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EFFECTIVENESS OF MONITORED NATURAL ATTENUATION (MNA) AS A GROUNDWATER REMEDY FOR ARSENIC IN PHOSPHATIC WASTES
Bessinger, B.A. and R.J.-C. Hennet.
Groundwater Monitoring & Remediation [Published online 21 Aug 2019 prior to print]
A study evaluated MNA as a remedy for arsenic in groundwater at a former phosphate mining and manufacturing facility, likely sourced from acidic and saline process water that infiltrated through unlined ponds and ditches during historical manufacturing operations. As occurred in several chemical forms in phosphatic wastes, including unstable sulfide minerals, adsorbed surface complexes, and relatively insoluble phosphate and oxide minerals, and was associated with stable minerals. Sufficient levels of Fe oxyhydroxides were present at the site to effectively limit As migration at concentrations exceeding drinking water standards in the future in the Floridan aquifer. The geochemical evaluations required to satisfy EPA guidelines to determine whether MNA is an acceptable remedy for a site are presented. The article also details the characterization and modeling that were used to demonstrate MNA effectiveness, which was ultimately selected as the remedy for As in groundwater.
Groundwater Monitoring & Remediation [Published online 21 Aug 2019 prior to print]
A study evaluated MNA as a remedy for arsenic in groundwater at a former phosphate mining and manufacturing facility, likely sourced from acidic and saline process water that infiltrated through unlined ponds and ditches during historical manufacturing operations. As occurred in several chemical forms in phosphatic wastes, including unstable sulfide minerals, adsorbed surface complexes, and relatively insoluble phosphate and oxide minerals, and was associated with stable minerals. Sufficient levels of Fe oxyhydroxides were present at the site to effectively limit As migration at concentrations exceeding drinking water standards in the future in the Floridan aquifer. The geochemical evaluations required to satisfy EPA guidelines to determine whether MNA is an acceptable remedy for a site are presented. The article also details the characterization and modeling that were used to demonstrate MNA effectiveness, which was ultimately selected as the remedy for As in groundwater.
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