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Iron removal at remedial sites; new regulations drive the search for market-appropriate methods

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Authors:Horn, Brad A.; Millias, Matthew D.; Stucker, Steven P.
Author Affiliations:Primary:
Redux Technology, West Haven, CT, United States
Other:
Florida State University, United States
CDM Smith, Syracuse, NY, United States
National Grid, Syracuse, NY, United States
Volume Title:Contaminated soils, sediments, water, and energy; Volume 18
Volume Authors:Kostecki, Paul T., editor; Calabrese, Edward J.; Teaf, Christopher
Source:Proceedings - Annual International Conference on Soils, Sediments, Water and Energy, Vol.18, p.1-16; 28th annual international conference on Contaminated soils, sediments, water and energy, Amherst, MA, Oct. 15-18, 2012, edited by Paul T. Kostecki, Edward J. Calabrese and Christopher Teaf. Publisher: University of Massachusetts, Amherst, MA, United States
Publication Date:2013
Note:In English. 6 refs.; illus., incl. 2 tables
Summary:Over the past few years, new regulations limiting the discharge of iron to surface waters have become increasingly common. These regulations are particularly important in the groundwater remediation market where unique in-situ water chemistry results in elevated levels of iron as well as other minerals at a majority of sites with contaminated groundwater. Removal of iron from water tends to be challenging for a number of reasons, and commercially available methods have not been widely cost-effective in the remedial field. The assessment criteria for iron removal technology at remedial sites is market-specific, and thus distinct from other markets where iron removal has been practiced. When assessing iron removal in remedial applications, key market-specific technical issues include: 1) space constraints; 2) operator requirements; 3) sludge generation, post-treatment and disposal costs; 4) head loss and operating pressure requirement; and 5) generation of backwash water requiring post-treatment units. Since 2008, Redux has invested in an R&D effort to identify iron removal methods most appropriate for remedial applications, and to use our chemical knowledge to enhance promising techniques or develop new ones. This work has involved lab and bench-top studies, as well as pilot work in the field. Techniques studied include bag filtration, settlers, cross-flow micro-filters, sand, greensand and multi-media filters, and other specialty media filters, as well as all of these methods in conjunction with pretreatment chemicals. This paper provides a review of iron removal technology alternatives and an assessment of their applicability to remedial applications. It presents bench-top and pilot scale work at many sites where these alternatives have been considered. Finally, it presents new technology, now in commercial application, which shows significant promise in being the most appropriate technique yet discovered by the authors for this niche treatment application.
Subjects:Biodegradation; Concentration; Cost; Decontamination; Drinking water; Effluents; Experimental studies; Filtration; Ground water; Iron; Metals; Optimization; Oxidation; Pollution; Remediation; Solubility; Surface water; Technology; Water pollution; Water quality; Bead filters
Record ID:806780-2
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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