Characterisation of groundwater dissolved organic matter using LC-OCD: implications for water treatment

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dc.contributor.authorRutlidge, Hen_AU
dc.contributor.authorMcDonough, LKen_AU
dc.contributor.authorOudone, PPen_AU
dc.contributor.authorAndersen, MSen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorChinu, Ken_AU
dc.contributor.authorPeterson, MAen_AU
dc.contributor.authorBaker, AAen_AU
dc.date.accessioned2022-06-02T23:09:36Zen_AU
dc.date.available2022-06-02T23:09:36Zen_AU
dc.date.issued2021-01-01en_AU
dc.date.statistics2022-06-02en_AU
dc.description.abstractThe polarity and molecular weight of dissolved organic matter (DOM) is an important factor determining the treatability of water for domestic supply. DOM in surface water and groundwater is comprised of a mixture of carbon with varying molecular weight ranges, with its composition driven by DOM sources and processing. Here, we present the largest dataset of chromatographic DOM in surface and groundwater samples (n = 246) using liquid chromatography organic carbon detection (LCsingle bondOCD). Our data represents four categories (surface water, hyporheic zone water, local groundwater, and regional groundwater) from five different sites across Australia. In all environments, high molecular weight hydrophilic DOM such as biopolymers (BP) and humic substances (HS) are present in surface waters and are processed out of groundwater as it moves from surface water and hyporheic zones into shallow local groundwater and deeper regional groundwaters. This results in a higher percentage of low molecular weight neutrals (LMWN) and hydrophobic organic carbon (HOC) in deeper regional groundwaters. Our findings indicate that the presence of sedimentary organic matter strongly influence the character of surface and groundwater DOM, resulting in groundwater with higher HS aromaticity and molecular weight, and reduced percentage of LMWNs. We also observe highly variable hydrophilic / HOC ratios in groundwater at all sites, with 9.60% and 25.64% of samples at sites containing sedimentary peat layers and non-sedimentary peat sites respectively containing only hydrophilic dissolved organic carbon (DOC). We identify average hydrophilic / HOC ratios of 4.35 ± 3.76 and 7.53 ± 5.32 at sites containing sedimentary peat layers and non-sedimentary peat sites respectively where both hydrophilic DOC and HOC are present. Overall our results suggest that fractured rock and alluvial aquifers in sedimentary organic carbon poor environments may contain DOC which is better suited to ozonation, biologically activated carbon filtration powdered activated carbon, suspended ion exchange treatment or magnetic ion exchange resin since DOC is more hydrophilic and of lower molecular weight and lower aromaticity. Aquifers located near sedimentary organic matter layers may benefit from pre-treatment by coagulation/flocculation, sedimentation and sand filtration which have high removal efficiency for high molecular weight and polar compounds. © 2021 Elsevier Ltd.en_AU
dc.identifier.articlenumber116422en_AU
dc.identifier.citationRutlidge, H., McDonough, L. K., Oudone, P., Andersen, M. S., Meredith, K., Chinu, K., Peterson, M., & Baker, A. (2021). Characterisation of groundwater dissolved organic matter using LC-OCD: implications for water treatment. Water Research, 188, 116422. doi:10.1016/j.watres.2020.116422en_AU
dc.identifier.issn0043-1354en_AU
dc.identifier.journaltitleWater Researchen_AU
dc.identifier.urihttps://doi.org/10.1016/j.watres.2020.116422en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13270en_AU
dc.identifier.volume188en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectGround wateren_AU
dc.subjectOrganic matteren_AU
dc.subjectWater treatmenten_AU
dc.subjectAquifersen_AU
dc.subjectCarbonen_AU
dc.subjectChromatographyen_AU
dc.titleCharacterisation of groundwater dissolved organic matter using LC-OCD: implications for water treatmenten_AU
dc.typeJournal Articleen_AU
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