UPM Institutional Repository

Removal of fine iron-oxide peprintss after post-filtration in local potable water using an electrophoretic method


Citation

Naim, Mohd Nazli and Yeon, Hui Ting and Zakaria, Rabitah and Baharuddin, Azhari Samsu and Md Yunos, Khairul Faezah and Abu Bakar, Noor Fitrah and Lenggoro, I. Wuled (2016) Removal of fine iron-oxide peprintss after post-filtration in local potable water using an electrophoretic method. Journal of Water Process Engineering, 9. pp. 208-214. ISSN 2214-7144

Abstract

Potable water from several residential areas on the east coast of Malaysia was filtered using a polyethersulphone (PES) membrane to separate the coarse and fine iron-oxide particles inside the pipelines. The as-received samples consisted of a wide distribution of particle sizes, ranging from 5 μm to 400 nm. The concentration of fine iron-oxide particles inside a distribution system was extremely low. Hence, a specific method is necessary to concentrate and separate the fine particles from the coarse ones. To study the fine particles from the bulk, excess pressure was applied to the membrane filter so that the clogged particles were released into the permeate. A 100 kDa PES membrane was used to separate the particles, because the samples consisted of a wide molecular-weight cut-off range from 89 g/mol goethite (α-FeOOH) to 231 g/mol hematite (Fe2O3). After the filtration process, the size distribution of permeated particles reduced to 550–400 nm. Through X-ray diffraction analysis, numerous polymorphs such as α-FeOOH, Fe3O4, Fe2O3 and maghemite were detected from the samples. The zeta potential value of the permeated particles changed from −18.5 to −13 mV, suggesting that the dispersity of permeated iron-oxide particles became unstable, but remained adequate for electrophoretic deposition (EPD). The fibrous carbon electrode used in the EPD process, could remove up to 87% of the permeated iron-oxide particles compared to solid carbon electrodes (<56%). A high-surface-area, porous electrode and a moderate applied voltage were preferred in order to minimise gas formation, reduce the electro-osmosis effect and increase the deposition efficiency.


Download File

[img]
Preview
PDF
Removal of fine iron-oxide particles after post-filtration in local potable water using an electrophoretic method.pdf

Download (155kB) | Preview

Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
DOI Number: https://doi.org/10.1016/j.jwpe.2016.01.006
Publisher: Elsevier BV
Keywords: Electrophoretic deposition; Fibre electrodes; Limiting flux; Iron oxide; Zeta potential
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 16 Jan 2018 10:13
Last Modified: 16 Jan 2018 10:13
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.jwpe.2016.01.006
URI: http://psasir.upm.edu.my/id/eprint/53771
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item