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Direct Bio Regeneration Of Spent Anion Exchange Resins Used In Filtration Treatment Of Perchlorate
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Book Synopsis Direct Bio-regeneration of Spent Anion Exchange Resins Used in Filtration Treatment of Perchlorate by : Chao Wang
Download or read book Direct Bio-regeneration of Spent Anion Exchange Resins Used in Filtration Treatment of Perchlorate written by Chao Wang and published by . This book was released on 2008 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bio-regeneration of Spent Anion Exchange Resins Generated in Filtration Treatment of Nitrate by : Mengrong Tian
Download or read book Bio-regeneration of Spent Anion Exchange Resins Generated in Filtration Treatment of Nitrate written by Mengrong Tian and published by . This book was released on 2011 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bio-regeneration of Spent Anion Exchange Resin Produced in Treatment of Nitrate Contaminated Water by : Xiaoyang Meng
Download or read book Bio-regeneration of Spent Anion Exchange Resin Produced in Treatment of Nitrate Contaminated Water written by Xiaoyang Meng and published by . This book was released on 2013 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Treatability of Perchlorate in Groundwater Using Ion Exchange Technology - Phase II by : L. Aldridge
Download or read book Treatability of Perchlorate in Groundwater Using Ion Exchange Technology - Phase II written by L. Aldridge and published by IWA Publishing (International Water Assoc). This book was released on 2005-04-30 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1997, several perchlorate treatment technologies have proven to be technically feasible at drinking-water treatment scale: biological reduction, ion exchange, reverse osmosis (RO) membranes, and granular activated carbon (GAC). The objectives of this project were to demonstrate the long-term performance of conventional ion-exchange technology for perchlorate removal and evaluate three disparate alternatives (chemical, biological, electrolytic) for brine treatment and reuse. This project evaluated three fundamentally different brine treatment and reuse processes. The first process, the biological brine treatment system, operated as a sequencing batch reactor (SBR). Spent 3 percent (0.5 N NaCl) brine was introduced to the nitrate and perchlorate degrading culture in the reactor and acetic acid was supplied to this culture as an electron donor for the reduction process. Once the nitrate and perchlorate were biodegraded, the mixture was settled, filtered, and amended with chloride before its reuse as regenerant solution. The second process, the physical/chemical brine treatment system, employed a high-pressure and high-temperature catalytic process to reduce the nitrate and perchlorate in the spent brine. After the process, the treated brine was ready for reuse without subsequent treatment. The system used a stoichiometric dose of a chemical reductant (ammonia) based on the measured concentrations of nitrate and perchlorate in the spent brine. The last process, a simple bipolar electrochemical cell, electrolytically reduced the perchlorate and/or nitrate present in the spent ion exchange brine. Once reduced, the brine could be immediately reused. This process did not require the addition of an electron donor as with the biological process, or a reductant as with the physical/chemical treatment process.
Book Synopsis Treatment of Perchlorate in Groundwater by Ion Exchange Technology by : Dennis A. Clifford
Download or read book Treatment of Perchlorate in Groundwater by Ion Exchange Technology written by Dennis A. Clifford and published by American Water Works Association. This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research project was to provide information, based on laboratory experiments and bench-scale testing and verification, to suggest perchlorate ion exchange treatment options suitable for pilot-scale testing. The large experimentally determined range of perchlorate selectivity exhibited by commercially available ion exchange resins suggested three treatment options: (1) conventional exhaustion regeneration with polyacrylic resins; (2) partial exhaustion followed by elevated-temperature regeneration and destruction of perchlorate and nitrate prior to brine reuse with polystyrene type I resins; and (3) complete exhaustion and replacement of the ion exchange resin for highly perchlorate-selective resins. Biological reduction of both perchlorate and nitrate in the spent brine was demonstrated as a possible pretreatment step prior to brine reuse. The goals of this work were met, and the options are now being implemented in phase II pilot-scale testing.
Book Synopsis Treatment of Perchlorate Using Single-Use Ion-Exchange Resins by : L. Aldridge
Download or read book Treatment of Perchlorate Using Single-Use Ion-Exchange Resins written by L. Aldridge and published by International Water Assn. This book was released on 2005-01-01 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this project was to update the exis
Book Synopsis Biological Regeneration of Perchlorate Loaded Strong Base Anion Exchange Resins by : Vikram Kashyap
Download or read book Biological Regeneration of Perchlorate Loaded Strong Base Anion Exchange Resins written by Vikram Kashyap and published by . This book was released on 2006 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Treatment of Perchlorate Using Single-use Ion Exchange Resins by :
Download or read book Treatment of Perchlorate Using Single-use Ion Exchange Resins written by and published by . This book was released on 2004 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Treatment of Perchlorate-Contaminated Groundwater Using Highly-Selective, Regenerable Anion-Exchange Resins at Edwards Air Force Base by :
Download or read book Treatment of Perchlorate-Contaminated Groundwater Using Highly-Selective, Regenerable Anion-Exchange Resins at Edwards Air Force Base written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selective ion exchange is one of the most effective treatment technologies for removing low levels of perchlorate (ClO4−) from contaminated water because of its high efficiency without adverse impacts on the water quality caused by adding or removing any chemicals or nutrients. This report summarizes both the laboratory and a field pilot-scale studies to determine the ability and efficiency of the bifunctional synthetic resins to remove ClO4− from the contaminated groundwater at the Edwards Air Force Base in California. Regeneration of the resins after groundwater treatment was also evaluated using the FeCl3-HCl regeneration technique recently developed at Oak Ridge National Laboratory. On the basis of this study, the bifunctional resin, D-3696 was found to be highly selective toward ClO4− and performed much better than one of the best commercial nitrate-selective resins (Purolite A-520E) and more than an order of magnitude better than the Purolite A-500 resin (with a relatively low selectivity). At an influent concentration of ≈ 450 {micro}g/L ClO4− in groundwater, the bifunctional resin bed treated ≈ 40,000 empty bed volumes of groundwater before a significant breakthrough of ClO4− occurred. The presence of relatively high concentrations of chloride and sulfate in site groundwater did not appear to affect the ability of the bifunctional resin to remove ClO4−. However, the presence of high iron or iron oxyhydroxides and/or biomass in groundwater caused a significant fouling of the resin beds and greatly influenced the effectiveness in regenerating the resins sorbed with ClO4−. Under such circumstances, a prefilter (≈ 0.5-1 {micro}m) was found to be necessary to remove these particulates and to reduce the risk of fouling of the resin beds. Without significant fouling, the resin bed could be effectively regenerated by the FeCl3 displacement technique. Nearly 100% of the sorbed ClO4− was displaced or recovered after elution with only ≈ 2-5 bed volumes of the FeCl3-HCl regenerant solution. On the basis of both the laboratory and field pilot-scale studies, they therefore anticipate that a combination of the selective ion exchange and the FeCl3-regeneration technologies may offer a cost-effective means to remove ClO4− from contaminated groundwater with significantly reduced waste generation and operational cost.
Book Synopsis Development of a Biological Process for the Treatment of Perchlorate in Ion-exchange Spent Brine by : Tanushree Hiremath
Download or read book Development of a Biological Process for the Treatment of Perchlorate in Ion-exchange Spent Brine written by Tanushree Hiremath and published by . This book was released on 2004 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Regeneration of Anion Exchange Resins by Catalyzed Electrochemical Reduction by :
Download or read book Regeneration of Anion Exchange Resins by Catalyzed Electrochemical Reduction written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Anion exchange resins sorbed with perchlorate may be regenerated by a combination of chemical reduction of perchlorate to chloride using a reducing agent and an electrochemical reduction of the oxidized reducing agent. Transitional metals including Ti, Re, and V are preferred chemical reagents for the reduction of perchlorate to chloride. Complexing agents such as oxalate are used to prevent the precipitation of the oxidized Ti(IV) species, and ethyl alcohol may be added to accelerate the reduction kinetics of perchlorate. The regeneration may be performed by continuously recycling the regenerating solution through the resin bed and an electrochemical cell so that the secondary waste generation is minimized.
Book Synopsis Water Purification by Ion Exchange by : T. V. Arden
Download or read book Water Purification by Ion Exchange written by T. V. Arden and published by Springer. This book was released on 1968 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an attempt to fill a gap in the existing literature on ion exchange. The many excellent works already available are of three main types, general introductions to the subject, specialist discussions of analytical and laboratory techniques, and advanced theoretical treatises. In practice, in spite of the vast number of processes which have been developed for la bora tory use, 99 per cent of all ion exchange resins produced in the world are used in water treatment, or closely allied applications. This book is intended as a general survey of the principles governing the practical uses of ion exchange resins, for the benefit of students encountering the subject for the first time, and for the chemists and engineers in many branches of industry whose work brings them into contact with water treatment, but who do not have the time to study more advanced volumes of basic theory. The background presented has been simplified to the maximum extent found possible without falsification, and an attempt has been made to relate each aspect of theory to its practical consequences in full scale water treatment. Mathematical methods have been avoided and pictorial or graphical presentation methods used wherever possible. As the book is concerned with general principles, rather than details of any particular research work, references to original papers and patents have been omitted except in the cases of special processes, which have a single clearly defined origin.
Book Synopsis The Regeneration and Fouling of Bicarbonate-form Anion Exchange Resins by : Christopher Adam Rokicki
Download or read book The Regeneration and Fouling of Bicarbonate-form Anion Exchange Resins written by Christopher Adam Rokicki and published by . This book was released on 2013 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: It was confirmed that bicarbonate had a similar affinity for the resin as chloride. Multiple regeneration cycles of the resin found that the strength of the regeneration solution governed the ion exchange process, rather than the identity of the mobile-ion and that certain organic fractions, particularly within the 1000-1500 Da AMW fraction were remaining on the resin causing the resin to lose ion exchange capacity. Divalent cations were added to model waters to determine how solubility of carbonate minerals impacted fouling and it was found that while magnesium minerals are most soluble they tended to foul resin the most, due to direct interference with the resin rather than precipitation on resin. Wastewater treatment applications were investigated to investigate biofouling potential and a method to quantify biofouling by particle counting was investigated, and preliminary results showed mobile-ions had minimal impact on biofouling of resins. This dissertation provides an understanding on how the regeneration process can impact the performance and fouling of resin when used for NOM removal.
Book Synopsis Investigation of Anion-exchange Resins for Removal of Perchlorate from Drinking Water by : Kristina Seley
Download or read book Investigation of Anion-exchange Resins for Removal of Perchlorate from Drinking Water written by Kristina Seley and published by . This book was released on 2005 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reviews and assesses ion exchange as a method for removing perchlorate (ClO4−) from supply wells in southern Santa Clara County, California. The feasibility of using Purolite anion-exchange resins A-530E (polystyrenic bifunctional), A-500 (polystyrenic), and A-860 (polyacrylic) was investigated, with A-530E found to be most effective for perchlorate removal in the presence of competing anions.
Book Synopsis A Comprehensive Method of Ion Exchange Resins Regeneration and Its Optimization for Water Treatment by : Sameer Al-Asheh
Download or read book A Comprehensive Method of Ion Exchange Resins Regeneration and Its Optimization for Water Treatment written by Sameer Al-Asheh and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ion exchange membranes, specifically resin technology, lie at the heart of electrolytically conductive systems used in the treatment of wastewater. This chapter deals with ion exchange deionization and the effect of resin amount as well as the concentration of acid and base on the product conductivity. The strong acidic cation polymeric exchanger resin is commercially called MERCK 104765 cation exchanger IV with capacity greater than 3.2 mmol/ml, while the strong basic anion polymeric exchanger resin is commercially called MERCK 104767 anion exchanger III with capacities greater than 1.0 mmol/ml. Water conductivity, as an indicator of regeneration efficiency, was monitored over time at the different conditions and scenario. In general, it was observed that the conductivity decreases with time until one point is reached and then starts to increase as a result of resin saturation. It was also noticed that the lowest conductivity is achieved when using 1-vol% NaOH and 5-vol% HCl in the cathodic and anodic resin tubes, respectively, and that water conductivity increases with the increase in the amount of water being used. The amount of resin significantly impacts the deionization efficiency; more ions are removed as the amount of resin increases.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2018 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Perchlorate written by Baohua Gu and published by Springer Science & Business Media. This book was released on 2006-07-02 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a detailed description of perchlorate chemistry and recent advances in innovative remediation technologies for perchlorate contamination and their pros and cons Additionally, the first book to describe the natural occurrence of perchlorate and its unique isotopic signatures for environmental forensics and its detection in the environment, particularly the real-time analysis using surface enhanced Raman spectroscopy
