The potential of forward osmosis in reducing water consumption in hemodialysis

Hemodialysis is a life-sustaining treatment for patients with end-stage renal disease, but it is notoriously resource-intensive, requiring vast quantities of high-purity water. This significant water footprint presents economic and environmental challenges, particularly in water-scarce regions. Forward osmosis (FO), an emerging membrane technology, offers a promising alternative to conventional reverse osmosis (RO) for dialysate preparation and regeneration by leveraging osmotic energy rather than hydraulic pressure. This literature review synthesizes current research on the application of FO in hemodialysis, focusing on its potential to reduce water usage, its operational principles, and the technical challenges hindering its widespread adoption. The analysis covers FO's roles in direct dialysate preparation from tap water and spent dialysate regeneration, its energy efficiency advantages, and critical hurdles such as membrane performance and draw solution recovery. The review concludes that while FO holds considerable promise for creating more sustainable and portable dialysis systems, targeted research into membrane optimization, biocompatible draw solutions, and hybrid systems is essential for its clinical translation.