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Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...

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Groundwater recharge, salinization, and mixing mechanisms between the shallow and fossil aquifers of the Atlantic Sahara, Morocco.

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Combining porewater profiles and batch tests to quantify redox reactions and heavy-metal(loid)s release potentially induced by managed aquifer recharge.

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Systematic review on the effects of wastewater chemical composition on crop yield under fertigation practices.

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Soil quality under rotational and conventional grazing in Mediterranean areas at desertification risk.

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Additional sources of salinity and heavy metals from plant residues of peaty horizons in the Po River lowland (Italy).

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Flow-interruption experiments to quantify trace elements leaching from a shallow saline aquitard.

Abraham Ofori1, Luigi Alessandrino1, Regmi Vipin2

  • 1DiSTABiF - Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, Campania University "Luigi Vanvitelli", Via Vivaldi 43, 81100, Caserta, Italy.

The Science of the Total Environment
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Summary
This summary is machine-generated.

Sub-irrigation in coastal deltaic areas can mobilize toxic trace elements (TE) into groundwater. Intermittent water flow in these soils releases elements like arsenic and lead, posing risks to drinking water quality.

Keywords:
Column leaching experimentsGroundwater fresheningPyrite oxidationSequential extractionTrace elements mobility

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Area of Science:

  • Environmental Science
  • Hydrogeology
  • Geochemistry

Background:

  • Salinity in coastal deltaic regions is a growing global concern due to climate change and water overuse.
  • Sub-irrigation practices in these areas can enhance the movement of trace elements (TE) into groundwater.

Purpose of the Study:

  • To investigate the impact of intermittent sub-irrigation on trace element leaching in salinized peaty aquitards.
  • To assess the transport and geochemical alterations of trace elements under simulated sub-irrigation conditions.

Main Methods:

  • Column experiments using synthetic rainwater on salinized peaty soil from the Po Delta.
  • Non-equilibrium transport and cation exchange assessed using a sodium chloride (NaCl) tracer test.
  • Simulations using CXTFIT 2.0 to quantify sorption and non-equilibrium processes.
  • Sequential extraction analysis pre- and post-experiment to evaluate geochemical changes.

Main Results:

  • Flow interruptions led to peaks of arsenic (As), manganese (Mn), lead (Pb), and nickel (Ni) exceeding drinking water standards.
  • Sodium (Na+) exchange from clays and organic matter facilitated trace element elution.
  • Partial oxidation of pyrite and arsenopyrite contributed to the sustained release of trace elements.
  • Chlorine (Cl-) elution was retarded due to diffusion into organic matter fragments.

Conclusions:

  • Alternating sub-irrigation in reducing, peaty deltaic environments can mobilize trace elements into groundwater.
  • These findings are significant for similar hydrogeological settings globally, including agricultural systems and aquifer restoration.
  • Intermittent irrigation strategies require careful management to mitigate trace element contamination risks.