|dc.contributor.author||Nkansah, Marian Asantewah||eng
|dc.identifier.isbn||978-82-308-2078-0 (print version)||eng
|dc.description.abstract||Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous persistent semi-volatile organic
compounds. They are contaminants that are resistant to degradation and can remain in the
environment for long periods due to their high degree of conjugation, and aromaticity.
PAHs are present in industrial effluents as products of incomplete combustion processes
of organic compounds. Petroleum, coal and shale oil contain extremely complex mixtures
of these PAHs, and their transport and refining process can also result in the release of
It is therefore prudent that such effluents are treated before discharge into the
In this project, different approaches to the treatment of PAHs have been investigated.
Hydrous pyrolysis has been explored as a potential technique for degrading PAHs in
water using anthracene as a model compound. The experiments were performed under
different conditions of temperature, substrate, redox systems and durations.
The conditions include oxidising systems comprising pure water, hydrogen peroxide and
Nafion-SiO2 solid catalyst in water; and reducing systems of formic acid and formic acid
/ Nafion-SiO2 / Pd-C catalysts to assess a range of reactivities. Products observed in GCMS
analysis of the extract from the water phase include anthrone, anthraquinone,
xanthone and multiple hydro-anthracene derivatives (Paper I).
In addition a modified version of the Nafion-SiO2 solid catalyst in water oxidising system
was tested; and reducing systems of formic acid and formic acid / Nafion-SiO2 / Pd-C
catalysts were adopted for the conversion of a mixture of anthracene, fluorene and
fluoranthene. The rate of conversion in the mixture was high as compared to that of only
anthracene (Paper II).
Also the use of LECA (Lightweight expanded clay aggregates) as an adsorbent (Paper
III) for PAHs (phenanthrene, fluoranthene and pyrene) removal from water has been successfully achieved as well as photodegradation (UV) studies of fluorene in different
aqueous media (Paper IV).||eng
|dc.publisher||The University of Bergen||eng
|dc.relation.haspart||Paper I: Nkansah, M. A., Christy, A. A. & Barth, T. (2011) The use of anthracene as a model compound in a comparative study of hydrous pyrolysis methods for industrial waste remediation. Chemosphere, Volume 84 (4): 403- 408. Full-text not available in BORA. The published version is available at: <a href="http://dx.doi.org/10.1016/j.chemosphere.2011.03.061" target="blank">http://dx.doi.org/10.1016/j.chemosphere.2011.03.061</a>||eng
|dc.relation.haspart||Paper II: Nkansah, M. A., Christy, A. A. & Barth, T. (2012) Catalytic oxidation and reduction of polycyclic aromatic hydrocarbons (PAHs) present as mixtures in hydrothermal media. Polycyclic Aromatic Compounds (In press). The paper is available at: <a href="http://hdl.handle.net/1956/6104" target="blank">http://hdl.handle.net/1956/6104</a>||eng
|dc.relation.haspart||Paper III: Nkansah, M. A., Christy, A. A., Barth, T. & Francis, G.W. (2012) The use of lightweight expanded clay aggregate (LECA) as sorbent for PAHs removal from water, Journal of Hazardous Materials, 217- 218: 360-365. Full-text not available in BORA. The published version is available at: <a href="http://dx.doi.org/ 10.1016/j.jhazmat.2012.03.038" target="blank">http://dx.doi.org/ 10.1016/j.jhazmat.2012.03.038</a>||eng
|dc.relation.haspart||Paper IV: Nkansah, M. A., Christy, A. A., Barth, T. Francis, G.W. (2012). Preliminary photochemical studies of fluorene in various aqueous media (Manuscript). Full-text not available in BORA.||eng
|dc.title||Environmental Remediation: Removal of polycyclic aromatic hydrocarbons Dissertation||eng
|dc.rights.holder||Copyright the author. All rights reserved||