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Zou H, He J, Chu Y, Xu B, Li W, Huang S, Guan X, Liu F, Li H. Revealing discrepancies and drivers in the impact of lomefloxacin on groundwater denitrification throughout microbial community growth and succession. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133139. [PMID: 38056273 DOI: 10.1016/j.jhazmat.2023.133139] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 10/31/2023] [Accepted: 11/28/2023] [Indexed: 12/08/2023]
Abstract
The coexistence of antibiotics and nitrates has raised great concern about antibiotic's impact on denitrification. However, conflicting results in these studies are very puzzling, possibly due to differences in microbial succession stages. This study investigated the effects of the high-priority urgent antibiotic, lomefloxacin (LOM), on groundwater denitrification throughout microbial growth and succession. The results demonstrated that LOM's impact on denitrification varied significantly across three successional stages, with the most pronounced effects exhibited in the initial stage (53.8% promotion at 100 ng/L-LOM, 84.6% inhibition at 100 μg/L-LOM), followed by the decline stage (13.3-18.2% inhibition), while no effect in the stable stage. Hence, a distinct pattern encompassing susceptibility, insusceptibility, and sub-susceptibility in LOM's impact on denitrification was discovered. Microbial metabolism and environment variation drove the pattern, with bacterial numbers and antibiotic resistance as primary influencers (22.5% and 15.3%, p < 0.01), followed by carbon metabolism and microbial community (5.0% and 3.68%, p < 0.01). The structural equation model confirmed results reliability. Bacterial numbers and resistance influenced susceptibility by regulating compensation and bacteriostasis, while carbon metabolism and microbial community impacted energy, electron transfer, and gene composition. These findings provide valuable insights into the complex interplay between antibiotics and denitrification patterns in groundwater.
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Affiliation(s)
- Hua Zou
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Jiangtao He
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China.
| | - Yanjia Chu
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Baoshi Xu
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Wei Li
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Shiwen Huang
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Xiangyu Guan
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
| | - Fei Liu
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Haiyan Li
- School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
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Feng C, Liu F, Bi E. Control mechanism of trichloroethylene back diffusion by microstructure in a low permeability zone. JOURNAL OF HAZARDOUS MATERIALS 2024; 466:133593. [PMID: 38280322 DOI: 10.1016/j.jhazmat.2024.133593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/19/2024] [Accepted: 01/20/2024] [Indexed: 01/29/2024]
Abstract
The trailing effect caused by the back diffusion (BD) of contaminants in low-permeability zones (LPZs), which prolongs remediation time and increases remediation costs, has caused widespread concern. In this study, the BD of trichloroethylene (TCE) from the LPZ to the high-permeability zone (HPZ) was determined using flow cell experiments. The anomalous variance in the BD flux of the TCE-spanning 2-4 times the deviation under identical experimental conditions, attracted our attention. To determine the cause of this aberrant behavior, a micro computed tomography (micro-CT) characterization of the flow cell was conducted, which revealed significant microstructural disparities in the LPZ. The study found that the pore connectivity of LPZs determines the efficiency of BD and that LPZs with different porosities have different sensitivities to connectivity. The pore shape complexity indicates the possibility of BD retardation, and remediation is more difficult for these types of LPZs. Changing the structure of LPZs to improve their remediation efficiency may be a new research topic. Notably, correcting the model parameters through microstructural characterization significantly refined the prediction accuracy.
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Affiliation(s)
- Chen Feng
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China; Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Fei Liu
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China; Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China.
| | - Erping Bi
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, PR China; Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China
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He B, He J, Bi E, Zou H, Liu T, Liu Z. Transport and retention of nano emulsified vegetable oil in porous media: Effect of pore straining, roughness wedging, and interfacial effects. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 320:115912. [PMID: 35944327 DOI: 10.1016/j.jenvman.2022.115912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 07/19/2022] [Accepted: 07/29/2022] [Indexed: 06/15/2023]
Abstract
Emulsified vegetable oil (EVO), as one of the novel green substrates, has been widely used in subsurface remediation. In these applications, the retention behavior of EVO presents a challenge to remediation efficiency as mechanism insights into the retention of EVO is limited. Herein, Brinell funnels experiments with X-ray microtomography (XMT) were conducted to examine the drainage and retention of nanoscale EVO in porous media, with a specific focus on investigating the impact of pore straining, grain surface roughness, and interfacial effects on Nano-EVO (NEVO) retention. This study demonstrated that the retention of NEVO in porous media is the synergistic result of pore straining, roughness wedging, and interface attachment. With the action of these effects, three residual states of NEVO, incorporating retention at porous ganglia, grain-grain contacts, and grain surface, were identified by XMT in porous media. After multiple periods of drainage and imbibition, the NEVO arrived at stable retention proportions of 46.3%, 72.2%, and 85.9% in three independent systems with coarse, medium, and fine sand as porous media, respectively. The interfacial effects, including the attachment of solid-phase and air-liquid interface, are confirmed as the dominant factors for the retention of NEVO in porous media, which contributed 35.63-47.33% of total retention for the conditions employed. Correspondingly, the contributions of pore straining and roughness wedging only ranged 3.78-24.06% and 3.87-9.94%, respectively. The consistency of the contributions between the actual measurement of XMT and computational evaluation further confirmed the rationality and reliability of the results. In such the dominant factor, interfacial tension, contact angle, and capillary radius play an essential role in NEVO retention, which could be reflected by capillary rise height. These findings advance our understanding on NEVO retention caused by substrate-media interaction and also offer a promising direction for subsurface remediation.
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Affiliation(s)
- Baonan He
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing, 100083, PR China.
| | - Jiangtao He
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing, 100083, PR China.
| | - Erping Bi
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR China; Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing, 100083, PR China
| | - Hua Zou
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR China
| | - Tao Liu
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR China
| | - Zirong Liu
- School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, PR China
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Zou H, He J, Guan X, Zhang Y, Deng L, Li Y, Liu F. Microbial responses underlying the denitrification kinetic shifting exposed to ng/L- and μg/L-level lomefloxacin in groundwater. JOURNAL OF HAZARDOUS MATERIALS 2021; 417:126093. [PMID: 34229389 DOI: 10.1016/j.jhazmat.2021.126093] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 04/15/2021] [Accepted: 05/10/2021] [Indexed: 06/13/2023]
Abstract
The emerging co-contaminant of antibiotics and nitrate has acquired great concerns worldwide, which poses a potential impact on denitrification in the ecological environment, but little is known about the groundwater system at lower antibiotic concentration, especially ng/L-level. Herein the frequently detected Lomefloxacin (LOM) in groundwater was selected to explore its influences on denitrification kinetics and microbial dynamic responses. The NO3--N removals in ng/L-μg/L LOM-amended reactors (8.7-44.9%) performed far lower than that in control (76.1%). LOM can inhibit denitrification even at ng/L-level. The kinetic characteristic shifted from zero- to first-order once inhibition occurred. This observation is the synergistic effects of microbial community, enzyme activity, and antibiotic resistance genes (ARGs). The enzyme activities were inhibited immediately, whereas microbial community and ARGs exhibited hysteresis responses at ng/L-level. The enrichment of non-corresponding ARG types suggested LOM's co-selection effects. Brevundimonas were potential antibiotic resistant bacteria. Exposed to μg/L-level LOM, denitrification underwent a 6-d lag phase. The more sensitive enzyme activities and microbial community and the enrichment of ARGs with less abundance were investigated. These findings clarify the microbial response mechanism underlying the denitrification kinetic shifting exposed to low-concentrations of LOM, which is the potential process for heightening nitrate accumulation in groundwater.
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Affiliation(s)
- Hua Zou
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, PR China; Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Jiangtao He
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, PR China; Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China.
| | - Xiangyu Guan
- Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China; School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Yuye Zhang
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, PR China; Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Lu Deng
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, PR China; Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Yiqiang Li
- School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, PR China
| | - Fei Liu
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, PR China; Beijing Key Laboratory of Water Resources and Environmental Engineering, China University of Geosciences (Beijing), Beijing 100083, PR China
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Chang B, Du C, Sun M, Lin Y, Wang Y, Chu X, Zhang L, He J. Mesoscopic Seepage Simulation and Analysis of Unclassified Tailings Pores Based on 3D Reconstruction Technology. ACS OMEGA 2021; 6:14309-14316. [PMID: 34124454 PMCID: PMC8190888 DOI: 10.1021/acsomega.1c01092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 05/12/2021] [Indexed: 06/12/2023]
Abstract
Taking the unclassified tailings as the research object, the three-dimensional (3D) pore model was established using computed tomography (CT) scanning technology, image processing, and the 3D reconstruction method. The model was imported into Flac3D software for mesoscopic seepage simulation and analysis. Combined with the laboratory seepage experiment, the influence of tailings' mesoscopic parameters on permeability was explored. The results show that there is a high correlation between the fractal dimension and fragmentation index of tailings pores and the mesoscopic seepage coefficient, with correlation coefficients of 0.987 and 0.973, respectively. When the porosity difference of the pore model is small, the permeability is mainly affected by pore connectivity. The mathematical model between the permeability coefficient and the fragmentation index of tailings is established. The average error between the permeability coefficient calculated by the model and the measured value is reduced to 4.98%, which proves that the mathematical model has guaranteed reliability.
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Affiliation(s)
- Baomeng Chang
- School
of Civil & Resources Engineering, University
of Science & Technology Beijing, Beijing 100083, China
- State
Key Laboratory of High-Efficient Mining and Safety of Metal Mines
of Ministry of Education, University of
Science and Technology Beijing, Beijing 100083, China
| | - Cuifeng Du
- School
of Civil & Resources Engineering, University
of Science & Technology Beijing, Beijing 100083, China
- State
Key Laboratory of High-Efficient Mining and Safety of Metal Mines
of Ministry of Education, University of
Science and Technology Beijing, Beijing 100083, China
| | - Mingkang Sun
- School
of Civil & Resources Engineering, University
of Science & Technology Beijing, Beijing 100083, China
- State
Key Laboratory of High-Efficient Mining and Safety of Metal Mines
of Ministry of Education, University of
Science and Technology Beijing, Beijing 100083, China
| | - Yifan Lin
- School
of Civil & Resources Engineering, University
of Science & Technology Beijing, Beijing 100083, China
- State
Key Laboratory of High-Efficient Mining and Safety of Metal Mines
of Ministry of Education, University of
Science and Technology Beijing, Beijing 100083, China
| | - Yuan Wang
- School
of Civil & Resources Engineering, University
of Science & Technology Beijing, Beijing 100083, China
- State
Key Laboratory of High-Efficient Mining and Safety of Metal Mines
of Ministry of Education, University of
Science and Technology Beijing, Beijing 100083, China
| | - Xiaofeng Chu
- Jiaojia
Gold Mine, Shandong Gold Mining (Laizhou) Co., Ltd, Yantai 264010, China
| | - Long Zhang
- Jiaojia
Gold Mine, Shandong Gold Mining (Laizhou) Co., Ltd, Yantai 264010, China
| | - Jiaqing He
- New
Metallurgy Hi-Tech Group, China Iron and
Steel Research Institute, Beijing 100081, China
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