Geochemical processes controlling the groundwater transport of contaminants released by a dump in an arid region of México

Gómez-Puentes, Francisco Javier; Reyes-López, Jaime Alonso; López, Dina L.; Carreón-Diazconti, Concepción; Belmonte-Jiménez, Salvador Isidro

doi:10.1007/s12665-013-2456-2

Cited by 13 publications

(8 citation statements)

References 16 publications

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“…The water table within the dump is located at an average depth of 3 m from the surface, and the local direction of groundwater flow is oriented southeast-northwest with an average hydraulic gradient of 0.3 % (ValdezCarrillo 2010). Gómez-Puentes et al (2013) indicate that groundwater has a high content of dissolved solids ranging between 1000 and 2200 mg/L, in contrast with surface water used for agricultural irrigation that contains an average of 760 mg/L. Irrigation water contributes to keep the water table in a shallow level.…”

Section: Study Areamentioning

confidence: 99%

“…This behavior suggests that the topography of the dump area plays a role in the distribution of pollutants. When it rains, overland flow could make the contaminated soil particles to move and deposit in the lower elevation area of the site (Gómez-Puentes et al 2013). However, due to low rainfall, it is expected a slow transport of solutes in the vadose zone.…”

Section: Study Areamentioning

confidence: 99%

“…Water evaporation depends on climatic variations throughout the year. July and August are the months with the greatest potential evapotranspiration (*1000 mm water/month) (Gómez-Puentes et al 2013). Therefore, different combinations were tested for modeling the quantities related to these processes considering both negligible water evaporation and complete water evaporation (*55.5 mol per kilogram).…”

Section: Groundwater Geochemical Modelingmentioning

confidence: 99%

“…The dumpsite called Vado Carranza is a clear example of these unregulated disposal sites. In this site, the operating characteristics, including the uncontrolled disposal and open burning of USW in addition to the presence of a shallow aquifer, have motivated several investigations to assess its environmental impact (ValdezCarrillo 2010;Atencio-Pérez 2011;Gómez-Puentes et al 2013). In sites like this, the subsurface contaminants flow depending on the physical soil properties, climate conditions and water table level.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical modeling and low-frequency geoelectrical methods to evaluate the impact of an open dump in arid and deltaic environments

et al. 2016

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In Mexico, open dumps that are maintained by the municipality but provide no covering of waste are not uncommon. Further, disposal at these sites is often performed by burning. The aim of this study was to determine the leachate plume from an open dump located in a depositional deltaic environment, with arid climate, low rainfall and where the water table is about 2 m below the surface. The methodology comprised analysis of groundwater monitoring wells and geophysical and geochemical prospecting techniques. The 3D geoelectric interpretation shows a typical area of these depositional environments with low resistive values (10-20 X-m) associated with the presence of sands and clays interbedded. However, there is a very low resistivity zone associated with the dump's impact which reaches values below 5 X-m, and it is located where the disposal and burning of wastes occurred. Another zone with values above 16 X-m appears as a limit for the advance of the saline. This is interpreted as a sandy lenses area. These sandy lenses with higher porosity transport aquifer's water. Thus the dump is in direct contact by this conduct with clean groundwater. Piper diagrams constructed with the chemical data analysis reveal that the groundwater in the area corresponds to the chlorinated and/or sulfated sodium type, showing the impact caused by the dump. The monitoring well (NP8, on-site) with the highest dissolved solids content behaves anomalously and belongs to the more conductive zone according to the geoelectric profiles. The subsoil geochemical behavior is influenced by the seasonal water table variations provoking the dissolution of burned and unburned wastes, but the effects of slow flows in the direction of the regional flow are not discarded. Although the most impacted area within the dump is characterized to a depth of 10 m, there is a slow flow in the direction of the regional flow that has been moving pollutants out of the dumpsite during its almost 20 years of operation. The results of this study provide valuable information for the authorities to carry out an appropriate restoration project.

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Section: Study Areamentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Groundwater Geochemical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochemical modeling and low-frequency geoelectrical methods to evaluate the impact of an open dump in arid and deltaic environments

et al. 2016

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“…However, in those with low technical-environmental management, they are the primary source of putrefactive odors, surface and underground contamination due to the leachate produced, causing diseases and other environmental damage. [6,7]. Therefore, the implementation of an SL is of great benefit under specific observations and technicalenvironmental details, which the authorities exercise for the correct orientation of the work personnel and proper handling of the leachates [8,9].…”

Section: Introductionmentioning

confidence: 99%

Considerations in the Methodology for the Technical-Environmental Viability of Sanitary Landfills in Rural Communities. Northern Case of the Province of Santa Elena, Ecuador

Morante-Carballo¹,

Apolo-Masache²,

Carrión-Mero³

et al. 2021

IJSDP

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This research focuses on providing a solution to rural sectors' problems regarding solid waste management and final disposal. It considered the Sanitary Landfill (SL) technical-environmental viability for rural communities in the north of Santa Elena-Ecuador. The objective is to propose a methodology for evaluating a sanitary landfill's technical-environmental viability, considering a Key Factors Matrix (KFM) for the possibility of its application in rural communities. The proposed methodology is based on: i) identification of preliminary and field data for assessment of the sector through the KFM, and ii) determination of the technical-environmental viability of an SL according to the aspects considered. The KFM allowed the Ayangue commune to be chosen for the location of the SL under certain precautions. Given this sector's tourist influence, solid waste accumulates 40 tons per day from the ninth year on. Therefore, it is recommended to bear in mind a possible restructuring of the SL, from a semi-mechanized system to a fully mechanized one.

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Contaminant transport in the sub-surface soil of an uncontrolled landfill site in China: site investigation and two-dimensional numerical analysis

Xie

Chen

Thomas

et al. 2015

Environ Sci Pollut Res

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A field investigation of contaminant transport beneath and around an uncontrolled landfill site in Huainan in China is presented in this paper. The research aimed at studying the migration of some chemicals present in the landfill leachate into the surrounding clayey soils after 17 years of landfill operation. The concentrations of chloride and sodium ions in the pore water of soil samples collected at depths up to 15 m were obtained through an extensive site investigation. The contents of organic matter in the soil samples were also determined. A two-dimensional numerical study of the reactive transport of sodium and chloride ion in the soil strata beneath and outside the landfill is also presented. The numerical modelling approach adopted is based on finite element/finite difference techniques. The domain size of approximately 300 × 30 m has been analysed and major chemical transport parameters/mechanisms are established via a series of calibration exercises. Numerical simulations were then performed to predict the long-term behaviour of the landfill in relation to the chemicals studied. The lateral migration distance of the chloride ions was more than 40 m which indicates that the advection and mechanical dispersion are the dominant mechanism controlling the contaminant transport at this site. The results obtained from the analysis of chloride and sodium migration also indicated a non-uniform advective flow regime of ions with depth, which were localised in the first few metres of the soil beneath the disposal site. The results of long-term simulations of contaminant transport indicated that the concentrations of ions can be 10 to 30 times larger than that related to the allowable limit of concentration values. The results of this study may be of application and interest in the assessment of potential groundwater and soil contamination at this site with a late Pleistocene clayey soil. The obtained transport properties of the soils and the contaminant transport mechanisms can also be used for the design of engineered barriers for the control of the long-term pollution of the site.

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Geochemical processes controlling the groundwater transport of contaminants released by a dump in an arid region of México

Cited by 13 publications

References 16 publications

Geochemical modeling and low-frequency geoelectrical methods to evaluate the impact of an open dump in arid and deltaic environments

Geochemical modeling and low-frequency geoelectrical methods to evaluate the impact of an open dump in arid and deltaic environments

Considerations in the Methodology for the Technical-Environmental Viability of Sanitary Landfills in Rural Communities. Northern Case of the Province of Santa Elena, Ecuador

Contaminant transport in the sub-surface soil of an uncontrolled landfill site in China: site investigation and two-dimensional numerical analysis

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