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Hybrid hollow fiber nanofiltration-calcite contactor: A novel point-of-entry treatment for removal of dissolved Mn, Fe, NOM and hardness from domestic groundwater supplies

Maryam Haddad and Benoit Barbeau

Article (2019)

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Cite this document: Haddad, M. & Barbeau, B. (2019). Hybrid hollow fiber nanofiltration-calcite contactor: A novel point-of-entry treatment for removal of dissolved Mn, Fe, NOM and hardness from domestic groundwater supplies. Membranes, 9(7). doi:10.3390/membranes9070090
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Abstract

Groundwater (GW) is one of the main potable water sources worldwide. However, the presence of undesirable compounds and particularly manganese (Mn) and iron (Fe) (mainly co-existing in GWs) are considered as objectionable components of potable water for both health and aesthetic issues. As such, individual dwellings supplied by domestic wells are especially threatened by these issues. Current domestic treatment technologies are complicated to operate and even dangerous if improperly maintained (e.g., catalytic filtration) or consume salts and produce spent brine which pollutes the environment (i.e., ion exchange resins). Therefore, it is of prime importance to design a simple and compact, yet robust, system for Mn and Fe control of the domestic GW sources, which can reliably guarantee the desired Mn limit in the finished water ( 20 mu g/L). In the course of this study, we demonstrated, for the first time, that a hybrid hollow fiber nanofiltration (HFNF)-calcite contactor process is a promising alternative for treating domestic GWs with elevated levels of Mn, Fe, natural organic matter (NOM) and hardness. The efficacy of the HFNF membranes in terms of removal of Mn, Fe and NOM and fouling was compared with commercially available NF270 and NF90 membranes. The results revealed that HFNF (100-200 Da) and NF90 maintained considerably high rejection of Mn, Fe and NOM due to their dominant sieving effect. In contrary, the rejections of the above-mentioned components were decreased in the presence of high hardness for the looser HFNF (200-300 Da) and NF270 membranes. No membrane fouling was detected and the permeate flux was stable when the hard GW was filtered with the HFNF membranes, regardless of their molecular weight cut-off and transmembrane pressure, while the permeability of the NF270 and NF90 membranes steadily decline during the filtration. Integrating a calcite contactor, as a post filtration step, to the HFNF process yielded further Mn, Fe and NOM removals from the HFNF permeate and adjustment of its hardness level. The best performance was achieved when a blend of Calcite-CorosexTM ( 90 / 10 wt . % ) was used as a post-treatment to the tight HFNF (100-200 Da).

Uncontrolled Keywords

NF270 and NF90 membranes; calcite contactor; hard groundwater; hollow fiber nanofiltration; iron and natural organic matter removal; manganese

Open Access document in PolyPublie
Subjects: 1000 Génie civil > 1007 Ressources et approvisionnement en eau
1500 Génie de l'environnement > 1500 Génie de l'environnement
1500 Génie de l'environnement > 1501 Qualité de l'eau, pollution
Department: Département des génies civil, géologique et des mines
Research Center: CIEP - Chaire industrielle en eau potable
Funders: CRSNG/NSERC
Grant number: 312139
Date Deposited: 08 Apr 2022 11:21
Last Modified: 09 Apr 2022 01:20
PolyPublie URL: https://publications.polymtl.ca/4919/
Document issued by the official publisher
Journal Title: Membranes (vol. 9, no. 7)
Publisher: MDPI
Official URL: https://doi.org/10.3390/membranes9070090

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