NP Harvest

Catching nutrients from waste waters.
Nutrient catchers at work


Startup company



Looking for:



Clean water and sanitation, Industry, innovation and infrastructure, Life below water


Engineering technology




School of Engineering

NPHarvest recovers the essence of life. Billions of euros worth of good fertilizer nutrients are wasted worldwide every year. With the new technology, NPHarvest can recover both phosphorus and nitrogen from waste flows, reducing treatment costs and decreasing greenhouse gas emissions. The recovery process yields profit without the need for subsidies.

NPHarvest at its core is a research project aiming to enable efficient and profitable nutrient recycling from waste flows to the (fertilizer) market. Our technological development is at pilot scale and we're currently working on commercializing our technology. The technology is based on energy efficient hydrophobic membrane stripping for ammonia and ballasted sedimentation of phosphorus with lime. 

Several different methods for nitrogen and phosphorous removal are currently utilized but none of them are not implemented for harvesting the nutrients. We have developed a new method for recovering nitrogen and phosphorous from different liquid waste fractions, where already functioning processes and reactions have been combined in an innovative way so that a "process of a new age" has been born.

Recovery is based on using calcium hydroxide Ca(OH)2 to transform ammonium nitrogen NH4+ to gas ammonia NH3. Ammonia is separated by stripping through a GPHM (gas permeable hyrdophobic membrane). This enhances the energy efficiency of the process significantly. Separated NH3 reacts with an sulfuric acid to ammonium sulfate but we can also use phosphoric or nitric acid to produce different ammonia salts. Phosphorous is precipitated with calcium salts. The process does not require a warm environment so it is suitable for Finnish environment.


 Juho Kaljunen

Juho Kaljunen


Timo Rossi

Spinoff Portfolio Manager

Turning wastewater nutrients into fertiliser

The NPHarvest process allows for the recovery of nitrogen and phosphorus from wastewater.

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