Dr. Đào Thành Dương, who is now a lecturer in charge of lectures and research on the courses of water and waste water treatment – environmental impact assessment – solid waste management, at the Water, Environment, Oceanography Department of USTH, recently had a mission at INSA Toulouse (France), and thereafter had a scientific paper published on Journal of Separation and Purification Technology
, which is available at: http://www.sciencedirect.com/science/article/pii/S1383586615303415
. Dương did his Ph.D. in water treatment by membrane processes at Laboratoire d’Ingénierie des Systèmes Biologiques et des Procédé, LISBP (INSA Toulouse) from 2010 – 2013. Prior to that, he got his Master of Sciences with the thesis "Application of advanced oxidation processes (AOPs) in treating leachate from landfills in HCM City, Vietnam” at the Sub-department of Environmental Technology and Management, Wageningen University, the Netherlands from 2003 – 2005.
This is his second scientific paper so far, while the first one was "Dao, T.D., et al., A new method for permeability measurement of hydrophobic membranes in Vacuum membrane distillation process, Journal of Water Research 47 (2013) 2096 - 2104
." Congratulations to Dương, and USTH is so proud to be the momentum for your future achievements! Abstract: Arsenic contamination of shallow ground water is being one of the biggest health threats in the world, particularly in Asia. In this work, vacuum membrane distillation (VMD) was proposed as an advanced solution for arsenic removal. The case study concerned arsenic contamination in Vietnam, where drinking water resources present not only high arsenic concentration (1–3050 ppb) but also high salinity (5–15 g/L). For that reason, synthetic brackish solutions containing NaCl (10 g/L) and As(III) (at different concentrations – between 300 and 2000 ppb) were used as feed solution in this study. As a result, VMD was capable to satisfy As(III) rejection to meet the required standard in the permeate (MCL = 10 ppb). Salt rejection was also very high (>99.5%). The As(III) rejection rate was always stable at high level (>98.5%), irrespective of high feed As(III) concentrations (up to 2000 ppb). With VMD, a pre-oxidation step was not necessary to convert As(III) into As(V), as it is the case for other conventional treatment processes. Furthermore, no effect of organic matter (humic acid) and calcium on membrane scaling and fouling phenomena was observed at the given concentration in this study.