Results 251 to 260 of about 4,690,273 (294)
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Effect of pre-oxidation on reactivity of chars in steam
Fuel, 1982Abstract The effects of pre-oxidation of char from Taiheiyo coal, a non-caking bituminous coal, in the 400–550 °C temperature range on its gasification reactivity with N 2 -H 2 O at 0.1 MPa (steam partial pressure of 13.2 kPa) have been investigated. The pre-oxidation of char markedly enhances gasification rates at temperatures between 800 and 900 °C.
Kenichi Gomi, Yukio Hishinuma
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The pre-oxidation kinetics and mechanism of sulfapyridine for biodegradability improvement
Journal of Cleaner Production, 2021Abstract Oxidation of sulfapyridine (SPY) by typical oxidant, hydrogen peroxide (H2O2) and/or potassium peroxydisulfate (PDS), was used as a pre-treatment for antibiotic wastewater. The degradation dynamics showed that SPY was successfully removed, and the trend was fitted to the first-order reaction kinetics.
Pengcheng Yao +3 more
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Pre-oxidation strategies for biofiltration performance improvement
Journal of Water Process Engineering, 2018Abstract This study examined the impact of ozone (O3) and hydrogen peroxide+ozone (H2O2+O3) on organic matter and subsequent DOC and DBP precursor uptake across biofilters. Organic matter fractionation, using liquid chromatography – organic carbon detection (LC-OCD), confirmed that both O3 and H2O2+O3 oxidized high molecular weight fractions ...
Balsher Singh Sidhu +3 more
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Effect of pre-oxidation on the kinetics of reduction of ironsand
Journal of Alloys and Compounds, 2017Abstract The kinetics of reduction raw and pre-oxidized ironsand with hydrogen was studied using a combination of thermogravimetric analysis technique and microstructural characterization. Temperature range of 1073–1273 K (800–1000 °C) and H 2 partial pressure of 0.1–1.0 atm were covered. It was found that the reaction is first order with respect to
Zhenyang Wang +4 more
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Assessment of enhancement in biodegradation of dichlorodiethyl ether (DCDE) by pre-oxidation
Water Research, 2004The objective of this study is to assess the enhancement in biodegradation of dichlorodiethyl ether (DCDE) by ozonation and Fenton treatment. Acclimated and non-acclimated sludge cultures were used to test the biodegradability of the preoxidized DCDE solutions by three different tests: Short-term and long-term respirometry through continuous monitoring
Milica, Kaludjerski, Mirat D, Gurol
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The Influence of Pre-Oxidation on the Processing of Silicon Powder
1992Silicon powder is readily oxidised during milling in aqueous media at pH > 5 to yield colloidal silicon dioxide which during drying deposits as a thin film on silicon particle surfaces. Interaction between the films causes strong agglomeration in compacted powders, leading to inhomogeneity in the silicon particle packing which is retained during the ...
R. G. Stephen, F. L. Riley
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Pre-oxidation of an extremely polluted industrial wastewater by the Fenton?s reagent
Journal of Hazardous Materials, 2003The pre-oxidation of an extremely polluted pharmaceutical wastewater (chemical oxygen demand (COD) value of 362,000mg/l) using the Fenton's reagent has been systematically studied using an experimental design technique. The parameters influencing the COD removal of the wastewater, namely temperature, ferrous ion and hydrogen peroxide concentrations ...
Nora, San Sebastián Martínez +3 more
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Sulphide formation after pre-oxidation of chromia formers
Corrosion Science, 1996Abstract Pure chromium and the alloys Fe-28Cr, Co-28Cr and Ni-28Cr (wt%) were pre-oxidized in CO-CO2-N2 at 1173K and then reacted with CO-CO2-SO2-N2 mixtures. All gases had the same oxygen and carbon activities. The SO2-containing gases had sulphur activities higher than the chromium-chromium sulphide equilibrium value, but Cr2O3 was always predicted
X.G. Zheng, D.J. Young
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Comparison on Permanganate and Ozone as Pre-Oxidation Agents
Advanced Materials Research, 2014Comparative study on permanganate and ozone as pre-oxidation agents were performed on pilot scale with traditional drinking water treatment process, chemical oxygen demand (COD), total organic carbon (TOC), UV254, turbidity, trihalomethane formation potential (THMFP) were examined at each reactor’s effluent.
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