Nanosized iron based permeable reactive barriers for nitrate removal – Systematic review

Araújo, Rui Esteves; Castro, Ana C. Meira; Baptista, J. Santos; Fiúza, António

doi:10.1016/j.pce.2015.11.007

Cited by 23 publications

(7 citation statements)

References 51 publications

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“…In the literature, several works can be found that address these processes (Ribeiro et we evaluated the use of permeable reactive barriers (PRB) between the electrodes, which have been used as an in-situ technology for the remediation of contaminated sites (Araujo et al, 2016). In general, a PRB is constructed perpendicular to the groundwater flow and below the phreatic level so that the natural hydraulic gradient carries the contaminant through the reactive medium of the PRB and can degrade or immobilize it as water flows through the barrier.…”

Section: Introductionmentioning

confidence: 99%

Testing different strategies for the remediation of soils polluted with lindane

Vidal

Carvela

Sáez

et al. 2020

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Testing different strategies for the remediation of soils polluted with lindane

Vidal

Carvela

Sáez

et al. 2020

Chemical Engineering Journal

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“…Hudak [28] suggested longitudinal reactive barriers instead of transverse barriers with respect to groundwater flow direction and modeled this configuration. [38] reviewed the researches of using both metallic iron and nanomaterials within permeable reactive barriers to reduce of nitrate concentration in drinking water which has been worldwide prevalence over the last two decades. In general, they support the concept that truly in short term, the utilization of nZVI materials with permeable reactive barriers is a good performance technology for denitrification, but the long-term impact of the use of this materials in this remediation process, both on the environment and on the human health, is far to be conveniently known.…”

Section: Sheet Piling Funnels Direct the Plume Through The Reactive Gatementioning

confidence: 99%

Untitled

2019

RJLBPCS

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The pollution of groundwater by organic or inorganic pollutants, originating from either soil leaching or anthropogenic activities, is one of the major environmental issues.Remediation of this water source is of highest priority because many countries use it for drinking purpose. Pump-and-treat method is represented for many decades the major technique to treat groundwater infected with organic/inorganic pollutants. In last two decades, this technique becomes to be in lack with the sense of modern concepts of sustainability and renewable energy. Permeable reactive barriers (PRBs) technology was introduced as an alternative method for traditional pumpand-treat systems to remediate contaminated groundwater that was achieving these concepts. Within this issue, this technology has been proven to be a successful and most efficient promising method used by many researchers and in several projects due to its direct and simple techniques to remediate groundwater. A rapid progress from bench scale to field scale implementation in the PRB technique is recognized through the last few years. In addition, this technique was modeled theoretically for characterizing the migration of contaminants spatially and temporally through the barrier and, consequently, these models can be used for estimating the longevity of this barrier. An overview of this technique and the promising horizons for scientific research that integrates this method with sustainability and green technology practices are presented in the present study.

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“…In that case, the permeable wall consisted of a mixture of granular iron and sand. Since then, PRBs have been used for the removal of chromium and other metals, as well as radionuclides and nitrates, using different materials as reactive media [4]. Today, PRB is recognized as a fully developed conventional technology.…”

Section: Introductionmentioning

confidence: 99%

Chemical Reduction of Nitrate by Zero-Valent Iron: Shrinking-Core versus Surface Kinetics Models

Villén-Guzmán

Paz‐Garcia

Arhoun

et al. 2020

IJERPH

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Zero valent iron (ZVI) is being used in permeable reactive barriers (PRB) for the removal of oxidant contaminants, from nitrate to chlorinated organics. A sound design of these barriers requires a good understanding of kinetics. Here we present a study of the kinetics of nitrate reduction under relatively low values of pH, from 2 to 4.5. We use a particle size of 0.42 mm, which is within the recommended size for PRBs (0.2 mm to 2.0 mm). In order to avoid possible mass-transfer limitations, a well-stirred reactor coupled with a fluidized bed reactor was used. The experiments were performed at constant pH values using a pH controller that allows to accurately track the amount of acid added. Since the reduction of H + to H 2 by the oxidation of ZVI will always be present for these pH values, blank experiments (without nitrate) were performed and the rate of this H + reduction obtained. This rate of reduction was studied using three kinetic models: a regular empirical one, the Shrinking-Core Model (SCM), and the Surface Kinetics Model (SKM). The best performance was obtained from the SKM model. Therefore, this model was also used to study the results for the nitrate reduction, also with satisfactory results. In both cases, some assumptions are introduced to maintain a moderate number of fitting parameters.

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Nanosized iron based permeable reactive barriers for nitrate removal – Systematic review

Cited by 23 publications

References 51 publications

Testing different strategies for the remediation of soils polluted with lindane

Testing different strategies for the remediation of soils polluted with lindane

Untitled

Chemical Reduction of Nitrate by Zero-Valent Iron: Shrinking-Core versus Surface Kinetics Models

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