Abstract
Phytoplankton batch cultures were used to study the effect of biologically and chemically treated wastewater on algal growth in water from Lake Zürich. The question of whether the influence of sewage on the biomass production corresponds solely to the nutrient content of the sewage was also considered. The relationship between net microbial production (y, in 0.1 N KMnO4 consumption) and total phosphorus concentration (x, in µg P/1) was found to be characterized by the equation y = 2.12 ln x − 4.12. The fact that net microbial production is strongly dependent on total phosphorus concentration emphasizes the significance of the latter for the trophic state of Lake Zürich. We recommend the introduction of additional purification of all sewage entering the lake.
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Lehmacher, C., Schanz, F. Examination of the effect of wastewater on the productivity of Lake Zürich water using indigenous phytoplankton batch culture bioassays. Hydrobiologia 188, 229–235 (1989). https://doi.org/10.1007/BF00027788
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DOI: https://doi.org/10.1007/BF00027788