zero valent iron Articles
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A Pilot Scale EZVI and ZVI Treatment of Unsaturated and Saturated Soil for TCE Reduction
ABSTRACT: Enhanced biological reductive dechlorination, micro-scale zero valent iron (ZVI), and emulsified zero valent iron (EZVI) injections were implemented to treat chlorinated volatile organic compounds (CVOCs) at a former manufacturing facility in western South Carolina. These remedial approaches – until recently typically implemented as standalone technologies –were combined to ...
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Inhibition of bacterial perchlorate reduction by zero-valent iron
Perchlorate was reduced by a mixed bacterial culture over a pH range of 7.0–8.9. Similar rates of perchlorate reduction were observed between pH 7.0 and 8.5, whereas significantly slower reduction occurred at pH 8.9. Addition of iron metal, Fe(0), to the mixed bacterial culture resulted in slower rates of perchlorate reduction. Negligible perchlorate reduction was observed under abiotic ...
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Effects of pH and ionic composition on sorption/desorption of natural organic matter on zero-valent iron and magnetite nanoparticles
Understanding the interactions between natural organic matter (NOM) and zero-valent iron nanoparticles (nano-Fe0) and magnetite nanoparticles (nano-Fe3O4) is essential for evaluating their performance in pollutant remediation, as well as determining their fate and transport in the environment. Batch experiments were performed to investigate the sorption/desorption behaviors of humic acid (HA) ...
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Case study - Reactive barrier wall project update
Reactive Barrier Wall solves space and on-going activity problems during remediation project “Name Removed”, was contracted to install a passive reactive barrier wall in “Name Removed”. The wall was designed to remediate groundwater containing tetrachloroethylene (TCE). What made this job unique was the site location. Installation would occur in an operating commercial ...
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Implementation and Evaluation of an Innovative Treatment of Xylenes and Naphthalene Using Oxidation and Biological Mechanisms
ABSTRACT: Subsequent to initial source area excavation and backfill, residual xylenes and naphthalene were treated via a biotic and abiotc approach. The remedial technology utilized free radical chemistry, oxidation chemistry and facultative biological oxidation. These processes extended the oxidant and free radical residuals while enhancing the in-situ environment for biologically based ...
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Case study - Hydraulic slurry emplacement of potassium permanganate and zero valent iron for integrated site remediation
Site Description: An active electronic manufacturing facility had an on-site TCE handling unit that was active for 10 years. During this time, approximately 1,365 gallons of solvent was released, which created an approximate 16 acre plume in saprolite and bedrock. Contaminants: Primarily TCE at concentrations greater than 200,000 ug/L in the source area with concentrations of 13,000 ug/L at the ...
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Application of coupled zero-valent iron/biochar system for degradation of chlorobenzene-contaminated groundwater
A novel iron-carbon micro-electrolysis system, bamboo-derived biochar coupled with zero-valent iron (ZVI), was investigated for chlorobenzene (CB)-contaminated groundwater removal. Influences of initial pH value, mass ratio of the ZVI/Biochar, initial CB concentration and ionic strength of the ZVI/Biochar micro-electrolysis were studied. The results indicated that the increase of initial pH ...
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Implementing and Interpreting the Full Scale Zero Valent Iron and Anaerobic Reductive Dechlorination of Trichloroethene
ABSTRACT: Enhanced reductive dechlorination and micro-scale zero valent iron injections were implemented to treat chlorinated volatile organic compounds at a former manufacturing facility in eastern Pennsylvania. These remedial approaches, commonly implemented as stand alone technologies, were combined to achieve synergistic reductions of trichloroethene and its reaction products. The ...
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Evaluation of barrier materials for removing pollutants from groundwater rich in natural organic matter
Permeable barriers are used for passive remediation of groundwater and can be constructed from a range of materials. The optimal material depends on the types of contaminants and physico-chemical parameters present at the site, as well as the hydraulic conductivity, environmental safety, availability, cost and long-term stability of the material itself. The aim of the presented study was to ...
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Hydrogeochemical and biological processes affecting the long-term performance of an iron-based permeable reactive barrier
Received for publication November 29, 2007. Despite the wide diffusion of zero-valent iron (Fe0) permeable reactive barriers (PRBs), there is still a great uncertainty about their longevity and long-term performance. The aim of this study is to investigate the biological and the hydrogeochemical processes that take place at a Fe0 installation located in Avigliana, Italy, and to derive some ...
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Enhanced Bioremediation of Tetrachloroethene in Central Indiana Glacial Till
ABSTRACT: The goal of this project is remediation of soil and groundwater impacted by tetrachloroethene (PCE) that infiltrated the vadose and uppermost saturated zone below an active dry cleaning facility in central Indiana. PCE was released and transported to depths less than five meters via the primary porosity of thin sand and silt stringers and via secondary porosity of fractures in lodgment ...
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Reclamation of unconventional water using nano zero–valent iron particles: an application for groundwater
Nano zero–valent iron (nZVI) is one of the most prominent examples of a rapidly emerging technology for the treatment of contaminated soil and groundwater. These particles were used successfully to absorb various heavy metals (e.g., Pb2+, Ba2+, As5+, As3+, Cr6+, Co2+, Cd2+, Cu2+), chlorinated organic contaminants (e.g., solvents, pesticides), nitrate and so on. nZVI particles have a large ...
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Controlling Methane ar ERD and ISCR Applications
In situ chemical reduction (ISCR) and enhanced reductive dehalogenation (ERD) have demonstrated success in the remediation of numerous recalcitrant and toxic compounds, including chlorinated ethenes and hexavalent chromium. ISCR describes the combined effect of stimulated biological oxygen consumption (via fermentation of an organic carbon source), direct chemical reduction with zero-valent iron ...
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In-Situ Remediation of Heavy Metals Using Sulfur-Based Treatment Technologies
The Metal Problem Highly toxic and highly soluble metals are contained in numerous waste streams including those from power, chemical, electronics facilities, general manufacturing plants, and mining facilities. Lead, chromium, arsenic, zinc, cadmium, copper, and mercury are the most common metal contaminants found on remediation project sites (US EPA, October, 2000). Cyanide is a common ...
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Multiparameter sonde used in combined remedy approach and saves $200,000 in potential costs - Case Study
A former dry-cleaning site in the Pacific Northwest, Ultra Custom Care Cleaners, was found to be contaminated with PCE (perchloroethylene). According to the U.S. Geological Survey (USGS), PCE was widely used in the dry cleaning of fabrics since the 1940s. PCE is one of the most frequently detected VOCs (volatile organic carbons) in groundwater at a national scale (Moran 2004). PCE is highly ...
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Apparatus for In-Situ Remediation Using Aclosed Delivery System
ABSTRACT: In the ever-emerging field of in-situ remediation many strides are being taken to improve the efficacy of degradation. Countless hours and unparalleled research is constantly being performed in order to improve or replace current technologies. These technologies include in-situ chemical oxidation, anaerobic processes, bioaugmentation, zero valent iron, stimulation, etc. Due to the ...
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Former Dry Cleaning Site Contaminated with PCE - Case Study
In-Situ® Inc. TROLL® 9500 Multiparameter Sonde helps resolve treatment challenges and saves $200,000 in drilling, reagents, and consulting. A former dry-cleaning site in the Pacific Northwest, Ultra Custom Care Cleaners, was found to be contaminated with PCE (perchloroethylene). According to the U.S. Geological Survey (USGS), PCE was widely used in the dry cleaning of fabrics since the ...
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Chlorinated VOC Groundwater & Soil Remediation - Case Study
Summary Burns & McDonnell was retained to perform soil and groundwater remediation of chlorinated volatile organic compounds (VOCs) such as perchloroethylene and trichloroethylene (PCE and TCE) at a warehouse facility in Dallas. A historical spill of the chlorinated VOCs behind the warehouse building resulted in the contamination of soil in the immediate area and shallow groundwater leading ...
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BOS 100 Takes on Carbon Tetrachloride at Oregon Site - Case Study
The subject property formerly operated as the Retail and Commercial Farm facility. The facility formerly stored and sold feed, farm equipment, and various farming chemicals (fertilizers, herbicides, and pesticides, etc.). In 2015, prior to the potential sale of the property, a Phase I Environmental Site Assessment (ESA) and subsequent Phase II ESA were undertaken. The Phase II ESA identified ...
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