Groundwater contaminated with short-chain chlorinated paraffins and microbial responses

Wu, Yingxin; Wu, Jiahui; Wu, Zhuohao; Zhou, Jingyan; Zhou, Lingli; Lü, Yang; Liu, Xiaowen; Wu, Wencheng

doi:10.1016/j.watres.2021.117605

Cited by 24 publications

(2 citation statements)

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“…More extensive research into CPs has been prompted by their widespread usage, diffusive release to the environment, and potential toxic risk to humans and ecosystems. The mounting evidence has suggested the widespread occurrence of CPs in wastewater, − inland surface water, , and groundwater . Concerningly, CPs concentrations are generally comparable to or higher than the other POPs, such as brominated flame retardants and polychlorinated biphenyls in environmental matrices. ,, Furthermore, model predictions and field observations have shown of CPs persistence and long-range transportation by dry or wet precipitation, river input and ocean currents in the environment, suggesting their essential roles in transporting CPs from terrestrial sources to the ocean. ,, …”

Section: Introductionmentioning

confidence: 99%

Chlorinated Paraffin Pollution in the Marine Environment

Lyu,

Zhang

2023

Environ. Sci. Technol.

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Chlorinated paraffins (CPs) are ubiquitous in the environment due to their large-scale usage, persistence, and long-range atmospheric transport. The oceans are a critical environment where CPs transformation occurs. However, the broad impacts of CPs on the marine environment remain unclear. This review describes the sources, occurrence and transport pathways, environmental processes, and ecological effects of CPs in the marine environment. CPs are distributed in the global marine environment by riverine input, ocean currents, and long-range atmospheric transport from industrial areas. Environmental processes, such as the deposition of particle-bound compounds, leaching of plastics, and microbial degradation of CPs, are the critical drivers for regulating CPs’ fate in water columns or sediment. Bioaccumulation and trophic transfer of CPs in marine food webs may threaten marine ecosystem functions. To elucidate the biogeochemical processes and environmental impacts of CPs in marine environments, future work should clarify the burden and transformation process of CPs and reveal their ecological effects. The results would help readers clarify the current research status and future research directions of CPs in the marine environment and provide the scientific basis and theoretical foundations for the government to assess marine ecological risks of CPs and to make policies for pollution prevention and control.

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Section: Introductionmentioning

confidence: 99%

Chlorinated Paraffin Pollution in the Marine Environment

Lyu,

Zhang

2023

Environ. Sci. Technol.

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“…71 For the dechlorinating bacterium Dechloromonas, its co-occurring genera in Sphingomonadaceae and Burkholderiaceae can degrade phenanthrene into simple organic matter as a substrate 72 or produce biological surfactants, 73 that can support degraders in mutualism. Other co-occurring Pseudogulbenkiania was reported to be dominant with Dechloromonas in a chlorinated paraffins contaminated groundwater plume, 74 which was identified as core microbiomes in this study, and Lysobacter exhibited a greater relative abundance in chlorinated systems. 75 The bioaugmented CB1190 co-existed with Hydrogenophaga, which was enriched as a supportive genus in the consortium to degrade tetrahydrofuran, 76 a structurally analogous cyclic ether to 1,4-dioxane.…”

Section: Discussionmentioning

confidence: 99%

Investigating Biodegradation of 1,4-Dioxane by Groundwater and Soil Microbiomes: Insights into Microbial Ecology and Process Prediction

Miao,

Zhou,

Zheng

et al. 2023

ACS EST Water

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Although microorganisms play significant roles in bioremediation, their contributions to long-term site characteristics during and after active treatment need to be fully elucidated. This study described microbial ecology dynamics in 1,4-dioxane- and chlorinated solvents-contaminated groundwater in laboratory microcosms. Bioaugmented Pseudonocardia dioxanivorans CB1190 improved 1,4-dioxane removal, with increased carbohydrate and amino acid metabolism, but was eventually outcompeted by native microbes. The original microbiomes were perturbed and divergent but tended to be similar over time. Dechlorinating bacteria co-existed in the same niche, whereas CB1190 had more negative interactions in the shared niche. Multiple regression and classification machine learning models were built by using microbial taxa to predict the degradation process; the ensemble regression model provided most accurate prediction of 1,4-dioxane concentrations (R 2 = 0.81 ± 0.17). Among the classification models, the support vector machine performed the best in differentiating the contamination levels (accuracy at 0.67 ± 0.07, kappa at 0.56 ± 0.10). The ensemble model predicted the 1,4-dioxane concentrations and relative duration of contamination with independent microbial datasets from a field study, and the results aligned with the geographic and hydrological information from monitoring wells. This study introduces the application of machine learning in microbiome-based diagnostics for groundwater remediation and evaluation, providing valuable methods for future research and practice.

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