Updates from Aalto University

A new method for converting wastewater nutrients into fertilizer
By Riku Vahala – Researchers of Aalto University have developed a new, energy-efficient method for capturing nitrogen and phosphorus from different liquid waste fractions. In laboratory studies, with the help of the method, it is possible to separate 99% of the nitrogen and 90-99% of phosphorus in wastewater and produce granular ammonium sulphate (NH4)2SO4 and phosphorus precipitate suitable for fertilizers.

The capture method is based on the use of calcium hydroxide Ca(OH)2 to convert ammoniacal nitrogen NH4+ into ammoniacal gas NH3, which are separated through a semi-permeable membrane. Following this, the ammonium is dissolved into sulphuric acid to produce ammonium sulphate. In the process, the phosphorus is precipitated with the help of calcium salt.

‘A patent application for the method is currently under way, and the aim of the project is to find company partners who could make use of the patent in the best possible manner, create products with its help and market the new process. If successful, the new process will also create a competitive export product’, Anna Mikola, DSc (Tech), points out. more> https://goo.gl/kOrqHP

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