corrosive species and scaling in wells at olkaria ... - Orkustofnun

DEDICATION
I would like to dedicate this work to my parents, my late father Peter Opondo Mutanda and my late
mother Christine Nasike Opondo for showing me the way of school at a very early stage in life and to
all those who may not be mentioned here but who made immense contributions in my early schooling
life.
ACKNOWLEDGEMENTS
I would like to express my gratitude to Dr. Ingvar Birgir Fridleifsson, the Director, United Nations
University (UNU) Geothermal Training Programme (GTP) for having offered me the opportunity to
attend the MSc. Programme under the University of Iceland-UNU GTP co-operation programme and
for his encouragement and guidance throughout the entire course, but also to Mr. Lúdvík S.Georgsson
and Gudrún Bjarnadóttir of UNU (GTP) for being of great help whenever I needed it.
I extend my gratitude and indebtedness to my supervisors Prof. Stefán Arnόrsson and Mr. Sverrir
Thórhallsson for having been there the whole way and providing a very supportive environment for
my research along with much guidance. The lecturers at the University of Iceland provided a great
learning experience and my sincere gratitude to them. My sincere appreciation to Gestur Gíslason and
Grétar Ívarsson of Orkuveita Reykjavíkur for assistance with all the field work at Nesjavellir, to Dr.
Sigurdur Jakobsson for analysis and interpretation of infrared spectroscopy, to Ingvi Gunnarsson and
Jόn Matthίasson for analysis with the Inductively Coupled Plasma (ICP) and the Scanning Electron
Microscope (SEM) and Sigurdur Jόnsson for the X-Ray Diffraction spectra (XRD), to the staff of
Iceland Geosurvey (ISOR) and Orkustofnun (OS) with whom interaction was of great help. To Niels
Giroud for providing chemical data for Nesjavellir well fluids and Halldόr Ármannsson for chemical
data for Reykjanes and Svartsengi well fluids. Special thanks are extended to my fellow students with
whom interaction was very encouraging throughout my study.
I would like to thank institutions and organisations that funded and supported my studies; The
Government of Iceland through the UNU Geothermal Training Programme (UNU-GTP) and
Orkuveita Reykjavíkur (Iceland). To my employer, the Kenya Electricity Generating Company Ltd
(KenGen) for granting me study leave to carry out this study.
My deepest thanks to my wife, Eunice who played dad and mum during my long period of absence,
my daughters Christine Nasike, Esther Narotso, Lynn Nabwire all who had to bare with my long
absence. You all were of great encouragement whenever I phoned and talked to you. To almighty
God for keeping me in good health during my entire stay.
iv