longevity, determined via decreases in surface water TP after treatment, varied from 7 to > 47 years. Lake type, Al dose, and relative watershed area were related to longevity. In addition, greater binding efficiency between Al and P was positively related to treatment longevity, which has not previously been shown. Our findings also demonstrate that adequate, long-term monitoring programs, including proper determination of external loads, are crucial to document the effect of Al-treatment on sediment P release and lake water quality. (c) 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

Authors/Creators:Agstam, Oskar and Lannergård, Emma and Rydin, E. and Futter, Martyn and Huser, Brian
Title:A 25-year retrospective analysis of factors influencing success of aluminum treatment for lake restoration
Series Name/Journal:Water Research
Year of publishing :2021
Volume:200
Article number:117267
Number of Pages:11
ISSN:0043-1354
Language:English
Publication Type:Research 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, Aluminum treatment, Phosphorus, Internal loading, Sediment, Legacy phosphorus
URN:NBN:urn:nbn:se:slu:epsilon-p-112877
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112877
Additional ID:
Type of IDID
DOI10.1016/j.watres.2021.117267
Web of Science (WoS)000664769100015
ID Code:24899
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:16 Aug 2021 08:25
Metadata Last Modified:16 Aug 2021 08:31

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