Long-term redox conditions in a landfill-leachate-contaminated groundwater

Abiriga, Daniel; Vestgarden, Live Semb; Klempe, Harald

doi:10.1016/j.scitotenv.2020.143725

Cited by 26 publications

(8 citation statements)

References 49 publications

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“…In the group of microelements, Fe and Mn were typically determined as indicative parameters as expected [8,24], since both occur in areas where the reduction conditions downstream of the landfill are significant [3]. The metals B, Co, and Ni were also detected at more than 50% of the landfills, as expected [48].…”

Section: Indicative Parameters Of Impacts On Groundwatermentioning

confidence: 63%

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Synoptic Risk Assessment of Groundwater Contamination from Landfills

et al. 2022

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Waste management in Europe has improved in recent years, reducing the amount of waste disposed at landfills. However, there are still many landfills in the countries. It is well known that landfills that do not have measures in place to control leachate entering groundwater can contaminate groundwater long after the landfill is closed. Collecting monitoring results from all landfills allows permitting and management agencies to improve action plans. This relies on a synoptic risk assessment that allows prioritization and milestones to be set for required actions. The developed method of synoptic risk assessment is based on a conceptual model of the landfill and the results of chemical groundwater monitoring tested at 69 landfills in Slovenia. The study confirms that most landfills have a direct or indirect impact on groundwater quality. All landfills were classified into three priority classes on the basis of the synoptic risk assessment. The results show that a total of 24 landfills have a clearly pronounced impact on groundwater. A total of 31 landfills have a less pronounced impact due to the favorable natural attenuation capacity of the soil or the technically appropriate design of the landfill itself. A total of 14 landfills have a less pronounced or negligible impact on groundwater.

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Section: Indicative Parameters Of Impacts On Groundwatermentioning

confidence: 63%

“…Landfills represent a variety of potential local sources of environmental pollution. One of the main hazards related with landfilling is the generation of leachate [1][2][3]. After the leachate has permeated the waste deposits and reached the groundwater and surface water, it may cause contamination in the wider environment.…”

Section: Introductionmentioning

confidence: 99%

Synoptic Risk Assessment of Groundwater Contamination from Landfills

et al. 2022

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“…On the other hand, the change in pH and ORP may account for a variety of concentrations of NH 4 + -N and NO 3 − -N. Among different species of inorganic nitrogen, NH 4 + -N is an electron donor in nitrification, and NO 3 − -N is an electron acceptor in denitrification. The preference for redox species in oxidation reactions is DO > nitrate > sulfate, which is referred to as the terminal electron-accepting processes [9]. Under the high DO condition, NH 4 + -N is easily oxidated to NO 2 − -N and NO 3 − -N through nitrification, and the nitrification can occur in a large range of DO, i.e., 0.3-4 mg/L [26].…”

Section: The Transformation Of Din and Correlation Analysismentioning

confidence: 99%

“…The NH 4 + -N is one of the major pollution components of some contaminated groundwaters, such as the landfill-leachate-contaminated groundwater [9], but its transport processes and transformation mechanism through aquifers are complex [10]. In contaminated groundwaters, movement of NH 4 + -N is retardative and may be approximately 0.25 times the average groundwater velocity [11], thus NH 4 + -N polluted groundwater can be retained underground and cannot be easily removed.…”

Section: Introductionmentioning

confidence: 99%

Spatial-Temporal Distribution, Morphological Transformation, and Potential Risk of Dissolved Inorganic Nitrogen in the Contaminated Unconfined Aquifer from a Retired Nitrogenous Fertilizer Plant

Yang

Jiang

Chen

et al. 2022

IJERPH

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The accumulation of nitrogen in groundwater in the industrial plots, especially the high ammonium, can result in a serious threat to the groundwater system in the urban area. This study monitored the dissolved inorganic nitrogen (DIN) of the polluted groundwater four times in one year in a retired nitrogenous fertilizer plant site with a production history of nearly 40 years, to analyze the spatial-temporal characteristics of DIN species (NH4+-N, NO3−-N, and NO2−-N) and the effects of groundwater environment on their transfer and transformation. The results showed that NH4+-N (<0.025 to 1310 mg/L) was the main DIN species (61.38–76.80%) with low mobility, whereas the concentration of NO3−-N and NO2−-N was 0.15–146 mg/L and <0.001–12.4 mg/L, accounting for 22.34–36.07% and 0.53–2.83% of total DIN, respectively. The concentration and proportion of NO3−-N and NO2−-N showed an upward trend with time, posing a threat to the safety of surrounding groundwater, and their high spatial-temporal variation was related to the morphological transformation and the transport. In the wet season, the pH and redox condition benefited the nitrification, and NO3−-N easily migrated from the deep soil solution to groundwater, hence the NO3−-N can be accumulated. Therefore, the analysis of species and behaviors of DIN in shallow groundwater is indispensable for environmental risk assessment.

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“…) and xenobiotic organic compounds (Thitame et al 2010;Abiriga et al 2020;Lee et al 2020). Leachate has been reported to migrate from unsaturated zone to groundwater where it gets mixed and forms plume which spreads with groundwater movement (Shu et al 2018;Abiriga et al, 2021b).…”

Section: Introductionmentioning

confidence: 99%

How much spatial and temporal variation in groundwater microbiology can occur following open dumping of municipal solid waste?

Kumar

Verma

Iqbal

et al. 2022

Water Practice and Technology

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Effects of open dumping of municipal solid waste on local groundwater microbiology were assessed in Ranchi, India. Both the spatial and temporal variations of groundwater microbiology were studied. Groundwater was analyzed to determine heterotrophic plate count (HPC), total coliforms (TC) and faecal coliforms (FC). Highest HPC was 4.5 × 104 CFU/mL and the highest total coliform count was 3.7 × 104 CFU/mL. Faecal coliforms were detected in most of the groundwater samples. The highest faecal coliform count of 2.1 × 104 CFU/mL was from a hand pump located adjacent to the dumping site. Spatial variations revealed dispersion of bacterial contamination up to 5 km from the periphery of the municipal solid waste dump. The level of bacterial contamination decreased with an increase in distance from the municipal solid waste dump. The maximum bacterial count was detected in the monsoon whereas the lowest count was found in summer. Molecular characterization of morphologically similar faecal coliform colonies indicated the presence of Klebsiella pneumoniae (Klebsiella ssnkbit, KU647674) in one of the groundwater samples which showed maximum faecal coliform count. Results of this study indicated that groundwater in the area is highly contaminated with a bacterial load which can be a major health risk.

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Long-term redox conditions in a landfill-leachate-contaminated groundwater

Cited by 26 publications

References 49 publications

Synoptic Risk Assessment of Groundwater Contamination from Landfills

Synoptic Risk Assessment of Groundwater Contamination from Landfills

Spatial-Temporal Distribution, Morphological Transformation, and Potential Risk of Dissolved Inorganic Nitrogen in the Contaminated Unconfined Aquifer from a Retired Nitrogenous Fertilizer Plant

How much spatial and temporal variation in groundwater microbiology can occur following open dumping of municipal solid waste?

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