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      Low-dose alum application trialled as a management tool for internal nutrient loads in Lake Okaro, New Zealand

      Paul, Wendy J.; Hamilton, David P.; Gibbs, Max M.
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      Hamilton 2008 Low-dose alum.pdf
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      DOI
       10.1080/00288330809509949
      Link
       www.royalsociety.org.nz
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      Gibbs, M. M., Hamilton, D. P. & Paul, W. J. (2008). Low-dose alum application trialled as a management tool for internal nutrient loads in Lake Okaro, New Zealand. New Zealand Journal of Marine and Freshwater Research, 42, 207- 217.
      Permanent Research Commons link: https://hdl.handle.net/10289/2725
      Abstract
      Aluminium sulfate (alum) was applied to Lake Okaro, a eutrophic New Zealand lake with recurrent cyanobacterial blooms, to evaluate its suitability for reducing trophic status and bloom frequency. The dose yielded 0.6 g aluminium m–3 in the epilimnion. Before dosing, pH exceeded 8 in epilimnetic waters but was optimal for flocculation (6–8) below 4 m depth. After dosing, there was no significant change in water clarity, hypolimnetic pH decreased to 5.5, and soluble aluminium exceeded recommended guidelines for protection of freshwater organisms. Epilimnetic phosphate concentrations decreased from 40 to 5 mg m–3 and total nitrogen (TN):total phosphorus (TP) mass ratios increased from 7:1 to 37:1. The dominant phytoplankton species changed from Anabaena spp. before dosing, to Ceratium hirudinella , then Staurastrum sp. after dosing. Detection of effectiveness of dosing may have been limited by sampling duration and design, as well as the low alum dose. The decrease in hypolimnetic pH and epilimnetic TP, and increase in Al3+ and chlorophyll a, are attributed to the low alkalinity lake water and coincidence of alum dosing with a cyanobacterial bloom and high pH.
      Date
      2008
      Type
      Journal Article
      Publisher
      RSNZ Publishing
      Rights
      This article has been published in the New Zealand Journal of Marine and Freshwater Research. © The Royal Society of New Zealand 2008.
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      • Science and Engineering Papers [3124]
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