Alum treatment effectiveness and longevity in shallow lakes

Six shallow lakes in Washington State, U.S.A. (Wapato, Pattison, Long (Thurston), Erie, Campbell, Long (Kitsap)) lakes were treated with alum in the 1980s. The long-term responses of these lakes to a single alum treatment were studied. Treatment of Wapato lake was completely unsuccessful and total p...

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Veröffentlicht in:Hydrobiologia 1994-02, Vol.275-276 (1), p.423-431
Hauptverfasser: Welch, E B, Schrieve, G D
Format: Artikel
Sprache:eng
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Zusammenfassung:Six shallow lakes in Washington State, U.S.A. (Wapato, Pattison, Long (Thurston), Erie, Campbell, Long (Kitsap)) lakes were treated with alum in the 1980s. The long-term responses of these lakes to a single alum treatment were studied. Treatment of Wapato lake was completely unsuccessful and total phosphorus levels returned to pre-treatment levels within 1 month. Treatment of Pattison lake was effective for 4 years but was affected by the high coverage of macrophytes. Treatment of Long lake (Thurston) was effective for 5 years. Treatment of Erie and Campbell lakes and Long lake (Kitsap) remained effective after 6 years. The reduction in blue-green algae following alum treatment suggested that inhibition of the sediment-to-water migration of blue-green algae might be an important mechanism for the effect of alum in oxic shallow lakes. In anoxic stratified lakes the primary mechanism was complexation of phosphorus in the alum floc layer under reducing conditions.
ISSN:0018-8158
1573-5117
DOI:10.1007/BF00026731