Solar-integrated membrane distillation system for water purification
A solar-driven membrane distillation (MD) platform using high specific surface area hollow fiber membrane modules for water purification. The technology removes non-volatile dissolved impurities, addresses fouling and scaling challenges through advanced surface modification, and offers a low energy footprint alternative to reverse osmosis for contaminated water treatment.
Overview
This solution offers a solar-integrated membrane distillation (MD) system for purifying contaminated water with a significantly reduced energy footprint. By leveraging high specific surface area hollow fiber membrane modules, the technology can remove all non-volatile dissolved impurities from aqueous media while operating around the clock without the common challenges associated with reverse osmosis. The modular design delivers over 800 square meters of effective surface area per cubic meter, making it suitable for handling target water flow rates with desired removal selectivity for dissolved ions. The approach addresses key industry pain points including fouling and scaling through advances in materials science and surface modification, while a collaborative heat management scheme ensures stable separation performance.
Technical specifications
- High surface area hollow fiber membrane modules designed specifically for membrane distillation, providing in excess of 800 m² effective surface area per m³
- Solar-driven process with promising exergy efficiency values validated through energy and exergy analysis
- Advanced surface modification that outperforms all other materials used to date for MD membrane fabrication
- Heat management scheme enabling stable separation process operation
- Fouling and scaling resistance demonstrated through experimental challenges with scaling conditions
- Photovoltaic-powered operation planned for further optimization
- Microrecuperator elements designed for integration within the MD module, powered by thermoelectric systems
- Cascade and multi-effect MD approach for simultaneous heat and water recovery
- Process integration including prefiltration skids and oxidation/ozonation for natural stormwater treatment
Technology readiness level
The technology has been validated through peer-reviewed publications and ongoing research since 2018. Experimental work has demonstrated that the developed surfaces are unique and outperform existing materials for MD membrane fabrication. The heat management scheme has been validated collaboratively, and the surfaces have been challenged for scaling and proven functional for the target application. Energy and exergy analyses have been conducted over the system, with the exergy analysis currently under review. Future validation plans include photovoltaic-powered operation, microrecuperator integration, cascade and multi-effect MD development, and scale-up testing using synthetic feed solutions with defined total dissolved solids and composition to measure water recovery ratios. Further analysis will incorporate prefiltration skids and oxidation/ozonation processes to expand the technology for natural, source-dependent stormwater applications.
About University of Nebraska, Lincoln
The University of Nebraska–Lincoln is a comprehensive public research university and the flagship campus of the University of Nebraska system, combining land-grant reach with a collaborative, industry-engaged culture. A research and technology park adjacent to campus provides modern wet and dry labs, greenhouses, offices, and conferencing, enabling companies to co-locate with faculty and access shared equipment and pilot environments. A statewide extension network links university expertise with producers and communities, creating rapid pathways for field trials, demonstrations, and workforce pipelines. Research is supported by competitive federal funding from NSF, USDA, DOE, and NIH. A dedicated technology transfer office manages IP, licensing, agreements, and startup formation with industry-friendly terms.
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