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| id="mp-left" class="MainPageBG" style="width:55%; padding:0; vertical-align:top; color:#000;" | | | id="mp-left" class="MainPageBG" style="width:55%; padding:0; vertical-align:top; color:#000;" | | ||
− | <h2 id="mp-tfa-h2" style="margin:0.5em; background:#cef2e0; font-family:inherit; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; color:#000; padding:0.2em 0.4em;"> Featured article: | + | <h2 id="mp-tfa-h2" style="margin:0.5em; background:#cef2e0; font-family:inherit; font-size:120%; font-weight:bold; border:1px solid #a3bfb1; color:#000; padding:0.2em 0.4em;"> Featured article: PFAS Treatment by Anion Exchange</h2> |
− | <div id="mp-tfa" style="padding:0.0em 1.0em;">[[File: | + | <div id="mp-tfa" style="padding:0.0em 1.0em;">[[File:StrathmannFig1.png|200px|left|link=PFAS Treatment by Anion Exchange]]<dailyfeaturedpage></dailyfeaturedpage> |
− | [[ | + | [[PFAS Treatment by Anion Exchange|(Full article...)]] </div> |
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**[[Vapor Intrusion - Separation Distances from Petroleum Sources]] | **[[Vapor Intrusion - Separation Distances from Petroleum Sources]] | ||
**[[Vapor Intrusion – Sewers and Utility Tunnels as Preferential Pathways|Vapor Intrusion - Sewers and Utility Tunnels as Preferential Pathways]] | **[[Vapor Intrusion – Sewers and Utility Tunnels as Preferential Pathways|Vapor Intrusion - Sewers and Utility Tunnels as Preferential Pathways]] | ||
+ | **[[Assessing Vapor Intrusion (VI) Impacts in Neighborhoods with Groundwater Contaminated by Chlorinated Volatile Organic Chemicals (CVOCs)|Vapor Intrusion - Assessing VI Impacts in Neighborhoods with Groundwater Contaminated CVOCs]] | ||
<u>'''[[Characterization, Assessment & Monitoring]]'''</u> | <u>'''[[Characterization, Assessment & Monitoring]]'''</u> | ||
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**[[Stable Isotope Probing (SIP)]] | **[[Stable Isotope Probing (SIP)]] | ||
*[[Natural Attenuation in Source Zone and Groundwater Plume - Bemidji Crude Oil Spill | Natural Attenuation in Source Zone and Groundwater Plume -<br /> Bemidji Crude Oil Spill]] | *[[Natural Attenuation in Source Zone and Groundwater Plume - Bemidji Crude Oil Spill | Natural Attenuation in Source Zone and Groundwater Plume -<br /> Bemidji Crude Oil Spill]] | ||
+ | *[[OPTically-based In-situ Characterization System (OPTICS)]] | ||
<u>'''[[Climate Change Primer | Climate Change]]'''</u> | <u>'''[[Climate Change Primer | Climate Change]]'''</u> | ||
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*[[Passive Sampling of Munitions Constituents| Passive Sampling]] | *[[Passive Sampling of Munitions Constituents| Passive Sampling]] | ||
*[[Munitions Constituents – Photolysis | Photolysis]] | *[[Munitions Constituents – Photolysis | Photolysis]] | ||
+ | *[[Munitions Constituents – Sample Extraction and Analytical Techniques|Sample Extraction and Analytical Techniques]] | ||
*[[Munitions Constituents - Soil Sampling | Soil Sampling]] | *[[Munitions Constituents - Soil Sampling | Soil Sampling]] | ||
*[[Munitions Constituents - Sorption | Sorption]] | *[[Munitions Constituents - Sorption | Sorption]] | ||
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*[[PFAS Ex Situ Water Treatment]] | *[[PFAS Ex Situ Water Treatment]] | ||
+ | **[[PFAS Treatment by Anion Exchange]] | ||
*[[PFAS Soil Remediation Technologies]] | *[[PFAS Soil Remediation Technologies]] | ||
*[[PFAS Sources]] | *[[PFAS Sources]] | ||
*[[PFAS Transport and Fate]] | *[[PFAS Transport and Fate]] | ||
*[[PFAS Treatment by Electrical Discharge Plasma]] | *[[PFAS Treatment by Electrical Discharge Plasma]] | ||
− | *[[Photoactivated Reductive Defluorination - PFAS Destruction|Photoactivated Reductive Defluorination]] | + | *[[Photoactivated Reductive Defluorination - PFAS Destruction|Photoactivated Reductive Defluorination]] |
<u>'''[[Regulatory Issues and Site Management]]'''</u> | <u>'''[[Regulatory Issues and Site Management]]'''</u> |
Latest revision as of 20:09, 11 September 2024
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The goal of ENVIRO Wiki is to make scientific and engineering research results more accessible to environmental professionals, facilitating the permitting, design and implementation of environmental projects. Articles are written and edited by invited experts (see Contributors) to summarize current knowledge for the target audience on an array of topics, with cross-linked references to reports and technical literature. | See Table of Contents |
Featured article: PFAS Treatment by Anion Exchange Anion exchange has emerged as one of the most effective and economical technologies for treatment of water contaminated by per- and polyfluoroalkyl substances (PFAS). Anion exchange is an adsorptive treatment technology that uses polymeric resin beads (0.5–1 mm diameter) that incorporate cationic adsorption sites to remove anionic pollutants from water. Resins most commonly utilized for PFAS treatment are strong base anion exchange resins (SB-AERs) that incorporate quaternary ammonium cationic functional groups with hydrocarbon side chains (R-groups) that promote PFAS adsorption by a combination of electrostatic and hydrophobic mechanisms.Anion exchange treatment of water is accomplished by pumping contaminated water through fixed bed reactors filled with AERs. Water flows through the pore spaces in close contact with resin beads. Sufficient contact time needs to be provided, referred to as empty bed contact time (EBCT), to allow PFAS to diffuse from the water into the resin structure and adsorb to exchange sites. Life cycle cost analyses show that anion exchange treatment is a viable alternative to GAC adsorption.A critical parameter that will dictate media usage or regeneration, and ultimately O&M costs, is the criteria used to determine when ‘PFAS breakthrough’ is reached.
(Full article...)
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