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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Townsend, Timothy O'Donnell, Amanda Pleasant, Saraya Powell, Jon Jain, Pradeep |
| Description | Country affiliation: United States Author Affiliation: Pleasant S ( Department of Environmental Engineering Sciences, University of Florida, P. O. Box 116450, Gainesville, FL 32611, USA); O'Donnell A ( Department of Environmental Engineering Sciences, University of Florida, P. O. Box 116450, Gainesville, FL 32611, USA.); Powell J ( Innovative Waste Consulting Services, 6628 NW 9th Blvd., Suite 3, Gainesville, FL 32605, USA.); Jain P ( Innovative Waste Consulting Services, 6628 NW 9th Blvd., Suite 3, Gainesville, FL 32605, USA.); Townsend T ( Department of Environmental Engineering Sciences, University of Florida, P. O. Box 116450, Gainesville, FL 32611, USA. Electronic address: ttown@ufl.edu.) |
| Abstract | High concentrations of iron (Fe(II)) and manganese (Mn(II)) reductively dissolved from soil minerals have been detected in groundwater monitoring wells near many municipal solid waste landfills. Air sparging and vadose zone aeration (VZA) were evaluated as remedial approaches at a closed, unlined municipal solid waste landfill in Florida, USA. The goal of aeration was to oxidize Fe and Mn to their respective immobile forms. VZA and shallow air sparging using a partially submerged well screen were employed with limited success (Phase 1); decreases in dissolved iron were observed in three of nine monitoring wells during shallow air sparging and in two of 17 wells at VZA locations. During Phase 2, where deeper air sparging was employed, dissolved iron levels decreased in a significantly greater number of monitoring wells surrounding injection points, however no radial pattern was observed. Additionally, in wells affected positively by air sparging (mean total iron (FeTOT) <4.2mg/L, after commencement of air sparging), rising manganese concentrations were observed, indicating that the redox potential of the groundwater moved from an iron-reducing to a manganese-reducing environment. The mean FeTOT concentration observed in affected monitoring wells throughout the study was 1.40 mg/L compared to a background of 15.38 mg/L, while the mean Mn concentration was 0.60 mg/L compared to a background level of 0.27 mg/L. Reference wells located beyond the influence of air sparging areas showed little variation in FeTOT and Mn, indicating the observed effects were the result of air injection activities at study locations and not a natural phenomenon. Air sparging was found effective in intercepting plumes of dissolved Fe surrounding municipal landfills, but the effect on dissolved Mn was contrary to the desired outcome of decreased Mn groundwater concentrations. |
| ISSN | 00489697 |
| Volume Number | 485-486 |
| e-ISSN | 18791026 |
| Journal | Science of The Total Environment |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-07-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Environmental Restoration And Remediation Methods Groundwater Chemistry Iron Analysis Manganese Soil Pollutants Waste Disposal Facilities Water Pollutants, Chemical Volatilization Journal Article Research Support, Non-u.s. Gov't Discipline Environmental Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Waste Management and Disposal Pollution Environmental Engineering |
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