RT Journal Article
T1 Removal of TiO 2 nanoparticles from water by low pressure pilot plant filtration
A1 Olabarrieta, Josune
A1 Monzón, Oihane
A1 Belaustegui, Yolanda
A1 Alvarez, Jon-Iñaki
A1 Zorita, Saioa
AB Rising use of nanoparticles in manufacturing as well as in commercial products bring issues related to environmental release and human exposure. A large amount of TiO2 nanoparticles will eventually reach wastewater treatment plants. Low pressure membrane filtration has been suggested as a feasible treatment of water streams. This study investigated first at laboratory scale the influence of: i) membrane material, ii) pore size and iii) water chemistry on nTiO2 removal. TiO2 retention was governed by the cake layer formation mechanism and significant retention of nanoparticles was observed even for filters having considerably larger pores than nTiO2. PVDF showed a great potential for nTiO2 rejection. Additionally, filtration pilot plant experiments were carried out using PVDF membranes (0.03 and 0.4 μm pore size). The release of nTiO2 in the pilot scale filtration system was always above the instrumental detection limit (> 1.5 μg/L) and in most cases below 100 μg/L regardless of the pore size and applied conditions. The nTiO2 membrane breakthrough predominantly occurred in the first few minutes after backwashes and ceased when the cake layer was formed. Ultrafiltration and microfiltration were comparable with rejection of nTiO2 above 95% at similar permeate flow rates. Nevertheless, ultrafiltration is more promising than microfiltration because it allowed longer operation times between backwash cycles.
SN 0048-9697
YR 2018
FD 2018-03-15
LA eng
NO Olabarrieta , J , Monzón , O , Belaustegui , Y , Alvarez , J-I & Zorita , S 2018 , ' Removal of TiO 2 nanoparticles from water by low pressure pilot plant filtration ' , Science of the Total Environment , vol. 618 , pp. 551-560 . https://doi.org/10.1016/j.scitotenv.2017.11.003
NO Publisher Copyright: © 2017 Elsevier B.V.
DS TECNALIA Publications
RD 1 jul 2024