Synergistic effects of unsaturated flow and soil organic matter on retention and transport of PPCPs in soils

Dai, Yuanyuan; Zhuang, Jie; Chen, Xijuan

doi:10.1016/j.envres.2020.110135

Cited by 15 publications

(18 citation statements)

References 46 publications

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“…These relatively high EOC concentrations (1 mg L −1 of each EOC) were required for effective detection and quantification in the column experiments, considering variable removal efficiency. 19 Still, the concentrations of EOCs were in the range of polluted soils irrigated with wastewater. 25 Soil-free control column experiments with the injection of EOCs were performed to determine the abiotic losses of the EOCs due to hydrolysis, volatilization, and adsorption in the experimental system, while soil-packed control column experiments without input of EOCs were carried out to determine the release of the EOCs from soil in the experimental system.…”

Section: Column System and Experimentalmentioning

confidence: 98%

“…The experiments followed a previously reported procedure. 19 Schematics of the saturated and unsaturated column experiments are shown in Figure S1. Specifically, the saturated column system consisted of a stainless steel column (11 cm in length and 5.5 cm in inner diameter), a piston pump (LC-16, Shimadzu Corporation, Kyoto, Japan) connected to the inlet of the column for injecting input solution, and an automated fraction collector (CF2, Spectrum Chemical Mfg.…”

Section: Column System and Experimentalmentioning

confidence: 99%

“…Therefore, no experimental data and numerical simulation are provided in Table 2. The complete removal of these two positively charged EOCs is attributed to their strong electrostatic attraction to the negatively charged soil surfaces (e.g., SWI) 19,22,44 and their recalcitrant nature. 45,46 BPA and IBU were detected in the effluent of columns packed with the OXM2, M1, and M2 soils.…”

Section: Dependence Of Desaturation Effect On Sommentioning

confidence: 99%

“…11 Meanwhile, decreased water content leads to longer flow paths and residence time and increases dispersion and retention. 17 Many studies investigated adsorption and transport of organic contaminants in the vadose zone; 10,18,19 however, it is not clear how AWI and SWI interact to influence the degradation of EOCs.…”

Section: Introductionmentioning

confidence: 99%

“…24 Our previous studies demonstrated that SOM can increase the removal of EOCs, and the removal could be further enhanced by pore water desaturation. 19 Therefore, this study aimed to elucidate the effects of unsaturated flow on the degradation of EOCs during transport through soils with different SOM contents. Based on our previous work studying the adsorption and transport of EOCs in heterogeneous soils, five EOCs with a range of physicochemical properties and environmental behaviors, including bisphenol A (BPA), ibuprofen (IBU), carbamazepine (CBZ), tetracycline (TTC), and ciprofloxacin (CPF), were selected.…”

Section: Introductionmentioning

confidence: 99%

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Hydrobiological Mechanism Controlling the Synergistic Effects of Unsaturated Flow and Soil Organic Matter on the Degradation of Emerging Organic Contaminants in Soils

Chen

Dai

Zhao

et al. 2022

Environ. Sci. Technol.

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Hydrology is a key factor influencing microbial degradation of emerging organic contaminants (EOCs) in soils, but the underlying mechanisms are not clear. In this study, biotic and abiotic column experiments were performed to investigate the removal and degradation of five EOCs in soils with different soil organic matter (SOM) contents under saturated and unsaturated flow conditions. In biotic experiments, 54− 90% of bisphenol A (BPA) and 9−22% of ibuprofen (IBU) were removed from the aqueous phase of saturated columns due to adsorption and biodegradation. The biodegradation removed 26−65% of BPA and 1−22% of IBU. Decreasing soil pore water saturation from 100 to 80% increased BPA removal to 97−100% and IBU removal to 42−43% due to increased biodegradation (67−81% for BPA and 36−39% for IBU). No significant removal of BPA and IBU was observed in SOM-removed soils under saturated and unsaturated flow conditions. The desaturation did not influence sorptive losses of BPA (<27%) and IBU (<7%), suggesting their negligible adsorption at air−water interfaces but increased biodegradation of BPA and IBU sorbed at SOM−water interfaces. The study shows that soil drying and SOM can synergistically degrade BPA and IBU but have no effect on recalcitrant carbamazepine, tetracycline, and ciprofloxacin.

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Section: Column System and Experimentalmentioning

confidence: 98%

Section: Column System and Experimentalmentioning

confidence: 99%

Section: Dependence Of Desaturation Effect On Sommentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrobiological Mechanism Controlling the Synergistic Effects of Unsaturated Flow and Soil Organic Matter on the Degradation of Emerging Organic Contaminants in Soils

Chen

Dai

Zhao

et al. 2022

Environ. Sci. Technol.

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Transport of bisphenol A, bisphenol S, and three bisphenol F isomers in saturated soils

Zi,

Xu,

Zhang

et al. 2023

Environ Sci Pollut Res

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With the limitation of the use of bisphenol A (BPA), the production of its substitutes, bisphenol S (BPS) and bisphenol F (4,4'-BPF) is increasing. Understanding the fate and transport of BPA and its substitutes in porous media can help reduce their risk of contaminating soil and groundwater systems. In this study, column and batch adsorption experiments were performed with 14 C-labeled bisphenol analogs and combined with mathematical models to investigate the interaction of BPA, BPS, 4,4'-BPF, 2,2'-BPF and 2,4'-BPF with four standard soils with different soil organic matter (SOM) contents. The results show that the transport capacity of BPS and 4,4'-BPF in the saturated soils is signi cantly stronger than that of BPA. Meanwhile, the mobility of the three isomers of bisphenol F (2,2'-BPF, 2,4'-BPF and 4,4'-BPF) showed some variability in saturated soils with high SOM content. The two-site kinetic retention mode was applied to simulate and interpret experimental data, and model simulations described the interactions between the bisphenol analogs and soil very well. The tting results show that SOM provides more adsorption sites for bisphenol analogs and these adsorption sites may be irreversible adsorption sites. For the different mobility of bisphenol analogs, hydrophobicity is the main factor leading to the difference in adsorption a nity between BPA, BPS, 4,4'-BPF and soil. The main factor leading to the difference of adsorption a nity between 4,4'-BPF and its isomers (2,2'-BPF and 2,4'-BPF) and soil may be hydrogen bonding force. In addition, the results of this study show that the relatively high mobility of BPA substitutes BPS and 4,4'-BPF may pose a signi cant risk to groundwater quality, so 4,4'-BPF and BPS may not be environmentally friendly alternatives to BPA. In addition, as by-products of 4,4'-BPF production, 2,2'-BPF and 2,4'-BPF have high mobility in soil and may pose a more signi cant threat to groundwater than 4,4'-BPF. HighlightsBPS and 4,4'-BPF has higher mobility than BPA in four standard soils.2,2'-BPF, 2,4'-BPF and 4,4'-BPF have different transport capacities in standard soils.The adsorption a nity of bisphenol analogs to soil is signi cantly correlated with soil organic matter.

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Full-chain analysis on emerging contaminants in soil: Source, migration and remediation

Liu,

et al. 2024

Chemosphere

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Synergistic effects of unsaturated flow and soil organic matter on retention and transport of PPCPs in soils

Cited by 15 publications

References 46 publications

Hydrobiological Mechanism Controlling the Synergistic Effects of Unsaturated Flow and Soil Organic Matter on the Degradation of Emerging Organic Contaminants in Soils

Hydrobiological Mechanism Controlling the Synergistic Effects of Unsaturated Flow and Soil Organic Matter on the Degradation of Emerging Organic Contaminants in Soils

Transport of bisphenol A, bisphenol S, and three bisphenol F isomers in saturated soils

Full-chain analysis on emerging contaminants in soil: Source, migration and remediation

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