One critical point during the inventory development was the estimation of solvent losses through BREF documents. The inventories of the commercial membranes were developed through membrane surface characterisation techniques, patents and lab protocols. OpenLCA 1.7.4 with Ecoinvent v3.4 and ILCD-midpoint and endpoint impact methods were used. To introduce the membrane performance comparison, a substitutability factor (SF) was developed with the flow ratio. The recycling strategy was compared with commercial Thin Film Composite (TFC) and Cellulose Triacetate (CTA) membranes at two different solution concentrations. Therefore, a Life Cycle Assessment (LCA) was conducted with a substitution approach. This study aims to assess the environmental potential of the above-mentioned recycling strategy. This strategy achieves the valorisation of 69% of the membrane area and 63.7% of the plastic components. Membrane modules are chemically modified and disassembled. Recycling end-of-life (EoL) reverse osmosis (RO) membrane modules into forward osmosis (FO) membranes is an innovative alternative to approach membrane science into Circular Economy (CE).
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