Water. Desalination + reuse
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34 View From March 2017 Water.desalination+reuse Results & Discussion Conclusion An established and structured qualification procedure allows the screening of hundreds of polymeric formulations. The most promising formulation, made of PSU-PEO-Polysiloxane, shows a significantly improved resistance to fouling, allowing operation at higher flux rates, lower TMP and with lower chemical usage. Introduction Polymeric Ultrafiltration membranes are successfully used in all types of water treatment. A further water cost reduction can be A further water cost reduction can be A further obtained by process modifications as well as improving the cleaning efficiency of membranes. BASF together with its specialized membrane subsidiary, inge ® , are active in both directions. This poster presents the development of a novel surface-modified ultrafiltration membrane material, which exhibits an improved anti-fouling performance and in turn allows a high flux membrane operation. inge ® Multibore ® fiber Chemical structure of the PSU-PEO-PSilox copolymers Methodology 0.001 m² Model Foulant Short-term fouling test Long-term fouling test: river / waste / sea water 7-10 fibers 40 cm long module 0.02 m 2 7-10 fibers 150 cm long module 0.3 m 2 2000 fibers Full scale module 60 m 2 Flat Sheet Multibore ® fiber Lab scale Testing Pilot Testing 500 Formulations 100 Formulations 3 Formulations 1 Formulation Atomic Force Microscopy (AFM) The tip of Atomic Force Microscopy (AFM) was coated. The adhesion forces of both hydrophobic and hydrophilic molecules on the PSU-PEO-PSilox membrane are much lower than on the reference membrane. Schematic representation Measurement of additive content Adhesion force on membrane surface TMP of Siloxane membrane lower even at a flux ~ 20-30 % higher Seawater Open seawater intake Piloting duration: 7 months Wastewater Municipal & industrial wastewater Piloting duration: 6 months Polyaluminiumchloride addition at 3 ppm Al upstream the membranes Siloxane membrane operation at a flux 17% higher permeability higher by ~ 30% Under identical flux Under different flux (similar TMP) Impact of chemistry-based modifications of membrane surfaces on sustainable flux levels in a variety of water types Martin Heijnen *, Martin Weber, Denis Vial, Peter Berg * inge GmbH, Flurstrasse 27, 86926 Greifenberg, Germany – mheijnen@inge.ag Siloxane membrane permeability higher by 30-40% Membrane Analysis Surface modification achieved by enriching copolymer additives (polysulfone- polyethylene-oxide-polysiloxane, PSU- PEO-PSilox), on the membrane surface and provides an anti-adhesive effect against organic foulants. Operating Conditions Surface Water Large reservoir Piloting duration: 3 months No coagulant dosage Long-Term Evaluation Comparison of full-scale modules (reference membrane and PSU-PEO-PSilox membrane) operated on different types of water under identical flux and under similar TMP Peter Berg Martin Heijnen Permeability (L/m 2 .h.bar at 20°C) Flux (L/M 2 .h) 0 1 2 3 4 5 6 7 0 1 2 3 4 5 200 160 120 80 40 0 1000 800 600 400 200 0 Permeability (L/m 2 .h.bar at 20°C) Flux (L/M 2 .h) 0 1 2 3 4 5 6 7 0 1 2 3 100 80 60 40 20 0 1000 800 600 400 200 0 Results & Discussion Introduction Polymeric Ultrafiltration membranes are successfully used in all types of water treatment. A further water cost reduction can be obtained by process modifications as well as improving the cleaning efficiency of membranes. BASF together with its specialized membrane subsidiary, inge ® , are active in both directions. This poster presents the development of a novel surface-modified ultrafiltration membrane material, which exhibits an improved anti-fouling performance and in turn allows a high flux membrane operation. inge ® Multibore ® fiber Chemical structure of the PSU-PEO-PSilox copolymers Methodology 0.001 m² Model Foulant Short-term fouling test Long-term fouling test: river / waste / sea water 7-10 fibers 40 cm long module 0.02 m 2 7-10 fibers 150 cm long module 0.3 m 2 2000 fibers Full scale module 60 m 2 Flat Sheet Multibore ® fiber Lab scale Testing Pilot Testing 500 Formulations 100 Formulations 3 Formulations 1 Formulation Atomic Force Microscopy (AFM) The tip of Atomic Force Microscopy (AFM) was coated. The adhesion forces of both hydrophobic and hydrophilic molecules on the PSU-PEO-PSilox membrane are much lower than on the reference membrane. Schematic representation Measurement of additive content Adhesion force on membrane surface TMP of Siloxane membrane even at a flux ~ 20-30 % higher Under identical flux Under different flux (similar TMP) Impact of chemistry-based modifications surfaces on sustainable flux levels in a variety Martin Heijnen *, Martin Weber, Denis Vial, Peter Berg * inge GmbH, Flurstrasse 27, 86926 Greifenberg, Germany – mheijnen@inge.ag Siloxane membrane permeability higher by 30-40% Membrane Analysis Surface modification achieved by enriching copolymer additives (polysulfone- polyethylene-oxide-polysiloxane, PSU- PEO-PSilox), on the membrane surface and provides an anti-adhesive effect against organic foulants. Operating Conditions Surface Water Large reservoir Piloting duration: 3 months No coagulant dosage Long-Term Evaluation Comparison of full-scale operated on different Permeability (L/m 2 .h.bar at 20°C) 0 1 2 3 4 1000 800 600 400 200 0 Permeability (L/m 2 .h.bar at 20°C) 0 1 2 1000 800 600 400 200 0 Perm. Ref. Mod. DIAGNOSTIC TOOLS • The current reliance on normalisation to track reverse osmosis system performance dri is a reactive approach that can lead to operator/ management/engineer disconnect • The use of data diagnostic tools can optimise plant and management • A case study of a cleaning pump failure in an RO train in southern California showed that a diagnostic approach could deliver more robust cleaning • Diagnostics allow for plan-ahead maintenance and an extended membrane life POLYMERIC ADDITIVES • BASF's Inge subsidiary screened hundreds of polymeric formulations to develop a membrane with greater fouling resistance • The use of enriched co-polymer additives (PSU-PEO-Polysiloxane) on the membrane surface increased the anti-adhesive effect against organic foulants • The surface-modifi ed ultrafi ltration polymeric membrane allowed operation at higher fl ux rates, lower trans membrane pressure and lower chemical usage