On the localization of chemical reactions in multicontinuum media

Wang, Jingjing; Carrera, Jesús; Saaltink, Maarten W.; Valhondo, Cristina

doi:10.1016/j.advwatres.2022.104286

Cited by 3 publications

(5 citation statements)

References 55 publications

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“…For example, 4HB, which had not been detected in the inflow and had similar solid affinity as BP-3 and the other TPs (see Table 1 ), displays a high accumulation (its distribution coefficient had to be increased to match observations) and is the last derivative produced along the transformation processes of the BP-3. This shows that the imbalance between its degradation, production, and exchange with the mobile phase is responsible for its retention in biofilm, which is consistent with the findings of Wang et al 35 Interestingly, 4HB was not initially present in the biofilm samples and at very low concentration in the sediments ones.…”

Section: Resultssupporting

confidence: 91%

“…Furthermore, positive surfaces have been described inside biofilms. 35 AVO was detected in most of the biofilm samples from both systems and at similar concentrations (Table 2). AVO is not a transformation product of BP-3; thus, its accumulation in biofilm is explained by its high affinity to the organic phase in the biofilm (log K ow = 4.51) and slow degradability.…”

Section: Retention Of Uvfs In Immobilementioning

confidence: 69%

“…Chang et al described an interaction between Mn oxides and BP-4. Furthermore, positive surfaces have been described inside biofilms …”

Section: Resultsmentioning

confidence: 99%

“…The fate of UVFs and most pollutants in porous media is mostly controlled by advection/mixing-dispersion and by sorption and degradation processes. Inside the biofilm, the most important processes are the different retention mechanisms, diffusion, as well as degradation 35 ( Figure 2 a).…”

Section: Methodsmentioning

confidence: 99%

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Assessing the Fate of Benzophenone-Type UV Filters and Transformation Products during Soil Aquifer Treatment: The Biofilm Compartment as Bioaccumulator and Biodegrader in Porous Media

Jou-Claus,

Rodríguez-Escales,

Martínez-Landa

et al. 2024

Environ. Sci. Technol.

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The fate of selected UV filters (UVFs) was investigated in two soil aquifer treatment (SAT) systems, one supplemented with a reactive barrier containing clay and vegetable compost and the other as a traditional SAT reference system. We monitored benzophenone-3 (BP-3) and its transformation products (TPs), including benzophenone-1 (BP-1), 4,4′dihydroxybenzophenone (4DHB), 4-hydroxybenzophenone (4HB), and 2,2′-dihydroxy-4-methoxybenzophenone (DHMB), along with benzophenone-4 (BP-4) and avobenzone (AVO) in all involved compartments (water, aquifer sediments, and biofilm). The reactive barrier, which enhances biochemical activity and biofilm development, improved the removal of all detected UVFs in water samples. Among monitored UVFs, only 4HB, BP-4, and AVO were detected in sediment and biofilm samples. But the overall retained amounts were several orders of magnitude larger than those dissolved. These amounts were quantitatively reproduced with a specifically developed simple analytical model that consists of a mobile compartment and an immobile compartment. Retention and degradation are restricted to the immobile water compartment, where biofilm absorption was simulated with well-known compound-specific K ow values. The fact that the model reproduced observations, including metabolites detected in the biofilm but not in the (mobile) water samples, supports its validity. The results imply that accumulation ensures significant biodegradation even if the degradation rates are very low and suggest that our experimental findings for UVFs and TPs can be extended to other hydrophobic compounds. Biofilms act as accumulators and biodegraders of hydrophobic compounds.

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Section: Resultssupporting

confidence: 91%

Section: Retention Of Uvfs In Immobilementioning

confidence: 69%

“…Chang et al described an interaction between Mn oxides and BP-4. Furthermore, positive surfaces have been described inside biofilms …”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Assessing the Fate of Benzophenone-Type UV Filters and Transformation Products during Soil Aquifer Treatment: The Biofilm Compartment as Bioaccumulator and Biodegrader in Porous Media

Jou-Claus,

Rodríguez-Escales,

Martínez-Landa

et al. 2024

Environ. Sci. Technol.

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“…In addition, the inclusion of biochar, compost, and specially woodchip in reactive barriers could increase the retention of anionic molecules such as SMX that are included in the surface water watchlist of the European Commission since they might pose a significant risk for the aquatic environment [15]. Furthermore, by including different materials and increasing the sorption surfaces, the distribution of the residence times in immobile zones is broadened, which has been associated with the localization of biogeochemical reactions that favors PhACs biodegradation [63].…”

Section: What Materials Should Be Included In Reactive Barriers To Bo...mentioning

confidence: 99%

Assessing the Feasibility of Sustainable Materials to Boost the Sorption of Pharmaceutical Active Compounds When Included in Reactive Barriers in Soil Aquifer Treatment for Water Reuse

Valhondo

Duporté

Cabaret

et al. 2023

Water

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We evaluated the feasibility of five sustainable materials (clay, zeolite, biochar, compost, and woodchips) to be included in a reactive barrier intended to improve the removal of pharmaceutical active compounds (PhACs) during soil aquifer treatment (SAT). The potential of the five materials to sorb PhACs was assessed and compared to sand capacity through batch experiments. Materials with high organic carbon content (biochar, compost, and woodchips) exhibited a greater capacity to sorb PhACs than materials with a low organic carbon content (clay and zeolite). The ion speciation of the molecules is a major parameter controlling the fate and transport of PhACs during SAT operations. Anionic species are the ones with the highest risk of reaching the aquifer since they are generally less sorbed compared to cationic and neutral species. Experimental parameters such as contact time, solid:water ratio, and grain size had no a significant effect on the sorption of PhACs in the studied materials. The incorporation of biochar, compost, and/or woodchips into reactive barriers will promote the sorption of PhACs and will boost the ability of the SAT system to improve the quality of the recharged water.

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