Global landfill leachate characteristics: Occurrences and abundances of environmental contaminants and the microbiome

Qian, Youfen; Hu, Pengfei; Lang-Yona, Naama; Xu, Meiying; Guo, Changhong; Gu, Ji-Dong

doi:10.1016/j.jhazmat.2023.132446

Cited by 20 publications

(3 citation statements)

References 91 publications

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“…The presence of Chloroflexis favored the removal of large molecules that are difficult to degrade. Firmicutes played a role in nitrogen metabolism, which could degrade COD and lactic acid [51,52]. The investigation revealed that the seven treatment groups had comparable species composition, with very minor variations in the frequency of bacterial communities.…”

Section: Bacterial Community Compositionmentioning

confidence: 97%

Added Biochars Promoted Nitrogen and Phosphorus Removal from Ecological Ditches at Low Temperature

Bai,

Pang,

et al. 2024

Water

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The global issue of ecological ditches being poor in removing nitrogen and phosphorus under cold winter temperatures has been identified. This study introduced three types of biochar (reed, rice, and corn) into ecological ditch sediments via two application methods: rhizosphere and mixed addition. The purpose was to explore how these methods affect the removal of nitrogen and phosphorus, as well as their influences on microbial communities in sediments. The results indicated that the addition of biochar to ecological ditches significantly enhanced the removal of nitrogen and phosphorus. Among the three types of biochar, the mixed addition of corn biochar yielded the greatest results, achieving removal rates of 77.1% for total nitrogen (TN), 93.3% for NH4+-N, and 90.3% for total phosphorus (TP). The growth of Vallisneria natans was greatly improved by the mixed addition method, resulting in an average increase of 154%. This improvement was superior to the rhizosphere addition group, which led to a growth increase of 125%. In comparison, the control group (CK) showed a decrease of 4.8% in growth. Different methods of biochar addition resulted in changes in the physicochemical properties and stoichiometry of the plants. Microbial analyses showed that the addition of biochar reduced the diversity and abundance of the substrate microbial community.

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Section: Bacterial Community Compositionmentioning

confidence: 97%

Added Biochars Promoted Nitrogen and Phosphorus Removal from Ecological Ditches at Low Temperature

Bai,

Pang,

et al. 2024

Water

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“…This liquid is heavily contaminated with both organic and inorganic substances, including dissolved and suspended materials, due to its interaction with the waste materials (Naveen, 2018;Oben, 2019;Benaissa, 2022). The composition of leachate can significantly differ depending on the geographical region and the time of year, showing considerable variability (Andaloussi, 2021; Qian, 2024). Prior to being released into the natural environment, leachate must undergo treatment to mitigate its detrimental effects on both environmental and human health.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Leachate and Assessment of the Leachate Pollution Index – A Study of the Controlled Landfill in Fez

Touzani,

El Hammoudani,

Dimane

et al. 2024

Ecol. Eng. Environ. Technol.

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The rapid increase in municipal solid waste in developing areas, as demonstrated by the Fez landfill, has led to the production of leachate with alarmingly high levels of pollutants, highlighting the urgent need for comprehensive analysis and advanced treatment methods. This study uncovered exceptionally high concentrations of organic and inorganic substances, as well as heavy metals in the leachate, with chemical oxygen demand (COD) reaching 57,100 mg/L, biochemical oxygen demand (BOD₅) at 39.400 mg/L, and a significant presence of iron (Fe) at 1,370 mg/L, underscoring the extreme contamination levels. Importantly, this research introduced a notable contribution to the field by calculating a leachate pollution index (LPI) of 88.8, a figure considerably exceeding the limits considered safe for environmental discharge. The results of the current study complement the already existing information about the critical environmental threat posed by the leachate, emphasizing the necessity for extensive treatment prior to release into the environment. The study insights are crucial for developing effective strategies to reduce the risks to aquatic ecosystems and public health, as well as for guiding policy and practice in waste management in developing regions.

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“…Soil microorganisms play a key role in biogeochemical processes, pollutant degradation, and maintaining the balance of soil ecosystems (Wang W. et al, 2022;Qian et al, 2024). They can respond to changes in the external environment by adjusting their members, activity, and population composition (Ma et al, 2022;Li et al, 2024).…”

Section: Introductionmentioning

confidence: 99%

Bacterial–fungal interactions and response to heavy metal contamination of soil in agricultural areas

Li,

Zheng,

Liu

et al. 2024

Front. Microbiol.

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IntroductionLong-term heavy metal contamination of soil affects the structure and function of microbial communities. The aim of our study was to investigate the effect of soil heavy metal contamination on microorganisms and the impact of different heavy metal pollution levels on the microbial interactions.MethodsWe collected soil samples and determined soil properties. Microbial diversity was analyzed in two groups of samples using high-throughput sequencing technology. Additionally, we constructed microbial networks to analyze microbial interactions.ResultsThe pollution load index (PLI) < 1 indicates that the area is not polluted. 1 < PLI < 2 represents moderate pollution. PLI was 1.05 and 0.14 for the heavy metal contaminated area and the uncontaminated area, respectively. Cd, Hg, Pb, Zn, and Cu were identified as the major contaminants in the contaminated area, with the contamination factors were 30.35, 11.26, 5.46, 5.19, and 2.46, respectively. The diversities and compositions of the bacterial community varied significantly between the two groups. Compared to the uncontaminated area, the co-occurrence network between bacterial and fungal species in the contaminated area was more complex. The keystone taxa of the co-occurrence network in the contaminated area were more than those in the uncontaminated area and were completely different from it.DiscussionHeavy metal concentrations played a crucial role in shaping the difference in microbial community compositions. Microorganisms adapt to long-term and moderate levels of heavy metal contamination through enhanced interactions. Bacteria resistant to heavy metal concentrations may play an important role in soils contaminated with moderate levels of heavy metals over long periods of time.

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Global landfill leachate characteristics: Occurrences and abundances of environmental contaminants and the microbiome

Cited by 20 publications

References 91 publications

Added Biochars Promoted Nitrogen and Phosphorus Removal from Ecological Ditches at Low Temperature

Added Biochars Promoted Nitrogen and Phosphorus Removal from Ecological Ditches at Low Temperature

Characterization of Leachate and Assessment of the Leachate Pollution Index – A Study of the Controlled Landfill in Fez

Bacterial–fungal interactions and response to heavy metal contamination of soil in agricultural areas

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