ABSTRACT
The permeable reactive barriers (PRB) can be considered as a preferable alternative of the traditional pump and treat (P&T) approach for remediation of groundwater contaminants due to its low energy and cost requirement. This study investigates the efficiency of the fabrication of zero valent iron (ZVI) with pumice stone (pumice-nZVI) experimentally and numerically as a new reactive medium for removing arsenic contamination from groundwater. A tracer test has been performed to obtain the employed material's porosity and longitudinal dispersion coefficients for the soil column. A column experiment was conducted to develop a characteristic curve depicting the percentage of arsenic removal in space and time. A 1D numerical model of the contaminant flow through the PRB is developed using the advection–dispersion equation of solute transport with a reaction term representing the contaminant's adsorption for several numerical schemes. Adsorbed arsenic concentration at 4 cm of the 16 cm thick PRB obtained from simulation is compared with the column test results to calibrate the numerical model. Study results allowed to check how long the pumice-nZVI takes to reduce the contaminant concentration below the allowable threshold depicting the capacity of reactive material. Findings show the workability of the material pumice-nZVI as a media of PRB that can be used on a large scale to alleviate arsenic contamination from groundwater.
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Rahman, A., Anurag (2022). Numerical Modeling of Contaminant Transformation in a Permeable Reactive Barrier. In: Arthur, S., Saitoh, M., Pal, S.K. (eds) Advances in Civil Engineering. Lecture Notes in Civil Engineering, vol 184. Springer, Singapore. https://doi.org/10.1007/978-981-16-5547-0_43
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DOI: https://doi.org/10.1007/978-981-16-5547-0_43
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