TY - JOUR
T1 - Synergistic arsenic removal using chitosan-based nanocomposite beads and cross-flow ultrafiltration
T2 - A significant reduction of membrane fouling
AU - Rawat, Shweta
AU - Chaudhary, Mohit
AU - Maiti, Abhijit
N1 - Funding Information:
This research work has been funded by the Science & Engineering Research Board of the Department of Science Technology, Government of India , through the IMPRINT 2 A project scheme (File number IMP/2018/001228 ).
Publisher Copyright:
© 2023 Elsevier Ltd.
PY - 2023/4/1
Y1 - 2023/4/1
N2 - Hybrid adsorption-membrane processes provide a suitable alternative for treating large volumes of arsenic-contaminated water by combining the specificity of adsorption with the membrane process's flexibility in terms of scale-up. The performance of such processes, with respect to removal efficiency and effluent flow rate, largely depends on the characteristics of the adsorbent used. In the present study, we have evaluated the use of in-situ precipitated iron oxyhydroxide chitosan beads (IICB) in combination with cross-flow Ultrafiltration (UF) for the treatment of arsenic-contaminated water. The performance of the combined adsorption-UF process was assessed at three different TMP (0.2-0.6 MPa). Combined Hermia's model modified for cross-flow UF was found to be a good fit for permeate flux profiles of contaminated groundwater treated using the IICB-UF process. The effect of adding IICB on membrane fouling was evaluated using the resistance-in-series model and XDLVO theory (through contact angle measurements). For arsenic-spiked groundwater, at a dose of 2 g/L IICB, the combined UF process could bring down arsenic to permissible limits (<10 μg/L) and reduce irreversible fouling by up to 32 ± 2%. The reduction of free energy of adhesion and UV254 absorbance values indicated an overall decrease in fouling potential of contaminated feed. Thus, arsenic adsorption using bionanocomposite beads followed by UF (without separation of adsorbent beads prior to UF step) has operational advantages over either of the standalone treatment processes. A similar hybrid technology by varying suitable adsorbents can be successfully applied to remove other toxic pollutants as well.
AB - Hybrid adsorption-membrane processes provide a suitable alternative for treating large volumes of arsenic-contaminated water by combining the specificity of adsorption with the membrane process's flexibility in terms of scale-up. The performance of such processes, with respect to removal efficiency and effluent flow rate, largely depends on the characteristics of the adsorbent used. In the present study, we have evaluated the use of in-situ precipitated iron oxyhydroxide chitosan beads (IICB) in combination with cross-flow Ultrafiltration (UF) for the treatment of arsenic-contaminated water. The performance of the combined adsorption-UF process was assessed at three different TMP (0.2-0.6 MPa). Combined Hermia's model modified for cross-flow UF was found to be a good fit for permeate flux profiles of contaminated groundwater treated using the IICB-UF process. The effect of adding IICB on membrane fouling was evaluated using the resistance-in-series model and XDLVO theory (through contact angle measurements). For arsenic-spiked groundwater, at a dose of 2 g/L IICB, the combined UF process could bring down arsenic to permissible limits (<10 μg/L) and reduce irreversible fouling by up to 32 ± 2%. The reduction of free energy of adhesion and UV254 absorbance values indicated an overall decrease in fouling potential of contaminated feed. Thus, arsenic adsorption using bionanocomposite beads followed by UF (without separation of adsorbent beads prior to UF step) has operational advantages over either of the standalone treatment processes. A similar hybrid technology by varying suitable adsorbents can be successfully applied to remove other toxic pollutants as well.
KW - Arsenic
KW - Chitosan beads
KW - Combined adsorption-membrane process
KW - Iron oxyhydroxide adsorbent
KW - Ultrafiltration
UR - http://www.scopus.com/inward/record.url?scp=85148486287&partnerID=8YFLogxK
U2 - 10.1016/j.jece.2023.109431
DO - 10.1016/j.jece.2023.109431
M3 - Article
AN - SCOPUS:85148486287
SN - 2213-3437
VL - 11
JO - Journal of Environmental Chemical Engineering
JF - Journal of Environmental Chemical Engineering
IS - 2
M1 - 109431
ER -