Degree Type

Dissertation

Date of Award

2008

Degree Name

Doctor of Philosophy

Department

Civil, Construction, and Environmental Engineering

First Advisor

J. (Hans) van Leeuwen

Second Advisor

Jacek A. Koziel

Third Advisor

Robert C. Brown

Abstract

Sulfur dioxide (SO2) is one of major air pollutants emitted from coal combustion. When it is emitted into the environment, it imposed many adverse health and environmental impacts, such as impairment of respiratory system, reduction of visibility and acid rain. Traditional sulfur dioxide removal technologies have the disadvantages disposal of large amount of by-products with low market value.;Fly ash, a by-product of coal combustion rich in iron and aluminum oxides and sodium chlorate as an oxidant were utilized in this project to produce a complex coagulant with the removal of sulfur dioxide in simulated flue gas. Conversion efficiency of iron and aluminum oxides in fly ash was temperature dependant. The removal efficiency of sulfur dioxide was influenced by reaction temperature, diffusing method, and sulfur dioxide initial concentration. The produced complex coagulant performed better in the removal of total suspended solid (TSS) and turbidity in wastewater treatment.;Investigations of reaction kinetics showed that the reaction orders of iron and aluminum oxides under the same reaction temperature are the same. Empirical Arrhenius expressions were derived based on rate constants at each reaction temperature. Reaction kinetics of iron and aluminum oxides in ground and unground fly ash were compared and analyzed. The mass transfer process of sulfur dioxide absorption was semi-quantified using a film model.

DOI

https://doi.org/10.31274/rtd-180813-16868

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Ling Li

Language

en

Proquest ID

AAI3307082

OCLC Number

243693072

ISBN

9780549543329

File Format

application/pdf

File Size

123 pages

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