In Our Research
We focus on the advancement of membrane technologies and innovative solutions to address urgent challenges related to water quality and availability. We are currently working on projects focused on seawater desalination using RO, MD, FO, and hybrid methods, and exploring emerging technologies for wastewater treatment, pollutants removal, and membrane fabrication using various materials.
Our Research Interests
Membrane distillation (MD) for wastewater treatment and resource recovery
We have been conducting research on a wide variety of membrane distillation (MD) applications with the goal of gaining a fundamental understanding of its vapor transportation mechanism in conjunction with membrane wetting and fouling behaviours. We are focused on the development of novel membrane materials and module designs for use in membrane distillation processes.
With industry support, we are now upscaling MD for the treatment of textile wastewater, which highlights two of MD’s notable advantages over conventional methods. Firstly, the project explored MD’s potential for using waste heat, enhancing MD’s energy efficiency and reducing costs. Secondly, the recovery and reuse of permeate water generated by the MD process for washing and reuse in internal production lines was explored, again underlining the positive environmental impact and cost efficiency of the MD process for the textile industry as well as MD’s potential feasibility for zero liquid discharge.
Prof. Alicia An and her group developed a hybrid polydimethylsiloxane (PDMS) polymeric microspheres-PVDF superhydrophic membrane via electrospinning. The membrane exhibited antifouling characteristic when treating differently-charged dyes wastewater. Such ideal membrane can be applied in Membrane Distillation for wastewater treatment.
Seawater desalination using membrane technology
Our group is working on Desalination as a sustainable water resource based on emerging membrane technologies such as Membrane Distillation (MD), Forward Osmosis (FO), and hybrid process with Reverse Osmosis (RO). Moreover, we are striving to achieve the concept of resource recovery from brine produced from desalination processes. Our team has proposed a novel membrane distillation-crystallizer (MDCr) for achieving energy-efficient desalination and resource recovery. Below is a picture that illustrates the prototype crystallizer which has been developed as part of our Innovation and Technology Fund (ITF) project.
Prototype of the proposed membrane distillation-crystallizer
Seawater desalination using membrane technology
Our group’s research interest lies primarily in the fabrication and practical applications of advanced polymeric membranes for use in water treatment, wastewater reclamation and desalination applications. In our lab, we use different techniques including phase inversion, interfacial polymerization, surface coating, track-etching, electrospinning etc. to develop advanced organic, inorganic, and nano-enabled polymeric membranes for nearly each membrane-based process (microfiltration, ultrafiltration, nanofiltration, reverse/forward osmosis and membrane distillation). Intriguingly, our in-house fabricated membranes presented practical solutions for preventing membrane fouling while retaining salts, heavy metals, and various organic micropollutants.
Optical Coherence Tomography (OCT), GANYMEDE-II OCT system
Film applicator (Elcometer 4340)
Electrospinner, ET-2535
Beijing Ucalery Technology and Development Co., Ltd
Drop Shape Analyzer for contact angle measurements and surface free energy calculation with High Resolution and High-Speed Camera -DSA25S, KRÜSS GmbH
Capillary flow porometer, Porolux 1000, Germany
Emerging membrane fabrication and application
One of our forward-looking research interests is to utilize solar energy in water treatment to make this process readily available for developing countries/regions with abundant solar irradiation. To accomplish such a goal, we aim to adopt the photothermal effect to membrane distillation processes. Heat created by photothermal materials can drive water vapor across the membrane requiring less electricity to be used. Carbon-based materials, which are non-toxic and cost-effective, are chosen as the light-to-heat converter. We fabricate nanostructured carbon materials with enhanced light absorbing ability, weakened thermal conductivity, and porous network for vapor channels to achieve highly efficient distillation to produce clean water.
Hybrid system for pilot-scale water treatment application
Our research team is dedicated to implementing our findings in practical wastewater treatment processes, to advance water treatment technology and promote diverse development. We are working on a project where we develop a pilot-scale FO/RO system with a 20 tons/day capacity. By utilizing the distinctive feature of FO, which eliminates the need for additional pressure, we could concentrate filtered wastewater for more than 50% (and even up to 80%). By feeding FO-treated salt water to RO and adding an electrolyzer, we can produce clean RO permeate and utilize unrejected ammonia and OCl to create monochloramine. This results in a lower fouling potential achieved by in-situ chloramination cleaning, which facilitates the downstream process of resource recovery.
Pilot FO/RO System
Sand Filtration Pre-treatment
FO module
Pilot Electrolyzer
RO module