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Longevity and effectiveness of aluminum addition to reduce sediment phosphorus release and restore lake water quality
Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Box 7050, S-75007 Uppsala, Sweden..ORCID iD: 0000-0002-2804-326X
Univ Southern Denmark, Dept Biol, Campusvej 55, DK-5230 Odense M, Denmark..
ERD Environm Res & Design, 3419 Trentwood Blvd,Suite 102, Orlando, FL USA..
Leibniz Inst Freshwater Ecol & Inland Fisheries, Berlin, Germany..
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2016 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 97, 122-132 p.Article in journal (Refereed) PublishedText
Abstract [en]

114 lakes treated with aluminum (Al) salts to reduce internal phosphorus (P) loading were analyzed to identify factors driving longevity of post-treatment water quality improvements. Lakes varied greatly in morphology, applied Al dose, and other factors that may have affected overall treatment effectiveness. Treatment longevity based on declines in epilimnetic total P (TP) concentration averaged 11 years for all lakes (range of 0-45 years). When longevity estimates were used for lakes with improved conditions through the end of measurements, average longevity increased to 15 years. Significant differences in treatment longevity between deeper, stratified lakes (mean 21 years) and shallow, polymictic lakes (mean 5.7 years) were detected, indicating factors related to lake morphology are important for treatment success. A decision tree developed using a partition model suggested Al dose, Osgood index (01, a morphological index), and watershed to lake area ratio (related to hydraulic residence time, WA:LA) were the most important variables determining treatment longevity. Multiple linear regression showed that Al dose, WA:LA, and 01 explained 47, 32 and 3% respectively of the variation in treatment longevity. Other variables (too data limited to include in the analysis) also appeared to be of importance, including sediment P content to Al dose ratios and the presence of benthic feeding fish in shallow, polymictic lakes.

Place, publisher, year, edition, pages
2016. Vol. 97, 122-132 p.
Keyword [en]
Aluminum, Water management, Nutrients, Trophic status, Alum
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-298839DOI: 10.1016/j.watres.2015.06.051ISI: 000376786100013PubMedID: 26250754OAI: oai:DiVA.org:uu-298839DiVA: diva2:948363
Funder
Swedish Research Council Formas, 2012-1413
Available from: 2016-07-11 Created: 2016-07-11 Last updated: 2016-07-11Bibliographically approved

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