Application and environmental impact of loose nanofiltration in surface water treatment

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2024-04
Major/Subject
Mcode
Degree programme
Language
en
Pages
10
Series
JOURNAL OF WATER PROCESS ENGINEERING, Volume 60
Abstract
Loose nanofiltration (LNF) membranes with a molecular weight cutoff (MWCO) of about 1000 Da have great potential for high selectivity between natural organic matter (NOM) and mineral salts. Therefore, they are interesting for treatment plants for purifying oligotrophic lake waters with an elevated NOM concentration. This study was conducted to determine the design and operational expenses as well as the environmental impact of an LNF-based drinking water treatment process that removes NOM from Finnish surface water. Two LNF membranes with similar MWCOs were selected, and the results were compared to ultrafiltration, nanofiltration, and conventional treatment. One LNF membrane demonstrated a rejection rate of NOM higher than 95 % and a low rejection rate of hardness at about 40 %, while the other LNF membrane performed similarly to an ultrafiltration membrane. The LNF-based treatment process would increase operational expenses by 53—69 % but at the same time decrease the environmental impact by >18 %. Improved removal of aromaticity and low molecular weight compounds could lower the disinfection byproduct formation potential and microbial growth in the network, thus reducing the required chlorine dosage in the network and possibly bringing further cost savings.
Description
Publisher Copyright: © 2024 The Authors
Keywords
Cost estimation, Environmental impact, Loose nanofiltration, Natural organic matter, Surface water treatment
Other note
Citation
Laurell, P, Sivonen, K, Hesampour, M, Tuutijärvi, T & Vahala, R 2024, ' Application and environmental impact of loose nanofiltration in surface water treatment ', JOURNAL OF WATER PROCESS ENGINEERING, vol. 60, 105174 . https://doi.org/10.1016/j.jwpe.2024.105174