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Researchers identify a simple way to precipitate phosphorus from the wastewater of a pulp mill
Date:11/21/2012

taneous precipitation, among other methods. The industry, on the other hand, is only just waking up to the possibility of applying simultaneous precipitation. Wastewater from the forestry industry contains less phosphorus than municipal wastewater, so the dosage of the iron chemical remains within reasonable limits.

Experiments at the pulp mill

Initially, the research was carried out in the laboratories of Otaniemi and at the plant using pilot equipment. The results were so promising that, later on; iron precipitation was also successfully tested at the wastewater treatment section of a pulp mill.

  • From the viewpoint of comprehensive environmental protection and sustainable development, the best method is always the one that saves energy and minimises the amount of waste. With the help of the studied simultaneous precipitation method, it is possible to completely avoid additional stages of wastewater treatment, reduce the amount of solid waste and save energy. Simultaneous precipitation produces hundreds of thousands of euros worth of savings in operating costs, as energy consumption and the need for additional chemicals is reduced, Professor Olli Dahl crystallises.

The research has been published in the Water Science & Technology journal.


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Contact: Sakari Toivakainen
sakari.toivakainen@aalto.fi
Aalto University
Source:Eurekalert  

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