Journal
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
Volume 68, Issue 5, Pages 842-856Publisher
CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
DOI: 10.1139/F2011-016
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- Centre for Lake Restoration (CLEAR, Denmark)
- EU
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Loading, retention, and in-lake cycling of phosphorus (P), nitrogen, silica, and dissolved organic carbon (DOC) were studied 1 year before and 3 years after P-inactivation by aluminum (Al) hydroxide in Danish Lake Nordborg in 2006. Simultaneously, external P loading was reduced by 40% via establishment of precipitation ponds in two inlets. After Al treatment, the internal P loading (sediment P release) during summer declined 90%-94%, owing to adsorption to aluminum hydroxide. Also, silicate regeneration from the sediment was reduced by 69%-76%, and sediment oxygen uptake as well as ammonium release declined markedly. Consequently, lake water total P, dissolved inorganic P, silicate, and DOC decreased by 73%, 97%, 87%, and 46%, respectively. The Secchi depth increased in the summer period during the first post-treatment year, but declined afterwards to pre-treatment levels, even though the mean lake-water total P concentration during summer was reduced from similar to 240 mu g.L(-1) before treatment to 26-65 mu g.L(-1) in the first three post-treatment years. We conclude that a further reduction in external P loading is needed to obtain the full effect of the Al treatment in Lake Nordborg.
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