Download or read book Absorption of Sulfur Dioxide from Coal Gas Cleanup with Conversion to Polymeric Ferric Sulfate for Use in Water Treatment written by Aron D. Butler and published by . This book was released on 2002 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Absorption of sulfur dioxide from a mixed gas stream was investigated by sparging it into a bench-scale reactor containing a stirred solution of ferrous sulfate with sodium chlorate added as an oxidant. The reaction product was a solution containing approximately 50 wt-% polymeric ferric sulfate (PFS), a highly effective coagulant useful in treatment of drinking water and wastewater. The reaction took place near atmospheric pressure and at temperatures of 30-80°C. S02 removal efficiencies greater than 90% were achieved with ferrous iron concentrations in the product less than 0.1%. A factorial analysis of the effect of temperature, oxidant dosage, SO2 concentration, and gas flowrate on SO2 removal efficiency was carried out, and statistical analyses were performed. The results suggest that S02 removal efficiency is improved by increasing the dosage of oxidant, while it is reduced by an increase in temperature. It is postulated from reaction stoichiometry that the iron reaction is more competitive for the available oxidant at the higher temperatures, which reduced desulfurization efficiency. The product solution was evaluated by wet chemistry methods to verify that the process was capable of consistently producing high quality PFS. Quality parameters examined were total iron concentration, ferrous iron concentration, basicity (mass ratio of OH/Fe(III)), density, and pH. It was found that the basicity of PFS could be adjusted by varying how long the absorption and oxidation of SO2 was continued after all the Fe(II) was converted to Fe(III). In addition, dried, powdered samples of PFS were analyzed by x-ray diffraction to determine whether drying temperature had an effect on relative crystallinities. All samples examined were highly amorphous, suggesting drying conditions had little influence on crystallinity. The PFS product was applied in pilot-scale tests at a municipal water treatment facility, and gave good results in removal of turbidity and superior results in removal of disinfection byproduct precursors (TOC, DOC, UV-254) when compared with equal doses of ferric chloride.
Download or read book SYNTHESIS OF SULFUR BASED WATER TREATMENT AGENT FROM SULFUR DIOXIDE WASTE STREAMS written by and published by . This book was released on 2001 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: We propose a process that uses sulfur dioxide from coal combustion as a raw material to synthesize polymeric ferric sulfate (PFS), a water treatment agent. The process uses sodium chlorate as an oxidant and ferrous sulfate as an absorbent. The major chemical mechanisms in this reaction system include oxidation, hydrolysis, and polymerization. Oxidation determines sulfur conversion efficiency while hydrolysis and polymerization control the quality of product. Many factors, including SO2 inlet concentration, flow rate of simulated flue gas, reaction temperature, addition rate of oxidant and stirring rate, may affect the efficiencies of SO2 removal. Currently, the effects of SO2 inlet concentration, the flow rate of simulated flue gas and addition rate of flue gas on removal efficiencies of SO2, are being investigated. Experiments shown in this report have demonstrated that the conversion efficiencies of sulfur dioxide with ferrous sulfate as an absorbent are in the range of 60-80% under the adopted process conditions. However, the conversion efficiency of sulfur dioxide may be improved by optimizing reaction conditions to be investigated. Partial quality indices of the synthesized products, including Fe{sup 2+} concentration and total iron concentration, have been evaluated.
Download or read book SYNTHESIS OF SULFUR BASED WATER TREATMENT AGENT FROM SULFUR DIOXIDE WASTE STREAMS written by Robert C. Brown and published by . This book was released on 2004 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Absorption of sulfur dioxide from a simulated flue gas was investigated for the production of polymeric ferric sulfate (PFS), a highly effective coagulant useful in treatment of drinking water and wastewater. The reaction for PFS synthesis took place near atmospheric pressure and at temperatures of 30-80 C. SO{sub 2} removal efficiencies greater than 90% were achieved, with ferrous iron concentrations in the product less than 0.1%. A factorial analysis of the effect of temperature, oxidant dosage, SO{sub 2} concentration, and gas flow rate on SO{sub 2} removal efficiency was carried out, and statistical analyses are conducted. The solid PFS was also characterized with different methods. Characterization results have shown that PFS possesses both crystalline and non-crystalline structure. The kinetics of reactions among FeSO{sub 4} {center_dot} 7H{sub 2}O, NaHSO{sub 3} and NaClO{sub 3} was investigated. Characterizations of dry PFS synthesized from SO{sub 2} show the PFS possesses amorphous structure, which is desired for it to be a good coagulant in water and wastewater treatment. A series of lab-scale experiments were conducted to evaluate the performance of PFS synthesized from waste sulfur dioxide, ferrous sulfate and sodium chlorate. The performance assessments were based on the comparison of PFS and other conventional and new coagulants for the removal of turbidity and arsenic under different laboratory coagulant conditions. Pilot plant studies were conducted at Des Moines Water Works in Iowa and at the City of Savannah Industrial and Domestic (I & D) Water Treatment Plant in Port Wentworth, Georgia. PFS performances were compared with those of conventional coagulants. The tests in both water treatment plants have shown that PFS is, in general, comparable or better than other coagulants in removal of turbidity and organic substances. The corrosion behavior of polymeric ferric sulfate (PFS) prepared from SO{sub 2} and ferric chloride (FC) were compared. Results showed that both temperature and concentration of the coagulants substantially impact corrosion rates. The corrosion rates increased with the increase of temperature and concentration. The results from a scanning electron microscope (SEM) showed that chloride caused more serious pitting than sulfate anion on both aluminum and steel specimens. Although SEM confirmed the existence of pitting corrosion, the results of weight loss indicated that the uniform corrosion predominate the corrosion mechanism, and pitting corrosion played a less important role. The test proved that PFS was less corrosive than FC, which may lead to the large-scale application of PFS in waste treatment. The kinetics of the new desulfurization process has been studied. The study results provide the theoretical guidance for improving sulfur removal efficiency and controlling the quality of PFS.
Download or read book Master s Theses Directories written by and published by . This book was released on 2003 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".
Download or read book Commencement written by Iowa State University and published by . This book was released on 2001 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process Development in Removing Sulfur Dioxide from Hot Flue Gases in Four Parts written by Daniel Bienstock and published by . This book was released on 1961 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flue Gas Desulfurization by the Modified Citrate Process written by R. H. Lien and published by . This book was released on 1979 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process Development in Removing Sulfur Dioxide from Hot Flue Gases in Four Parts written by Andrew G. Sharkey and published by . This book was released on 1963 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Use of Ferric Sulfate acid Media for the Desulfurization of Model Compounds of Coal written by Lloyd Robert Clary and published by . This book was released on 1980 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sulfur Oxides Control Technology Series written by and published by . This book was released on 1980 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Removing Sulfur Dioxide by Carbon Monoxide Reduction written by Larry A. Haas and published by . This book was released on 1971 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selective Adsorption and Recovery of Sulfur Dioxide from Industrial Gases by Using Synthetic Zeolites written by D. A. Martin and published by . This book was released on 1963 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Absorption of Sulphur Dioxide by Titania Gel written by Aloysius John Burggraff and published by . This book was released on 1927 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coal Processing Production and Properties written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1976 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Removing Sulfur Dioxide from Flue Gases written by Joseph W. Town and published by . This book was released on 1971 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling the Gas and Liquid phase Resistances in the Dry Scrubbing Process for Sulfur Dioxide Removal written by Marlin Kenneth Kinzey and published by . This book was released on 1988 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process Development in Removing Sulfur Dioxide from Hot Flue Gases in Four Parts written by Daniel Bienstock and published by . This book was released on 1967 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
