Water mining

The WATER-MINING project aims to provide examples for real-world implementation of the Water Framework Directive to help the transition to Circular Economy. Demonstrations of innovative technologies in Cyprus, Spain, Portugal, Italy, and The Netherlands will be built to show novel efficient ways to reclaim nutrients, minerals, energy, and water from industrial and urban wastewater and seawater. The WATER-MINING project is funded with €17 million and runs from 1st September 2020 until 31st August 2024. The consortium consists of 38 public and private partners and 4 linked third parties in 12 countries across Europe and is coordinated by Delft University of Technology.

Wetsus participates in the project with our Phosphate Recovery theme. Wetsus will investigate and develop a suitable phosphorus (P) recovery method for wastewater treatment plants that use NEREDA® technology and discover synergies with Kaumera Nereda® Gum extraction.  Furthermore, two technologies for phosphorus removal and recovery will be demonstrated in Cyprus and Spain on pilot-scale. Reversible P adsorption on iron-oxide adsorbents (BioPhree) and a vivianite crystallization technology called ViviCryst.

Kaumera and phosphate

Kaumera Nereda® Gum is a new bio-based raw material extracted from the sludge granules that form during the Nereda® aerobic granular sludge purification process. An essential part of the WATER-MINING project is to develop an integrated resource recovery strategy to combine phosphate recovery with Kaumera extraction for Nereda® plants. This PhD research project is carried out by Nouran Bahgat in cooperation with Delft University of Technology.


Together with partner Aquacare, Wetsus works on the development of the BioPhree-technology. With BioPhree, iron-oxide-based adsorbents remove phosphorus from water to ultra-low levels (10-50 ppb). The adsorbents can be regenerated and re-used many times, making this technology cost-effective. Recovery of phosphorus is then possible from the regeneration liquid. This technology has been demonstrated before on pilot-scale for 3 months in Canada in the context of the George Barley Water Prize. In WATER-MINING, a new BioPhree pilot will be demonstrated for two years at wastewater treatment plants in Cyprus and Spain to remove and recover phosphorus from the effluents. The extended project duration provides many research opportunities for Wetsus and Aquacare, especially regarding adsorbent regeneration.


At the case study site in Spain, our phosphate recovery technologies will follow an AnMBR demonstration plant performed by project partner Eurecat. AnMBR does not remove phosphorus. By having the phosphorus in solution at the end of the wastewater treatment process, as with AnMBR, it can selectively be removed and recovered by dosing of chemicals. This idea is not new and is called post-precipitation. Common post-precipitation technologies being used or developed today use aluminium or ferric (3+) iron to precipitate and recover phosphorus. The downside of using these chemicals is the chemical sludge that is being formed, which is difficult to dewater and process.

At Wetsus, in the WATER-MINING project, we are developing a novel technology that will precipitate phosphorus as the crystalline mineral vivianite by dosing ferrous (2+) iron under anaerobic conditions. Using a fluidized bed reactor, this technology will also produce large crystals that are easy to handle and dewater and can have a destination as iron fertilizer or raw materials for production of flame retardant and batteries. This technology is being developed at bench-scale in the Wetsus lab and will be scaled up to pilot-scale in 2022 to be demonstrated at the case study site in Spain.

More information:
Water-Mining H2020

Contact: | Wokke Wijdeveld |
Project coordinator | Patricia Osseweijer | TU Delft
Communication leader | Nicole Heine | DECHEMA |

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The realisation of a circular economy has thus far unfolded under the assumption that it would fit within existing economic arrangements. In practice, we witness many circular initiatives struggling to give shape to their ambitions, let alone develop to maturity. These past months, various material recycling organisations terminated their activities, seeing virgin alternatives from other parts of the world flooding the market at prices against they cannot compete. If the transition towards a circular economy (i.e. an economy of value preservation) is to be taken seriously, a new perspective on value in our economic system seems unavoidable, as the rewriting of the rules of the economic game. At this moment, current perceptions of value stand in the way of this transition both at micro as well as macro levels. Several contours for a collective exploration of new directions of value and economic configuration that foster circular transition will be addressed.

Searching Innovation for the Common Good | By Cees Buisman


In his key note he will conclude after a life of innovations that it is impossible that humanity will stay within the save planetary boundaries with innovation only. We should be more critical about the behaviour of the rich population in the world and more critical about new innovations that prove to be dangerous, like the PFAS crisis shows at this moment. In his keynote he will investigate how to look at the world that can stay within the save planetary boundaries, how should we change ourselves? It is clear if we only talk about the words of science and systems we miss the essential words of how we should cooperate and change ourselves. And his search for coherent save innovations. Which innovations will be save and will lead to a fair and sustainable world? And will lead to a world we want to live in.

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There is a growing number of new sustainable, inclusive, cohesive, participatory, just and humane economic models. A possible next step in the discourse about them is the comparative analysis in order to find out key commonalities, potential synergies, and “requirements” for a future-fit economic model. The author and initiator of the Economy for the Common Good provides an overview of these „new sustainable economic models“ and compares them according to underlying values, principles, and practical ways of implementation. The keynote addresses the cooperative spirit of the conference and prepares the ground for its public highlight on the eve of June 3rd, the round table with representatives of diverse future-fit economic models.

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