REJUVENATION OF REVERSE OSMOSIS MEMBRANES DEGRADED BY CHLORINE IN THE PRESENCE OF FERRIC CHLORIDE

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Date

2022-12-23

Author

BARI, MUHAMMAD INAM

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Water stress is increasing day by day across the globe due to unsustainable water management practices. Water reclamation including waste water treatment and sea water desalination are key sustainable processes carried out to meet fresh water demand. Reverse osmosis (RO) technology using membrane separation is mainly used for water reclamation and sea water desalination. Membranes separate out monovalent ions, pathogens and organic matter from water. Thin film composite (TFC) polyamide membranes are latest used membranes which provide high solute rejection and permeate flux. Unfortunately, these polyamide membranes are sensitive to oxidants such as chlorine used in disinfection and metal ions found in water treatment train. Therefore, membranes are degraded with chlorine and metal ions and this inhibit their normal separation operation. Rejuvenation of membranes is the promising technique used to restore the salt rejection performance of mildly oxidized membranes. This thesis investigates the effectiveness of commercial rejuvenation agent on chlorine and metal degraded membranes. Firstly, membranes were degraded with hypochlorite and metal ferric chloride under different pH conditions on active scale and selectivity was evaluated through lab scale experimentation. Later on, rejuvenation treatment was applied on degraded membranes and their salt rejection and permeate flux performance was observed after the rejuvenation. FTIR-ATR analysis was used to observe the chemical vi structural changes in the membranes. The outcome of this study show that the degradation of the membranes was accelerated with hypochlorite and ferric chloride. Salt rejection was successfully restored for mildly oxidized and metal degraded membranes by providing sustainable solution to reuse discarded membranes.

Subject Keywords

RO Membranes, Rejuvenation, Active Metal Degradation, Ferric Chloride, Sustainability

URI

https://hdl.handle.net/11511/101965

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Northern Cyprus Campus, Thesis

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Citation Formats

M. I. BARI, “REJUVENATION OF REVERSE OSMOSIS MEMBRANES DEGRADED BY CHLORINE IN THE PRESENCE OF FERRIC CHLORIDE,” M.S. - Master of Science, Middle East Technical University, 2022.