Abstract
The nutrient situation and nutrient removal policy in Finland are discussed and the principles of biological phosphorus removal are outlined. The approach of Metsä-Serla Oy to the nutrient problem is described: Metsä-Serla has been studying biological phosphorus removal since 1987. At the beginning of 1989 plant-scale experiments were started at the Kirkniemi paper mill. The results have been promising, the highest removal rates obtained being over 90 %. Experimenting with biological phosphorus removal will be started at all Metsä-Serla's activated sludge plants (five in all) in the near future.
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