Sustainability
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2023
·Vol. 15
·期 15
·12057
·
IF 3.9
Won-Kyu Kim,Hanbai Park,Kazuei Ishii,Geun-Yong Ham
Microplastics can cause physical, chemical, biological, and structural problems in soil. In this study, microplastics were identified in the soil near two landfills where contamination by microplastics was expected. Pretreatment was performed to remove organic matter and to separate microplastics from the soil samples. FT-IR microscope analysis was performed to confirm the quantity and types of microplastics. The colors and shapes of microplastics in the soil were analyzed using a digital microscope. Averages of 73.4 MPs(ea)/kg and 97.8 MPs(ea)/kg of microplastics were identified in the soil at the two landfills. The main shapes of microplastics were fragments, fibers, and films, and it was confirmed that secondary plastics were found at a high rate. The major plastic types were identified as PP and PE, ranging from 62.5 to 65.3% in proportion, followed by PET, PS, nylon, PMMA, and PVC. As for the colors of microplastics, black had the highest percentage, while other microplastics were identified as being white, blue, transparent, gray, green, red, and yellow. These results can be taken as important data indicating that microplastics in the soil around landfills can be affected by landfill waste.Keywords:microplastics;soil;landfill;FT-IR;shape;color;composition
研究领域:
环境科学
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生态学
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产品关联
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Wu Dong,Chen Guanzhou,Zhang Xiaojun,Yang Kai,Xie Bing
In this study, the addition of sulfamethazine (SMT) to landfill refuse decreased nitrogen intermediates (e.g. N 2 O and NO) and dinitrogen (N 2 ) gas fluxes to <0.5 μg-N/kg-refuse·h −1 , while the N 2 O and N 2 flux were at ~1.5 and 5.0 μg-N/kg-refuse·h −1 respectively in samples to which oxytetracycline (OTC) had been added. The ARG (antibiotic resistance gene) levels in the refuse increased tenfold after long-term exposure to antibiotics, followed by a fourfold increase in the N 2 flux, but SMT-amended samples with the largest resistome facilitated the denitrification (the nitrogen accumulated as NO gas at ~6 μg-N/kg-refuse·h −1 ) to a lesser extent than OTC-amended samples. Further, deep sequencing results show that long-term OTC exposure partially substituted Hyphomicrobium, Fulvivirga , and Caldilinea (>5%) for the dominant bacterial hosts ( Rhodothermus , ~20%) harboring nosZ and norB genes that significantly correlated with nitrogen emission pattern, while sulfamethazine amendment completely reduced the relative abundance of the “original inhabitants” functioning to produce NO x gas reduction. The main ARG carriers ( Pseudomonas ) that were substantially enriched in the SMT group had lower levels of denitrifying functional genes, which could imply that denitrification is influenced more by bacterial dynamics than by abundance of ARGs under antibiotic pressures.
研究领域:
环境科学
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微生物学
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生态学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2020
·
IF 4.872
Xiaoyu Li,Wenchuan Ding,Siying Tan,Xiaolan Zeng
As the presence of nanosized zinc oxide particles (nano-ZnO) in landfill leachate increases, their interaction with coexisting heavy metal ions (HMs) also increases. The interface interaction between nano-ZnO and HMs will influence nano-ZnO stability and therefore affect its bioavailability and environmental impact. In the present study, we investigated the effects of Cu(II), Cr(III), and Cr(VI) ions on the aggregation, sedimentation, and dissolution of nano-ZnO using batch experiments with a view to better understanding their co-effect on the environment. Dynamic light scattering and UV–Vis spectroscopy results show enhanced aggregation of nano-ZnO in the presence of Cr(VI) ions under fresh landfill leachate conditions, in addition to distinct sedimentation of nano-ZnO in the presence of Cr(III) ions in both fresh and aged landfill leachate. In fresh leachate, Cu(II) ions improved the concentration of dissolved Zn from nano-ZnO. However, the effects of Cu(II), Cr(III), and Cr(VI) ions on the aggregation and dissolution of nano-ZnO were markedly reduced in aged landfill leachate. Both acetic and humic acids in landfill leachate significantly affected the stability of nano-ZnO in the presence of HMs. According to the ATR-FTIR results, Cr(III) ions reacted with hydroxyl groups on nano-ZnO to form ZnO–O bonds, which induced chains of nano-ZnO and Cr(III) complexes, and hence the increased of nano-ZnO aggregates. ATR-FTIR shows merely electrostatic adsorption effects between nano-ZnO and Cu(II) or Cr(VI) ions. In brief, the mode of interactions between HMs and nano-ZnO influenced the stability via adsorption and binding effects. The results of the present research provide insight into the potential effects of nano-ZnO on the environment in the presence of HMs in landfill leachate.
研究领域:
环境科学
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纳米生物学
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产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
He Shichong,Zhu Lizhong
Sorptive landfill liners can prevent the migration of the leachate pollutants. However, their sorption ability will decrease over time. A method should be developed to maintain the sorption ability of landfill liners. In this study, we combined cetyltrimethylammonium bromide-bentonite (CTMAB-bentonite) and zero-valent iron (ZVI) to develop a self-cleaning liner that can retain its sorption ability for a long period. Batch experiments and calculation simulations were employed to analyse the sorption ability of this liner material and the ecological risk of halogenated hydrocarbons. The results showed that CTMAB-bentonite could sorb halogenated hydrocarbons well, with saturated sorption capacities ( Q
m ) of 10.2, 14.5, 6.69, 18.5, 29.4, and 49.7 mg·g -1 for dichloroethane (DCA), trichloroethane (TCA), dichloroethene (DCE), trichloroethylene (TCE), tetrachloroethylene (PCE), and 1,3- dichloropropene (1,3-DCP), respectively. Using the mixture of 0.5 g iron and 0.5 g CTMAB-bentonite could dramatically increase the removal efficiency of DCE, TCE, and PCE. The reaction with ZVI did not change the structure of CTMAB-bentonite and its sorption ability remained consistent. Calculation results suggested that the self-cleaning landfill liner would dramatically decrease the hazard index (HI) of the eluate. However, the humic acid and salt in leachate would cause a reduction in the removal of halogenated hydrocarbons.
研究领域:
环境科学
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污染控制
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
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2020
·
IF 6.793
Yinglong Su,Zhongjian Zhang,Jundong Zhu,Jianhong Shi,Huawei Wei,Bing Xie,Huahong Shi
Microplastics (MPs) are found to be ubiquitous and serve as vectors for other contaminants, and the inevitable aging process changes MP properties and fates. However, whether the MPs in aging process affects the fates of antibiotic resistance gene (ARGs) in aquatic environments is poorly understood. Herein, the physicochemical property alteration of MPs being aged in landfill leachate , an important reservoir of MPs and ARGs, was investigated, and microbial community evolution and ARGs occurrence of MP surface during the aging process were analyzed. Aging process remarkably altered surface properties, including increasing specific surface areas, causing the formation of oxygen-containing groups, and changing surface morphology, which further increased the probability of microbial colonization. The bacterial assemblage on MPs showed higher biofilm-forming and pathogenic potential compared to leachate. ARGs quantification results suggested that MPs exhibited selective enrichment for ARGs in a ratio of 5.7–10 3 folds, and the aging process enhanced the enrichment potential. Further co-occurrence networks suggested that the existence of non-random, closer and more stable ARGs-bacterial taxa relations on MP surface affected the ARG transmission. The study of ARG partitioning on MPs indicated that extracellular DNA was a nonnegligible reservoir of ARGs attached on MP surface, and that biofilm bacterial community influenced ARGs partitioning pattern during the aging process. This study confirmed that the aging process could enhance the potential of MPs as vectors for ARGs, which would promote the holistic understanding of MP behavior and risk in natural environments.
研究领域:
环境科学
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微生物学
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DOI
PubMed
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2025
·Vol. 47
·期 8
·1-20
·
IF 3.8
Hu Zhengchun,Huang Xinrui,Shen Wu,Guo Minghao,Liao Bing
Leakage and migration of landfill leachate are often accompanied by complex biogeochemical processes that form a continuous series of redox zones in the leachate plume. Nitrogen in leachate, especially NH 4 ⁺-N, is one of the most important pollutants contributing to groundwater contamination. While traditional landfill pollution prevention and control measures often have difficulty effectively addressing the complex migration and transformation behaviors of NH 4 ⁺-N in leachate, an in-depth study of the migration and transformation processes of NH 4 ⁺-N in the redox compartment is crucial for the development of accurate and efficient pollution prevention and control strategies. In this study, static transformation experiments, dynamic simulated column experiments and high-throughput sequencing techniques were used to systematically investigate the migration and transformation processes of NH₄⁺-N in the redox bands of a simulated landfill. The results showed that in the NH 4 ⁺-N transformation experiment, the soil in the simulated oxidation zone had the strongest ability to transform NH 4 ⁺-N, with the NH 4 ⁺-N concentration decreasing from 40 to 0.03 mg/L, whereas the sterilization treatment completely suppressed the transformation process of NH 4 ⁺-N in the OZ. The NH 4 ⁺-N in the continuous redox zone completely penetrated the simulated soil column on the 7th day, and the maximum effluent concentration was stable in the range of 1530 ± 30 mg/L. The trends of NH 4 ⁺-N in each independent redox zone were consistent, with the TZ having the richest microbial community abundance and number of species, and some Acidobacteria were able to reduce Fe(III) under anoxic conditions and interact with the organic matter, which effectively contributed to the cycling of Fe within the TZ. These findings indicate that there are significant differences in the biogeochemical cycling process of NH 4 ⁺-N in different redox zone environments, and this study provides a new research perspective for a deeper understanding of the biogeochemical cycling mechanism of the elements in landfills and an important scientific basis for the prevention, control, and remediation of landfill pollution.
研究领域:
环境科学
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微生物学
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水文学
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土壤化学
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产品关联
DOI
PubMed
高影响因子
Journal of Hazardous Materials Advances
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2025
·
IF 7.7
Yanjun Liu,Zefei Yang,Jingyao Chen,Huiyuan Yang,Yujia He,Zhengju Lv,Junbo Wang,Jianbing Wang
Landfills are significant sources of fugitive benzene release, posing a threat to the health of occupational populations. In this study, long-term monitoring of both external and internal benzene occupational exposure was conducted at a municipal solid waste (MSW) landfill site. The annual average concentration of benzene exposure in the landfill was 0.78 ± 1.08 μg/m³, with a notable increase in autumn (1.40 ± 5.29 μg/m³). The internal biomarker level (urinary t, t-muconic acid) significantly increased post-shift for the occupational population (6.65 ± 50.75 mg/g cr) compared to pre-shift (5.32 ± 31.62 mg/g cr, p < 0.05), exceeding the American Conference of Government Industrial Hygienists (ACGIH) limit by 13 times (0.5 mg/g cr). Machine learning models, particularly the Support Vector Regression (SVR) algorithm, outperformed traditional methods (e.g., Michaelis-Menten) in predicting internal exposure (R² = 0.989, root mean square error = 0.085). Using the SVR model, the predicted internal benzene level under the occupational exposure limit (1.7 mg/m³) was 1.65 mg/g cr, exceeding the ACGIH limit by three-fold. These findings provide a novel framework for benzene exposure risk assessment and inform targeted landfill management strategies.
研究领域:
环境卫生
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毒理学
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机器学习
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Bin Liu,Danjing Lu,Tianliang Zhang,Yixun Shen,Zhen Qiu,Xin Mao,Ruoxi Wu
Landfill leachate, with its high concentrations of persistent organic pollutants, salts, heavy metals, and emerging contaminants, presents significant environmental challenges. This study investigated the combination of dielectric barrier discharge (DBD) and ferrate (Fe(VI)) pretreatment technology in landfill leachate treatment, focusing on its effectiveness in enhancing oxidation performance and mitigating membrane fouling. The results indicated that after DBD/Fe(VI) treatment, TOC and UV 254 removal efficiencies increased by 44 % and 67 %, respectively. Additionally, the DBD/Fe(VI) system excelled in removing fluorescent substances and high molecular weight organic compounds, thereby reducing the formation of the cake layer on the nanofiltration membrane. This system enhanced oxidation performance through the synergistic production of reactive intermediates, with Fe(V)/Fe(IV) and •OH being the main active species, O 2 •- , and 1 O 2 also contributing significantly. The degradation pathway of perfluorooctanoic acid was investigated by utilizing it as the representative pollutant. Compared to the raw landfill leachate system, the DBD/Fe(VI) increased membrane flux by 104 %, while reducing reversible and irreversible fouling resistances by 67 % and 75 %, respectively. Furthermore, the advantages and practical application potential of the DBD/Fe(VI) system were evaluated from energy consumption, economic cost, and carbon dioxide emissions. The study offers an innovative method for landfill leachate treatment and fouling mitigation.
研究领域:
环境科学
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水处理技术
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产品关联
DOI
高影响因子
Environmental Science-Water Research & Technology
·
2025
·
IF 3.1
Zhongsen Yan,Zihan Tang,Yongyuan Wang,Yuling Jiang,Juxiang Jin,Haiqing Chang,Yujia Peng,Fangshu Qu
Landfill leachate contains high concentrations of hazardous pollutants that require effective treatment before discharge. Membrane distillation (MD) has emerged as a promising approach for leachate treatment, but membrane fouling remains a major challenge for its practical application. This study introduces an innovative in-situ catalytic MD membrane to improve antifouling performance. The MnO₂-doped polyvinylidene fluoride (M-PVDF) membrane was prepared via electrospinning, incorporating an optimized amount of MnO₂ and fluoroalkyl modifier. The M-PVDF membrane demonstrated excellent retention of landfill leachate pollutants across all test cycles, achieving retention rates above 99.23% for non-ammonia foulants. No membrane wetting was observed in M-PVDF during the cyclic tests, whereas conventional PVDF membranes exhibited wetting in the third cycle. The fouled M-PVDF membrane was effectively restored after cleaning with H₂O₂, regaining its original flux and demonstrating robust self-cleaning capabilities. This performance is attributed to the synergistic effects of micro-nano bubbles and MnO₂-catalyzed H₂O₂ free radicals. The proposed in-situ catalytic self-cleaning strategy significantly enhances the antifouling properties of MD, providing a sustainable solution for high-salinity wastewater treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Zhifa Qin,Xilin Lü,Lei Liu,Jiangshan Li,Yuan Li,Wengang Xie,Shenghao Zuo,Jiaxu Jin
The remediation and management of old municipal solid waste (MSW) landfills are pivotal for advancing urban ecological sustainability. This study aims to systematically assess the mechanical properties, environmental behaviors, and synergistic mechanisms of remediated landfill-mined soil-like material (SLM) through advanced oxidation and stabilization processes. The results indicate that synergistic remediation with advanced oxidation and stabilization processes significantly increased the mechanical strength of stabilized SLM to over 0.6 MPa, and reduced the organic content by about 20 %, making it suitable for reuse in geotechnical engineering. The choice of oxidizing agents markedly affected the mechanical properties of stabilized SLM; for example, the application of sodium percarbonate in conjunction with stabilized materials further enhances the strength by simultaneously promoting the pozzolanic reaction. Furthermore, the heavy metal leaching behaviors of the stabilized SLM were found to be environmentally safe. The enhanced performance of stabilized SLM is primarily attributed to the synergistic effects of oxidation and pozzolanic reactions. The advanced oxidation process decreases organic matter content and increases its stability by reducing the proportion of readily decomposable O-alkyl C. Concurrently, pozzolanic reactions produce ettringite crystals and C-(A)-S-H gels, which not only fill micropores and improve particle bonding but also aid in heavy metal immobilization through surface adsorption, complexation, and physical encapsulation. These insights provide a comprehensive understanding of the remediation processes and resource recovery potential of SLM from old MSW landfills.
研究领域:
环境工程
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土壤修复
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2025
·
IF 7.3
Qian Wang,Tao Zhang,Xuemei Liu,Shuo Liu,Xinyue Wang,Xiaoming Wang
Although 6:2 fluorotelomer alcohol (6:2 FTOH) is a common compound in landfill leachate, its anaerobic biotransformation and partitioning remain poorly understood. This study investigated the anaerobic biotransformation and partitioning of 6:2 FTOH in landfill leachate microcosms. At the end of the experiment, 19.4 mol% of the initial 6:2 FTOH partitioned into the gas phase. Therefore, anaerobic leachate could represent a significant pathway for semi-volatile 6:2 FTOH to the landfill gas or enter the atmosphere. The anaerobic biotransformation of 6:2 FTOH in leachate conformed to the first-order bi-exponential degradation model and the half-life was 12 days. The 6:2 fluorotelomer carboxylic acid (6:2 FTCA) was the main biotransformation product, accounting for 8 mol%. Moreover, microbial community composition showed the genus of Pseudomonas, DMER64, and Fastidiosipila may play a role in the biotransformation of 6:2 FTOH. This study elucidates the potential significance of biotransformation processes on both the partitioning and environmental fate of 6:2 FTOH within landfill leachate.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Hui Wang,Lusha Jiang,Chongrui Zhang,Kun Wang,Yuchao Li,Hefu Pu,Qiang Zhao
Geosynthetic clay liners (GCLs) consisting of bentonites are used worldwide for the containment of hazardous landfill leachates . However, the swelling of bentonite in aggressive leachates is suppressed, which critically decreases GCLs' barrier performance. This study proposed a polymerization method to prepare calcium-bentonite (CaB)/polymer nanocomposites for high performance GCLs under aggressive conditions. The CaB was successfully intercalated and grafted by salt resistant poly (acrylic acid-2-acryl amido-2-methyl propane sulfonic acid-N, N′-methylene bis(acrylamide)) (abbreviated as P(AA-AMPS-MBA)) networks, leading to layered structures in the resulting nanocomposites. The swell index of P(AA-AMPS-MBA)@CaB in coal combustion product (CCP) leachate ( I = 178 mM) was increased by 2.1 times relative to that of pristine CaB. Consequently, the P(AA-AMPS-MBA)@CaB exhibited excellent barrier property, with hydraulic conductivity to CCP leachate ( K CCP = 6✕10 −12 m/s) being four and one orders of magnitude lower than that of pristine CaB and the US standard for GCLs, respectively. In addition, polymer elution of P(AA-AMPS-MBA)@CaB is only 0.15% that of the control sample prepared by traditional physical mixing method.
研究领域:
环境工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）