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Showing 1 to 11 of 11 for “"Sulfide Oxidation"”.
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Kinetics of Hydrogen Sulfide Oxidation in Sanitary Sewer Systems
… of temperature of 12 oC and 14 oC and pH 7, the oxidation of H2S with FeCl2 adheres to second-order reaction kinetics. The removal of H2S using H2O2 is well described by the third-order kinetic for a temperature range between 10 oC and 17 oC and pH 7. H2S oxidation by the combination of FeCl2 and …
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Development, uncertainty quantification, and reduction of a dimethyl sulfide oxidation mechanism
Dimethyl sulfide (DMS), arising from phytoplankton, is the largest natural source of sulfur in the atmosphere. The oxidation products of DMS, such as methanesulfonic acid and sulfuric acid, can contribute to cloud condensation nuclei. Studying the oxidation mechanism of DMS will help improve our …
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Hydrometallurgical processing of nickel sulfides with activated carbon in sulfuric acid medium
… metal sources. Conversely, among these, sulfide‑rich mine flotation tailings are of particular significance, as they represent both a long‑term environmental liability and a potentially valuable repository of unrecovered metals. This dissertation investigates nickel sulfide flotation …
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Using 34-S as a Tracer of Dissolved Sulfur Species from Springs to Cave Sulfate Deposits in the Cerna Valley, Romania
… springs have high concentrations of dissolved sulfide gas (H2S) and dissolved sulfate (SO4²-).These dissolved species indicate the progression of sulfate reduction in the aquifer. Water samples were collected in polyethylene syringes to prevent oxidation of sulfide. Then, sulfide and sulfate …
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Effect of Various Saturation Levels, Leaching Solution pH, and Leaching Cycle on Electrical Conductivity from Coal Mine Spoil Leachate
… cations by potentially affecting trace sulfide oxidation and carbonate dissolution reactions. Little evidence of saturation was noted with the standard method. Leaching solution bulk chemistry did not alter leachate chemistry. Longer times between dosing cycles corresponded to higher EC, …
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Electron Transfer Processes between Hydrogen Sulfide and Humic Substances - Implications for Anaerobic Sulfur Cycling in Freshwater Ecosystems
… humic substances. The interactions between sulfide, sulfate (SO42-) reduction, methanogenesis, and organic matter (OM) redox processes were investigated in controlled abiotic and biotic incubation experiments. In the first study, we investigated the abiotic transformation of sulfide upon …
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Geochemical Reactions in Unsaturated Mine Wastes
… spaces in the waste piles. The rate of pyrite oxidation in moist air was determined by measuring over time the change in pressure between a sealed chamber containing pyrite plus oxygen and a control. The experiments carried out at 25?C, 96.8% fixed relative humidity, and oxygen partial …
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Biochemical characterization of respiratory chain flavoproteins
… (NDH-2) from Streptococcus agalactiae • The sulfide:quinone oxidoreductase (SQR) from the archaeon Caldivirga maquilingensis • The NDH-2 from Thermus thermophilus, now re-classified as a coenzyme A disulfide reductase (CoADR) NDH-2 catalyzes the same reaction (NADH:quinone oxidoreductase) as …
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A prototype dynamic model for the co-treatment of a high strength simple-organic industrial effluent and coal-mine drainage
… for the recovery of elemental sulfur (S0 ) from sulfide and 2) ferrous biological oxidation reactor to regenerate ferric from the ferrous for re-supply to the ABS unit. The datasets generated in the experimental study allowed for the identification, mathematical modelling and reaction …
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Importance of Sulfide, Polysulfides, and Elemental Sulfur for Abiotic and Biotic Redox Processes in Sulfur-Metal(loid)Systems
… element in the environment, occurs in different oxidation states from +6 to -2. Between the thermodynamically stable end members sulfate and sulfide, a variety of intermediate sulfur species exist, examples of which are sulfite, polythionates, thiosulfate, elemental sulfur, and polysulfides. …
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Quantifying texture for acid rock drainage characterisation and prediction
… a complex series of acid formation (mainly via sulfide oxidation), neutralisation (primarily by carbonates) and gangue mineral dissolution reactions in waste rock and tailings storage piles. The resulting drainage waters are often acidic, highly saline and may contain elevated levels of …