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Showing 1 to 20 of 155 for “"chlorite"”.
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Investigating chlorite dismutase biocatalyst reuse using columns
… reuse, experiments were conducted on a chlorite dismutase biocatalyst modified with a strep tag; this reuse system allows the biocatalyst to bind to coated resin beads that can be reused in a column system. Chlorite dismutase treats chlorite to chloride and oxygen. Activity tests were …
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Removal of chlorite by reaction with ferrous iron
… concern regarding residual concentrations of chlorite and chlorate have resulted in limitations on applied chlorine dioxide dosages. This study describes the use of ferrous iron as a possible reducing agent for the elimination of residual chlorite from drinking water.
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Mining biological diversity to optimize chlorite dismutase for water treatment
… case. A diverse superfamily of enzymes, known as chlorite dismutases (Clds), catalyzes the final reaction of biological perchlorate reduction. The goal of this work was to mine the diversity within the Cld superfamily to identify a homolog that is well suited for water treatment. To find an …
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Evaluation of different powdered activated carbons in the control of chlorite ion
… to determine their performance in the removal of chlorite ions (ClO₂⁻) and in the production of chloride ions (Cl⁻) and chlorate ions (ClO₃⁻) during that removal. All screenings were conducted in reagent water, at pH 7.0 ± 0.2 pH units, with a standard concentration of 20 mg/liter of powdered …
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Evaluation of the use of ferrous iron for chlorite removal under alkaline pH conditions
… risks due to the disinfection-by-products of chlorite and chlorate. The main objective of this project was to study the removal of chlorite by reaction with ferrous iron under elevated pH conditions. The stoichiometry of the reaction was evaluated under the following conditions: solution pH of …
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Major and trace element characteristics of biotite and chlorite as proxies for gold ore mineralization
… and trace element characteristics of biotite and chlorite were analyzed from a representative collection of rock types of different degrees of alteration from the Pampalo deposit. The main aim of this study was identifying possible correlation of changes in the elemental composition of biotite and …
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Selective removal of NOx from catalytic cracking regenerator effluent using wet scrubbing with aqueous sodium chlorite solutions
… with the addition of an oxidizing agent (sodium chlorite). A series of experiments were conducted in a bench-scale packed bed, a bench-scale ejector Venturi scrubber, and a pilot-scale packed bed. Various operating parameters such as gas flow rate, liquid flow rate, pH, operating temperature, gas …
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Studies on the Mechanism of the Chlorination Reactions Catalyzed by Chloroperoxidase and by Horseradish Peroxidase With Chlorite
Chloroperoxidase catalyzes the dismutation of chlorite-forming chloride, chlorine dioxide, chlorate, and oxygen as products. Chloroperoxidase also catalyzes the decomposition of chlorine dioxide. Chloride, chlorate, and oxygen are the products of the decomposition of chlorine dioxide. The optimum …
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The tectonic relationships of the Hillabee Chlorite Schist and the adjacent rock units in southern Cleburne County, Alabama
… that are mapped in the block. The Hillabee Chlorite Schist, a low grade metamorphic unit lies conformable and the youngest unit in the Talladega block. Geochemical analysis indicates the origin to be in an island arc environment. The Coosa Block is thrust over the Talladega clock. The …
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Comparison of ion chromatography and flow injection analysis methods for monitoring chlorite and chlorate ions in drinking water
… water treatment require low level measurement of chlorite ion (CI0₂-) and chlorate ion (CI0₃-). This research investigated analysis of CI0₂- and CI0₃-; in drinking water by flow injection analysis with iodometric detection (FIA) and ion chromatography with conductivity detection (IC). Both the FIA …
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Chlorine dioxide by-products in drinking water and their control by powdered activated carbon
… of chlorine dioxide (CI02), chlorine, chlorite (CIO2), and chlorate (CI03) were evaluated following pretreatment of raw water by CI02 at water treatment plants in New Castle, Pennsylvania; Charleston, West Virginia; Skagit, Washington; and Columbus, Georgia. Chlorite and chlorate …
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The hydrothermal alteration of oceanic basalts by seawater
… and albite may be subsequently a1tered to chlorite. Plagioclase, in association with skeletal clinopyroxene, alters to chlorite and epidote. Olivine is pseudomorphed by chlorite, and clinopyroxene alters to actinolite. The glassy matrix alters to an intergrowth of actinolite and chlorite. …
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A chemical study of the silicate minerals of the Great Gossen Lead and surrounding rocks in southwestern Virginia
… than 4 kbar. Fine- to medium-grained garnet-chlorite-biotite-quartz-muscovite schists and gneisses predominate. Other lithologies include thin layers of hornblende amphibolite, sulfide ore, quartz veins, thin layers of hornblendic gneiss, marble lenses and minor solution cavities. The …
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Clay petrology of Mesozoic to recent sediments of central western North Island, New Zealand
… predominance in the same samples of illite and chlorite in coarser fractions but of montmorillonite and kaolinite in finer fractions emphasises that the geologic interpretation of clay mineral distributions in sediments may be significantly influenced by the grain size fraction chosen for …
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Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield
… replaced, was associated with the formation of chlorite in and immediately around the VCR-Chlorite thermometry suggests a temperature of 307 ± 14°C for this event. The close mineralogical association of gold with chlorite, secondary pyrite and secondary quartz in the VCR is interpreted to …
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Chlorine dioxide and by-products in water distribution systems
… dioxide is associated with its byproducts chlorite and chlorate. Chlorine dioxide, chlorine, chlorite and chlorate were sampled in four distribution systems where chlorine dioxide is used for disinfection purposes: Charleston, WV, Columbus, GA, New Castle, PA, and Skagit, WA. The fate of …
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Petrology of the Ashe Formation, Shortt's Knob area, Floyd County, Virginia
… generally N 80° E, >50°SE. Amphibolites (39%), chlorite schists (8%), and quartzofeldspathic schists and gneisses (53%) are the major lithologies. Amphibolite assemblages are hornblende + clinozoisite and/or epidote + plagioclase + sphene ± quartz ± garnet. Amphibolites may be divided into four …
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Comparing Ferrous Chloride and Ferrous Sulfate as Secondary Coagulants at the Beaver Water District Drinking Water Treatment Plant
… byproducts (DBPs). Because ClO2 is reduced to chlorite (ClO2-), a regulated inorganic DBP, BWD incorporated ferrous salt into their coagulation regime to quench chlorite to chloride. In this study, two ferrous salts - ferrous chloride (FC) and ferrous sulfate (FS) - were compared as secondary …
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Reduction of odors associated with chlorine dioxide applications to drinking water
… by the entire panel. The removal of residual chlorite from drinking water would block a mechanism by which chlorine dioxide may be reformed from reactions between residual chlorite and free chlorine added for distribution system residual maintenance. Chlorite was removed by powdered activated …
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Selective Reduction of Laterite Ore
… detected by XRD in the original ore included chlorite, talc, hematite and quartz. Traces of iron silicate, Fe-Cr spinel and monoxide phase were observed by EDS. Nickel was detected in chlorite, talc, iron silicate and monoxide. At 600 °C, dehydroxylation of chlorite occurred. Chlorite was …
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