Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Molecular Response of Dissolved Organic Matter in Aquifer to Landfill Leachate Leakage
https://orcid.org/0000-0002-3671-8650
https://orcid.org/0000-0001-7447-4848
This study investigated changes in groundwater dissolved organic matter (DOM) composition resulting from leachate leakage and examined the causes of these changes by simulating the contamination process through soil column and adsorption experiments. The results showed that contaminated groundwater had higher humification degree, chemical diversity, and unsaturation of DOM compared to uncontaminated groundwater. Five fractions were identified in landfill leachate, with fulvic-like acid and building blocks of humic substance fractions (0.45–2.5 kDa) being poorly retained by soil upon leakage. In contrast, high-molecular humic-like acid and biopolymer fractions (>2.5 kDa) as well as low-molecular organic fractions (<0.45 kDa) were readily adsorbed in soil, leading to the appearance and intensification of characteristic fluorophores at excitation/emission wavelengths of 250, 310, 365 nm/460 nm in contaminated groundwater. The characteristic fluorophore representative molecules comprised highly unsaturated structures with low- and high-oxygen content (79.6%) with high oxidizability, aromaticity, and unsaturation. To the best of our knowledge, this was the first report of the medium-molecular-weight organics in leachate preferentially entering groundwater rather than the low-molecular weight organics. This study facilitates to deepen the understanding of groundwater contamination by leachate leakage and provides theoretical support for early warning of leachate leakage contamination.
Organic matter with medium molecular weight, ranging between 0.45 and 2.5 kDa in leachate, was more likely to infiltrate groundwater compared to low-molecular-weight organic matter (<0.45 kDa).
Molecular Response of Dissolved Organic Matter in Aquifer to Landfill Leachate Leakage
https://orcid.org/0000-0002-3671-8650
https://orcid.org/0000-0001-7447-4848
This study investigated changes in groundwater dissolved organic matter (DOM) composition resulting from leachate leakage and examined the causes of these changes by simulating the contamination process through soil column and adsorption experiments. The results showed that contaminated groundwater had higher humification degree, chemical diversity, and unsaturation of DOM compared to uncontaminated groundwater. Five fractions were identified in landfill leachate, with fulvic-like acid and building blocks of humic substance fractions (0.45–2.5 kDa) being poorly retained by soil upon leakage. In contrast, high-molecular humic-like acid and biopolymer fractions (>2.5 kDa) as well as low-molecular organic fractions (<0.45 kDa) were readily adsorbed in soil, leading to the appearance and intensification of characteristic fluorophores at excitation/emission wavelengths of 250, 310, 365 nm/460 nm in contaminated groundwater. The characteristic fluorophore representative molecules comprised highly unsaturated structures with low- and high-oxygen content (79.6%) with high oxidizability, aromaticity, and unsaturation. To the best of our knowledge, this was the first report of the medium-molecular-weight organics in leachate preferentially entering groundwater rather than the low-molecular weight organics. This study facilitates to deepen the understanding of groundwater contamination by leachate leakage and provides theoretical support for early warning of leachate leakage contamination.
Organic matter with medium molecular weight, ranging between 0.45 and 2.5 kDa in leachate, was more likely to infiltrate groundwater compared to low-molecular-weight organic matter (<0.45 kDa).
Molecular Response of Dissolved Organic Matter in Aquifer to Landfill Leachate Leakage
https://orcid.org/0000-0002-3671-8650
https://orcid.org/0000-0001-7447-4848
This study investigated changes in groundwater dissolved organic matter (DOM) composition resulting from leachate leakage and examined the causes of these changes by simulating the contamination process through soil column and adsorption experiments. The results showed that contaminated groundwater had higher humification degree, chemical diversity, and unsaturation of DOM compared to uncontaminated groundwater. Five fractions were identified in landfill leachate, with fulvic-like acid and building blocks of humic substance fractions (0.45–2.5 kDa) being poorly retained by soil upon leakage. In contrast, high-molecular humic-like acid and biopolymer fractions (>2.5 kDa) as well as low-molecular organic fractions (<0.45 kDa) were readily adsorbed in soil, leading to the appearance and intensification of characteristic fluorophores at excitation/emission wavelengths of 250, 310, 365 nm/460 nm in contaminated groundwater. The characteristic fluorophore representative molecules comprised highly unsaturated structures with low- and high-oxygen content (79.6%) with high oxidizability, aromaticity, and unsaturation. To the best of our knowledge, this was the first report of the medium-molecular-weight organics in leachate preferentially entering groundwater rather than the low-molecular weight organics. This study facilitates to deepen the understanding of groundwater contamination by leachate leakage and provides theoretical support for early warning of leachate leakage contamination.
Organic matter with medium molecular weight, ranging between 0.45 and 2.5 kDa in leachate, was more likely to infiltrate groundwater compared to low-molecular-weight organic matter (<0.45 kDa).
Molecular Response of Dissolved Organic Matter in Aquifer to Landfill Leachate Leakage
Wang, Xian-Ge (Autor:in) / He, Wei (Autor:in) / Zeng, Xian-Jiang (Autor:in) / Cao, Xu (Autor:in) / Liu, Qing-Yu (Autor:in) / He, Xiao-Song (Autor:in)
ACS ES&T Water ; 4 ; 3931-3942
13.09.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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