Uusitalo Risto, Närvänen Aaro, Kaseva Antti, Launto-Tiuttu Aino, Heikkinen Janne, Joki-Heiskala Päivi, Rasa Kimmo, Salo Tapio
Natural Resources Institute Finland, 31600, Jokioinen, Finland,
Ambio. 2015 Mar;44 Suppl 2(Suppl 2):S286-96. doi: 10.1007/s13280-014-0622-8.
Conversion of dissolved P by ferric sulfate into a particulate form sparingly available to algae was studied in 15 ditches in Finland using stand-alone dispensers for ferric sulfate administration. Ferric sulfate typically converted 60-70 % of dissolved P into iron-associated form, a process which required 250-650 kg per kg dissolved P. Mean cost was 160 EUR per kg P converted (range 20-400 EUR kg(-1)). The costs were lowest at sites characterized by high dissolved P concentrations and small catchment area. At best, the treatment was efficient and cost-effective, but to limit the costs and the risks, ferric sulfate dispensers should only be installed in small critical source areas.
在芬兰的15条沟渠中，使用独立的硫酸铁投加器，研究了硫酸铁将溶解态磷转化为藻类难以利用的颗粒态磷的过程。硫酸铁通常能将60%-70%的溶解态磷转化为与铁结合的形态，该过程每千克溶解态磷需要250-650千克硫酸铁。平均成本为每千克转化的磷160欧元（范围为20-400欧元/千克）。在溶解态磷浓度高且集水区面积小的地点，成本最低。该处理方法在最佳情况下既高效又经济，但为了限制成本和风险，硫酸铁投加器应仅安装在小型关键源区。
