December 2018 update - Decentralised systems for water supply in developing countries

Testing of second generation system

The second generation of the brackish water 
desalination system (GEN 1.b)

One of the aims of the REvivED water project is to develop a brackish water desalination system based on capacitive electrodialysis [1]. The project will combine innovative design and high performing components with appropriate pre- and post-treatment techniques to enable the development of a simple and robust stand-alone system. The use of solar energy for the system’s power needs allow its application in developing countries where high-quality drinking water will be supplied to local populations in rural areas without any alternative solutions.

Building on six months of operational experience and lessons learned from the first-generation system pilot study in Somaliland, the second generation of the brackish water desalination systems (GEN 1.b) (Fig.1) was successfully constructed in mid-November and is now undergoing testing. In contrast to the first generation, the newer version can run a Feed & Bleed operation, increasing the recovery rate of water. Two plants using this new system will be installed in Tanzania and Ethiopia at the beginning of 2019. Another system, to be used in Belgium for benchmarking purposes, will also be assembled and tested in 2019.

Furthermore, a new design of the Capacitive electrodialysis stack is under investigation. This design leads to more efficient operation, with lower energy requirements and subsequently lower costs. The plan is to use that design for the second and third-generation system, to be tested in the second half of 2019.