Z Mi, Z. Zhao, S Woo, M. Bugnet, M Djavid, et al.. Molecular beam epitaxial growth and characterization of Al(Ga)N nanowire deep ultraviolet light emitting diodes and lasers. Journal of Physics D: Applied Physics, IOP Publishing, 2016, 49 (36), pp.364006. ⟨hal-01973292⟩ Plus de détails...
Z Mi, Z. Zhao, S Woo, M. Bugnet, M Djavid, et al.. Molecular beam epitaxial growth and characterization of Al(Ga)N nanowire deep ultraviolet light emitting diodes and lasers. Journal of Physics D: Applied Physics, IOP Publishing, 2016, 49 (36), pp.364006. ⟨hal-01973292⟩
H. Guo, Yvan Wyart, J. Pérot, F. Nauleau, Philippe Moulin. Magnetic nanoparticles for UF membrane integrity: industrial scale. Medical Engineering and Physics, Elsevier, 2011, 2 (1), pp.51-61. ⟨10.12989/mwt.2011.2.1.051⟩. ⟨hal-01026454⟩ Plus de détails...
An alternative ultrafiltration membrane integrity test was already developed in laboratory scale. It is based on the use of magnetic nanoparticles (Fe3O4) and measurement of magnetic susceptibility. The mean size of nanoparticles used is around 35 nm and they show a good disparity between 20 and 100 nm. In this paper, validation of this membrane integrity monitoring method was achieved by industrialscale tests. Two holes with 0.6 mm internal diameter in a module containing 10 000 fibers (35 m2 surface area) was efficiently detected by injecting 750 mL of 1.7 g.L−1 nanoparticle solution during 2s when the test was operated at low TMP (0.096 bar, corresponding to a flux of 2.2 m3.h−1). In addition, it has been demonstrated that within the detectable range, this membrane integrity test with magnetic nanoparticles has a very rapid response time. The response time depends on the permeate flux and the dead-volume of the pilot. This membrane integrity test, with the advantages of on-line operation, high detection sensitivity, detection specificity and very low influence on membrane fouling, seems to be suitable for large scale drinking water plants.
H. Guo, Yvan Wyart, J. Pérot, F. Nauleau, Philippe Moulin. Magnetic nanoparticles for UF membrane integrity: industrial scale. Medical Engineering and Physics, Elsevier, 2011, 2 (1), pp.51-61. ⟨10.12989/mwt.2011.2.1.051⟩. ⟨hal-01026454⟩
H. Guo, Yvan Wyart, J. Perot, F. Nauleau, Philippe Moulin. Low-pressure membrane integrity tests for drinking water treatment: a review. Water Research, IWA Publishing, 2010, 44 (1), pp.41-57. ⟨10.1016/j.watres.2009.09.032⟩. ⟨hal-01025143⟩ Plus de détails...
Low-pressure membrane systems, including microfiltration (MF) and ultrafiltration (UF) membranes, are being increasingly used in drinking water treatments due to their high level of pathogen removal. However, the pathogen will pass through the membrane and contaminate the product if the membrane integrity is compromised. Therefore, an effective on-line integrity monitoring method for MF and UF membrane systems is essential to guarantee the regulatory requirements for pathogen removal. A lot of works on low-pressure membrane integrity tests have been conducted by many researchers. This paper provides a literature review about different low-pressure membrane integrity monitoring methods for the drinking water treatment, including direct methods (pressure-based tests, acoustic sensor test, liquid porosimetry, etc.) and indirect methods (particle counting, particle monitoring, turbidity monitoring, surrogate challenge tests). Additionally, some information about the operation of membrane integrity tests is presented here. It can be realized from this review that it remains urgent to develop an alternative on-line detection technique for a quick, accurate, simple, continuous and relatively inexpensive evaluation of low-pressure membrane integrity. To better satisfy regulatory requirements for drinking water treatments, the characteristic of this ideal membrane integrity test is proposed at the end of this paper.
H. Guo, Yvan Wyart, J. Perot, F. Nauleau, Philippe Moulin. Low-pressure membrane integrity tests for drinking water treatment: a review. Water Research, IWA Publishing, 2010, 44 (1), pp.41-57. ⟨10.1016/j.watres.2009.09.032⟩. ⟨hal-01025143⟩
H. Guo, Yvan Wyart, J. Perot, F. Nauleau, Philippe Moulin. Application of magnetic nanoparticles for UF membrane integrity monitoring at low-pressure operation. Journal of Membrane Science, Elsevier, 2010, 350 (1-2), pp.172-179. ⟨10.1016/j.memsci.2009.12.025⟩. ⟨hal-01025137⟩ Plus de détails...
An alternative ultrafiltration membrane integrity test is presented and evaluated, based on the use of magnetic nanoparticles (Fe3O4) and measurement of magnetic susceptibility. The mean size of nanoparticles used is around 35 nm and they show a good disparity between 20 and 100 nm. A series of integrity tests were carried out on a Norit membrane module containing 100 fibers under a low transmembrane pressure of 0.25 bar. The results showed that no magnetic susceptibility was detected in permeate when the tests were performed on the intact module in both cross-flow and dead-end filtration, indicating the complete nanoparticle retention by the intact module. However, when even one fiber was broken in the module (1% breakage rate), magnetic susceptibility of permeate could be detected instantaneously even at feed concentrations as low as 1.2 ppm with Bartington magnetic susceptibility meter. This detection is valid during all the filtration process. The results also showed that the membrane permeability could be completely recovered after a backwash. This membrane integrity test, with the advantages of simplicity, on-line operation, high detection specificity and sensitivity, quick detection and very low influence on membrane fouling, seems to be suitable for large-scale drinking water plants.
H. Guo, Yvan Wyart, J. Perot, F. Nauleau, Philippe Moulin. Application of magnetic nanoparticles for UF membrane integrity monitoring at low-pressure operation. Journal of Membrane Science, Elsevier, 2010, 350 (1-2), pp.172-179. ⟨10.1016/j.memsci.2009.12.025⟩. ⟨hal-01025137⟩
