ViviMag nominated for Water Innovation Prize 2018! 4/10/2018
Today the Unie van Waterschappen announced the nominees for the 2018 Water Innovation Prize.
ViviMag was nominated in the category 'Circular Economy'!
We are grateful to our partner Waterschap Brabantse Delta for motivating us to enter the competition, and for making space and resources available at their innovation Factory Nieuwveer to test the ViviMag pilot-installation.
Through cooperation with Waterschap Brabantse Delta, and our project partners Wetsus, TU Delft, Outotec, Kemira and EIT RawMaterials we were able to move quickly from fundamental research to pilot-testing this technology.
The winner will be decided by popular public vote. Pleas help us to win by voting for ViviMag here!
Today the Pilot-scale setup was succesfully installed at Innovation Factory Nieuwveer by our contractor Oosterhof Holman.
The pilot machine will demonstrate the feasibility of the process and allow optimization research to be carried out. New research possibilities will open up that were not possible to do with the bench-scale machine, such as:
- Scavenging (reprocessing) of tailings, to increase the recovery
- Cleaning (reprocessing) of concentrates, to increase the grade (purity product)
- Study the effects of the ViviMag process on the dewaterability and heating value of tailings.
The pilot-scale machine is able to process up to 1 m3 of sludge per hour, producing 4-6 kg of vivianite concentrate per hour. This will give us enough material to analyse and valorize for industrial use.
Bench-scale results 19/4/2018
Today the results of the first bench-scale separation tests were presented at the Phosphate Recovery theme meeting at Wetsus. The tests, performed with a bench-scale magnetic separator at the facilities of our project partner Outotec, were succesful. 60-70% of the vivianite from digested sewage sludge was recovered using ViviMag magnetic separation, without any optimization of the process or pre-processing of the sludge.
A concentrated vivianite product was created containing 11% phosphorus by weight. The theoretical maximum grade that can be achieved is 12,35% phosphorus (pure vivianite).
The tests showed that the amount of dry solids in the sludge can be reduced by 10% or more by recovering vivianite, this can significantly decrease sludge disposal costs for sludge treatment plants. Not only can Vivimag decrease disposal costs, it contributes to a circular economy by recycling the valuable and scarce nutrient phosphorus, as well as recovering iron that is used in the treatment process.
The next step is to test the separation on a bigger scale in a continuous process. The pilot-scale machine able to process 1 m3/h of sludge will be utilized for this. The pilot scale machine will open up new optimization possibilities, such as the scavenging of tailings and refining of the concentrate, and will produce sufficient amounts of concentrate to be tested as a feed material for the fertilizer industry.
In parallel to the feasibility study, there are research projects being carried out at Wetsus to stimulate vivianite formation in digested sewage sludge, and to optimize the magnetic separation of vivianite.
Start of Project 1/1/2018
As of 1st of January 2018 the Vivimag project started