NPHarvest

Project details

pilot in biogas plant

Technical process

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 be 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 efficiency of the process significantly. Separated NH3 reacts with an sulfuric acid to ammonium sulfate. Phosphorous is precipitated with calciumsalts. The process does not require a warm environment so it is suitable for Finnish environment.

NPHarvest_technical_process

Pilot updates

During spring 2020 the pilot was updated to scaled up specs. Pilot throughput is 10-fold compared to previous pretreatment unit and pilot has proper chemical tanks and automation to enable long process runs. Below is a 3D-model for the update.

NPHarvest update 3D

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