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Segun Ajayi Akinyemi

Postgraduate Students - PhD Students

sakinyemi  Segun Ajayi Akinyemi

  Programme: Applied Geolgy 

  Supervisors: Prof. L.F. Petrik

                     Dr A. Akinlua and

                     Dr W. M. Gitari

  Tel: +27 (0)21 959 2683

  Fax: +27 (0)21 959 3878

  Mobile: +27 (0)72 510 4826

  Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

PhD project title: Geochemical and mineralogical evaluation of toxic contaminants mobility in weathered coal fly ash: as a case study, Tutuka dump site, South Africa.

Progress Report: PhD thesis submitted (May 2011)

Abstract

The management and disposal of huge volumes of coal combustion by products such ash fly ash generated from coal combustion process has constituted a major challenge to the environment. In most cases due to the inadequate alternative use of coal fly ash, the discarded waste is stored in holding ponds, slag heaps, or stock piled in ash dumps. This practice has raised concerns on the prospect of inorganic metals release to the surface and groundwater in the vicinity of the ash dump. Acceptable scientific studies are lacking to determine the best ash disposal practices. Moreover, knowledge about the mobility patterns of inorganic species as a function of mineralogical association or pH susceptibility of the dry disposed ash dump under natural weathering conditions are scarce in the literature. Fundamental understanding of chemical interactions of dry disposed ash with ingressed CO2 from atmosphere, percolating rain water and brine irrigation within ash disposal sites was seen as a key area requiring investigation. The mineralogical association of inorganic species in the dry disposed ash cores can be identified and quantified. This would provide a foundation for understanding of chemical weathering, mineralogical transformations or mobility patterns of these inorganic species in the dry ash disposal scenario. The current study therefore aims to provide a comprehensive characterisation of weathered dry disposed ash cores, to reveal mobility patterns of chemical species as a function of depth and age of ash, and towards assessing the potential environmental impacts.


Curriculum Vitae of Segun Ajayi Akinyemi: B.Sc (Hons.), M.Sc (UWC)

Personal Information  

State & Local Govt. of Origin: Ekiti State, Ado Local Govt.  

Nationality: Nigerian  

Place of Birth: Ado Ekiti, Ekiti State, Nigeria  

Sex: Male  

 

Educational Background

2009-Date: University of the Western Cape, Bellville, Cape Town. South Africa

 PhD Applied Geology (PhD Thesis submitted on the 19th May 2011).  

2005-2008: University of the Western Cape Bellville, Cape Town. South Africa.

 M.Sc in Applied Geology (September 2008)  

1990-1995: University of Ado-Ekiti (formerly Ondo state university), Ado-Ekiti, Ekiti state Nigeria.

 B.Sc.(Hons) Geology Second Class-Upper Division  

1989: School of Remedial and Basic Sciences, Akure.Ondo State, Nigeria

 GCE/WASC 'O' Level Certificate 

1984-1988: Mayhill Boys’ High School Ado-Ekiti, Nigeria.

 GCE/WASC 'O' Level Certificate,

 

Personal Skill and Professional Proficiency  

Computer Proficiency and Instrumentation: 

Word Processor: MS Word and Adobe PageMaker.  

Spreadsheets: MS Excel, Micro Cal Origin, and SPSS, Statistica.  

Graphic & Drawing: CorelDraw, MS PowerPoint, Sigma Plot, Grapher 7 and ChemSketch  

Mapping Software: Surfer® 7&8, CPS-3, Stratlog, Kingdom software and Petrel 2005.  

Good theoretical and practical knowledge of Analytical instruments; such as Atomic Absorption Spectrometer(AAS), GFAAS, ICPOES, ICPMS, X-Ray Flourescence(XRF), Fourier Transform Infrared spectrophotometer (FTIR), X-Ray  

Diffraction (XRD), Gas Chromatography Mass Spectrometry (GCMS). 

 

Work Experience  

Lecturer in Geology Department University of Ado-Ekiti. Nigeria (2008 to Date).  

Doctoral Researcher in Environmental and Nanosciences Group, Chemistry Department, University of the Western Cape, South Africa. (2009-2011)  

Senior Teaching Assistant (Undergraduate Courses), and Current PhD student Earth Sciences Department, University of the Western Cape, South Africa. (2009-Date).  

NYSC Geologist in Exploration Evaluation Department, Shell Petroleum Development Company Nigeria Limited (1995-1996).  

 

Projects/ Workshops Undertaken with Dates  

Akinyemi, S. A. 2011. Geochemical and mineralogical evaluation of toxic contaminants mobility in weathered coal fly ash: as a case study, Tutuka dump site, South Africa. Unpublished PhD thesis, Earth Sciences Department, University of the Western Cape. South Africa  

Akinyemi S. A. 2008. Optimization of selective extraction as a tool for geochemical mapping in the Southern Africa Region. Unpublished M.Sc Thesis, Earth Sciences Department, University of Western Cape, South Africa.  

 

Scientific publications & proceedings  

S. A. Akinyemi, A. Akinlua, W.M. Gitari and L.F. Petrik. Mineralogy and mobility patterns of chemical species in weathered coal fly ash. Energy Sources, Part A, 33:768–784. 

Akinsehinwa Akinlua, Adeniyi S Adekola, Olwethu Swakamisa, Oluwaseun A Fadipe and S. A. Akinyemi. 2010. Trace Metals Characterisation of Cretaceous Orange Basin Hydrocarbon Source Rocks. Applied Geochemistry 25, 1587-1595.

A. Akinlua, A. Maende, S.A Adekola, O. Swakamisa, O.A Fadipe, S. A. Akinyemi. 2010. Source rock potential of selected Cretaceous shale samples from Orange basin, South Africa. International Geology Review, 1938-2839. 

S. A. Akinyemi, A. Akinlua, O.I. Ojo, W.M. Gitari, R.O. Akinyeye and L.F. Petrik. Metals mobility and partitioning in weathered coal fly ashes from coal burning power station in the Mpumalanga Province, South Africa. FUEL [Manuscript ID: JFUE-S-100037(1)] is currently under review.  

S. A. Akinyemi, A. Akinlua, W.M. Gitari, R.O. Akinyeye and L.F. Petrik. The leachability and chemical speciation of major elements at different stages of weathering in coal fly ash. Coal Combustion and Gasification Products [Manuscript ID: CCGP-S-1000006.fdf] is currently under review.  

S. A. Akinyemi, A. Akinlua, O. I. Ojo, W.M. Gitari, R.O. Akinyeye and L. F. Petrik. Mineralogy and mobility pattern of trace metals in brine irrigated dry disposed, weathered coal fly ash. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. [Manuscript ID-UESO-2011-0294].  

S. A. Akinyemi, A. Akinlua, W.M. Gitari, R.O. Akinyeye and L. F. Petrik. ‘Mobility and chemical partitioning of As, B, Cr, Mo, Pb and Se in weathered coal fly ashes. Applied Geochemistry [Manuscript ID: APGEO S-10-00242(2)] is currently under review.  

S. A. Akinyemi, A. Akinlua, O.I. Ojo, W.M. Gitari, R.O. Akinyeye and L.F. Petrik. Metals mobility and partitioning in weathered coal fly ashes from coal burning power station in the Mpumalanga Province, South Africa. FUEL [Manuscript ID: JFUE-S-100037(1)] is currently under review.

S. A. Akinyemi, A. Akinlua, W.M. Gitari and L.F. Petrik. 2009. Mineralogy and mobility patterns of chemical species in weathered fly ash. Paper presentation at International Conference on Coal Science and Technology, Cape Town.  

Xu Jingjing, Yang Jade, S. A. Akinyemi 2006. Optimization of selective extraction for prospecting in concealed ore mineralization: A case study in Morokweng impact structure South Africa. Geochemistry, Aqueous (Posters). Philadelphia Annual Meeting.  

Xu J., Yang J., Langa N., S. A. Akinyemi & C. D. Okujeni. 2005. Surface geochemical investigation of transported aeolian overburden for base metal exploration in Morokweng Impact Structure, North West, South Africa (Poster for GEO 2005, Conference. Durban, South Africa.  

 

Internal Reports (Technical) 

L. F. Petrik, W. Gitari, O. Etchebers, V. R. Kumar Vadapalli, J. Nel, O. Fatoba, A. Nyamihingura, S.A Akinyemi and M. J. Antonie (2007). Towards the Development of Sustainable Salts Sinks: fundamentals studies on the co-disposal of brines within Inland Ash Dams. 3rd Interim Progress Report submitted to Eskom/Sasol South Africa.  

 

Distinctions and Award  

Best Graduating Student, Department of Geology Ondo State University, (Now University of Ado-Ekiti) Ado-Ekiti, Nigeria (1995).  

Best Graduating Student, Petroleum Geology Course Ondo State University, (Now University of Ado-Ekiti) Ado-Ekiti, Nigeria (1995).  

Best Graduating Student, Faculty of Science Ondo State University, (Now University of Ado-Ekiti) Ado-Ekiti, Nigeria (1995).  

Deutscher Akademischer Austauch Dienst (DAAD), In country-In-Region Scholarship (2005-2007).
 

Membership of Professional Bodies  

America Association of Petroleum Geologist(AAPG) - Member  

Society of Petroleum Engineers (SPE) - Member  

Geological Society of South Africa (GSSA) - Member  

Nigeria Association of Petroleum Explorationist(NAPE) - Member  

Nigerian Mining and Geosciences Society (NMGS) - Member  

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