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Kostenabschätzung und -effizienz von Maßnahmen im Oder-Einzugsgebiet zur Reduzierung von Nährstoffeinträgen in die Ostsee
The paper gives a brief overview on the current state of the art of cost-efficiency analysis concerning measures to reduce nutrient immissions into the Baltic Sea. On the basis of a literature review it develops a methodology for a rough estimation of the cost-efficiency of measures intended to reduce nutrient immissions into the Odra river basin and the Odra Estuary. The results are presented as annual marginal costs and absolute costs of the respective measures. Agricultural measures prove to be the most efficient means to reduce nutrient immission – but only up to certain threshold levels and following uneven regional patterns. To realise radical cuts in nutrient immissions, a combined strategy integrating agricultural and waste water treatment oriented measures would be necessary. The preliminary results presented in this paper suggest threshold levels for reductions of nitrogen immissions into the Odra river at around 2500 t per year from point sources and around 3000 to 5000 t nitrogen immissions from diffuse sources. Annual reduction costs at these levels would be 38 million € for waste water treatment and between 30 and 60 million € for agricultural measures. Concerning phosphorus, a reduction up to 450 t by improvement of treatment technologies appear to be feasible at annual costs of approximately 7 million €. The work on this task will be finished in spring 2010 with including more measures and cost functions into the MONERIS model system.
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