By Moses Alieze Chukwu
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A GIS based approach to investigating the potential of herbaceous bioenergy feedstocks for cellulosic bioethanol production in Nigeria By Moses Alieze Chukwu (B.Eng, Chemical Engineering, MSc, Sustainable Chemical Engineering) Thesis submitted for the Degree of Doctor of Philosophy Faculty of Science, Agriculture & Engineering Newcastle University, Newcastle Upon Tyne NE1 7RU United Kingdom November 2018 Declaration The content of this PhD thesis is my original work and was never presented in any part of the world for any purpose. I also wish to state that there is no collaboration of any sort in this study, be it publish or not. i Abstract Cellulosic ethanol provides a global alternative transport fuel to substitute conventional fossil fuels. The Nigerian Biofuel Policy in 2005 mandated the production and blending of gasoline with 10% bioethanol. Although, there have been indications that Nigeria has sufficient land available for 1st generation biofuel production, there is an urgent need to achieve food security for an increasing population. To these effects, this study aimed to investigate the land requirement and production potential of purposely grown herbaceous energy crops for 2nd generation cellulosic ethanol production in the six geo-political zones and states of Nigeria to meet the government Biofuel Policy. In this study, ArcGIS software was first used to identify two target land use classes (grassland and shrubland) with the potential for cellulosic ethanol production. The two land use classes were evaluated both on a regional and state basis. The study further employed a GIS-based multi-criteria decision method to determine land suitability for four herbaceous bioenergy crop species (Alfalfa, Elephant grass, Miscanthus x giganteus and Switchgrass). Suitability analysis was conducted using literature-based criteria weights for temperature, rainfall, soil organic matter, soil pH, slope and elevation by zone and state. The study further integrated Python software with ArcGIS to evaluate biomass productivity of the 4 species, where the NE zone was found to record the overall highest potential across the country, the SW was the highest in the South while SE zone generally possessed the least potential for all species. Estimates of productivity by state showed that Borno is the most potential productive state in the North and Oyo in the South. Lagos, which is largely comprised of built up areas, is the state with the least potential. In terms of crop productivity, elephant grass showed highest production potential followed by Miscanthus x giganteus and switchgrass while the C3 species (Alfalfa) has the least potential. The theoretical ethanol yield based on cellulose content of each bioenergy crop showed that at a national level, elephant grass has the greatest potential of the four species at 338 billion litres production per annum, which can power 735 large-scale cellulosic ethanol processing facilities. Generally, the study demonstrated that Nigeria will require the construction of multiple process facilities in order to be able to sustainably use the potential feedstocks available. Furthermore, the study showed that Nigeria has the potential to produce about 66 billion litres of cellulosic bioethanol per annum from the range of feedstocks evaluated. It is to this effect that the study indicated that Nigeria could potentially exceed the proposed 10% biofuel target of about 2 billion litres per annum using purposely grown herbaceous energy crops for cellulosic ethanol production. ii Dedication I dedicate this PhD thesis to my late brother who worked tirelessly to make my dream come true. iii Acknowledgements I am very grateful to my supervisors, Dr Paul Bilsborrow and Dr Carmen Hubbard, for their support throughout the period of this study. My special thanks goes to my lovely wife and children, Mrs Miriam Nneka Chukwu, Miss Gloria Ifechi, David, Kayla and Bella for their support, patience, understanding and prayers throughout the period of this study. I also wish to appreciate my Mothers, Mrs Comfort Chukwu and Mrs Monica Okeh, my sisters, Mrs Monica Ogbaronya and Chinweikpe Nkwagu, and my entire family members for their prayers and support throughout the periods of my study. I also wish to thank my Guardians and mentor, Chief Clement Nweke, Prof Mike Otuma and Prof Eugene Nweke, for their guidance and supports. Above all, I thank God Almighty for been the centre of this study. iv Acronyms AADL Allied Atlantic Distilleries Ltd AAEA Africa Albers Equal Area Conic AGO Automotive Gasoline Oil AHP Analytical Hierarchical Process AMN Administrative map of Nigeria ASCII American Standard Code for Information Interchange AT Attribute Table CBN Central Bank of Nigeria CF Critical Factors CDM Clean Development Mechanism CO2 Carbon Dioxide CH4 Methane DPR Department Petroleum Resources DEM Digital Elevation Model E 10 Ten Percent (10%) Ethanol Blending with 90% Gasoline EIA US Energy Information Administration EU European Union FAO Food and Agricultural Organisation of the United Nations FCT Federal Capital Territory FDAPHS Federal Department of Animal Production & Husbandry Services FMARD Federal Ministry of Agriculture and Rural Development GDP Gross Domestic Product GDB Geo-data Base GHG Greenhouse Gas Emission GIS Geographical Information System GLCN Global Land Cover Network HFC Hydrofluorocarbon HIS Healthcare Information Systems v IAASTD International Assessment of Agricultural Knowledge, Science and Technology for Development IEA International Energy Agency IPCC Intergovernmental Panel for Climate Change KRPC Kaduna Refinery and Petrochemicals LU Land Use LUC Land use change LULC Land Use Land Cover MCE Multi-Criteria Evaluation MCDM Multi-Criteria Decision Method MT Metric Tonnes NAAS Nigerian Annual Abstract of Statistics NAPRI National Animal Production Research Institutes NBS National Bureau of Statistics Nigeria NC North Central zone NE North East zone NIMET Nigerian Meteorological Agency NNPC Nigerian National Petroleum Cooperation NO2 Nitrogen Oxide NPFS Nigeria Programme for Food Security NRCS Natural Resources Conservation Service NW North West zone PMS Petrol Motor Spirit PRPC Port Harcourt Refinery and Petrochemical Company PTW Pump to wheel PWCM Pairwise Comparison Matrix RFA Renewable Fuels Association SAW Simple Addictive Weighting SE South East zone SF6 Sulphur Hexafluoride vi SRTM Shuttle Radar Topography Mission SS South South zone SW South West zone TOPSIS Technique for Order Preferences by Similarity to the Ideal Solution UN United Nations UNCTAD United Nations Conference on Trade and Development UTM Universal Transverse Mercator USA United States of America USDA United States Department of Agriculture WGS84 World Geodetic Survey 1984 WPM Weighted Product Method WRPC Warri Refinery and Petrochemical Company WSM Weighted Sum Method WTW Well-to-Wheels WTP Well to Pump vii Table of contents Declaration .................................................................................................................................. i Abstract ...................................................................................................................................... ii Dedication ................................................................................................................................ iii Acknowledgements ................................................................................................................... iv Acronyms .................................................................................................................................. vi Table of contents .................................................................................................................... viii List of Tables .......................................................................................................................... xiv List of Figures ........................................................................................................................ xvii Chapter 1: Introduction .............................................................................................................. 1 1.1 Background of the study ............................................................................................. 1 1.1.1 The role of agriculture within the Nigerian economy ............................................. 1 1.1.2 The energy sector .......................................................................................................... 2 1.1.2.1. Crude oil production in Nigeria ................................................................................ 3 1.1.2.2. Refining and Petrochemical Companies in Nigeria .................................................. 4 1.1.3 Transport fuel (Petroleum products) import in Nigeria ................................................ 5 1.1.3.1 Transport fuel (PMS and AGO) import and consumption in Nigeria ........................ 6 1.1.4 Climate change and CO2 emission from the transportation sector ................................ 7 Chapter 2: Literature Review ............................................................................................... 11 2.1 What are biofuels? .......................................................................................................... 11 2.1.1 First generation bioethanol .......................................................................................... 11 viii 2.1.2 Second generation bioethanol production ..................................................................