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Department of Environmental Health

Academic Staff


DR. IR. SUNNY E. AIYUK: Environmental Health/ Public Health/ Project Management Specialist/ Engineer




Ph.D in Environmental Technology from the Ghent University, Belgium

Master in Advanced Management from the Free University of Brussels, Belgium

M.Sc. in Water Resources Engineering (Joint Degree Programme) from both the Free University of Brussels-Belgium and the Catholic University of Leuven, Belgium

M.Sc. in Applied Sedimentology & Petroleum Geology from the University of Nigeria, Nsukka-Nigeria

B.Sc. in Geology from the University of Yaounde, Cameroon

Certificate in Prevention & Management of Communicable Diseases (focus on Malaria) from the African Medical Research Foundation (AMREF), Nairobi, Kenya

Rank: Senior Lecturer and Dean of Faculty


Profile: I am a top-notch scholar who has published widely in the fields of Environmental Health, Public Health and Project Management. I am also an acclaimed RESEARCH AWARD Winner. I have supervised SEVEN Environmental Sanitation and Bio-Engineering Dissertations (2 Winning Country-Wide Industry Awards in Belgium), Co-supervised TWO M.Sc. Dissertations in Soil Science, and numerous B.Sc & B.A Dissertations.


Courses Taught: EHS 209-Water Supply & Sanitation; EHS303-Drainage Systems & Liquid Waste management; EHS308-Research Methods in Environmental Health;  EHS310-Environmental Pollution & Control; EHS407-Research Project; EHS408-Project Management & Entrepreneurship; EHS411-Occupational Health, Safety & Hygiene; CHS401-Communicable Disease Control; NUT405-Research Methods in Nutrition



Research Interests

Global Water Scarcity Issues & Innovative Management Approaches

Solid & Liquid Waste Management & Disposal

Environmental Protection/ Remediation Measures, Public Health & Safety

Communicable Disease Control

Sustainable & Renewable Energy & Climate Change

Business Communication & Marketing

(Financial) Project Management & Evaluation

Sustainable Development & Development Partnerships

Selected Publications

International Peer-Reviewed Publications

Aiyuk S.E., Raskin L., Van Haandel A. & Verstraete W. (2003). Development of a sustainable treatment technology for domestic sewage. Communications in Agricultural & Applied Biological Sciences 68 (2 Pt A), 135-139. 


Aiyuk S.E. & Verstraete W. (2004). Sedimentological evolution in an UASB treating SYNTHES, a new representative synthetic sewage, at low loading rates. Bioresource Technology 93 (3), 269-278.


Aiyuk S.E., Amoako J., Raskin L., Van Haandel A. & Verstraete W. (2004). Removal of carbon and nutrients from domestic wastewater using a low investment, integrated treatment concept. Water Research 38 (13), 3031-3042.


Among the 25 most requested Water Research articles worldwide, for the period April 2004 to March 2005.

For its very high environmental sustainability impact, this work was selected by the international editorial board & included in the Virtual Journal of Environmental Sustainability 2 (8), 2004.


Xu H., Aiyuk S.E., Zhang Y., Chen G., Pieters J. & Verstraete W. (2004). Stimulation of methanogenesis in a lab-scale UASB reactor treating domestic sewage by Fe (0) application. Environmental Technology 25 (5), 613-619.


Aiyuk S.E., Xu H., Van Haandel A. & Verstraete W. (2004). Removal of ammonium nitrogen from pretreated domestic sewage using a natural ion exchanger. Environmental Technology 25 (11), 1321-1330.


Verstraete W., Morgan-Sagastume F., Aiyuk S.E., Waweru M., Rabaey K. & Lissens G. (2005). Anaerobic digestion as a core technology in sustainable management of organic matter. Water Science & Technology 52 (1-2), 59-66.


Aiyuk S.E., Forrez I., De Kempeneer L., Van Haandel A. & Verstraete W. (2006). Anaerobic and complementary treatment of domestic sewage in regions with hot climates - A review. Bioresource Technology 97 (17), 2225-2241.


Aiyuk S.E, Odonkor P., Theko N., van Haandel A. & Verstraete W. (2010). Technical problems ensuing from UASB reactor application in domestic wastewater treatment without pre-treatment. Int. J. Env. Sci. Dev. 1 (5), 392-398.


Ranotsi A. & Aiyuk S.E. (2012). Impact of the pension on access to health and selected foodstuffs for pensioners of the Manonyane community in Roma, Lesotho, as measured between 2004 and 2006. Healthy Aging & Clinical care in the Elderly 4, 27-31.


Aiyuk S.E. & Torfs E. (2013). Knowledge & information management: Crucial driver of environmental sustainability (submitted for publication).



Other Publications

Aiyuk S.E., Nkoebe T.S. & Verstraete W. (2012). An integrated financial project decision model for characterizing and supplying irrigation water. Lesotho J. Agr. Sci. (Accepted for publication & in Press).
Zhang Y., Aiyuk S.E., Xu H., Chen G. & Verstraete W. (2005). Study of microbial community structures in UASB sludge treating municipal wastewater by denaturing gradient gel electrophoresis of 16S rDNA. Science in China Series C (Life Sciences) 48 (z1), 128-135.

Aiyuk S.E. (2012). Urbanisation “fingerprinting” on environment & health. Lesotho Med. Assoc. Journal 10 (1), 19-23.

Ramathebane M.V., Aiyuk S.E. & Maja L. (2012). Assessment of dispensing records in pharmacies of the health facilities in Lesotho. Lesotho Med. Assoc. Journal 10 (1), 30-34.

Ranotsi A., Makatjane T. & Aiyuk S.E. (2012). The extent of drug abuse in Lesotho: The case of mapoteng community. Lesotho Med. Assoc. Journal 10 (1), 11-18.

Aiyuk S.E., Ranotsi A., Ramathebane M. & Verstraete W. (2013). Dire global water crisis in a cultural theory grid. Swaziland J. Sust. Dev. (Accepted for publication & in Press).


Contacts: Office Ext: 7061; Cell: 59450338


Mr  P. Gwimbi:  Environmental Health/ Environmental Impact Assessment/ Environmental Toxicology/Climate change/ Environmental Policy




MA. Environmental Policy and Planning  (University of Zimbabwe)

BA. Honours Geography  (University of Zimbabwe)

Graduate Certificate in Education (University of Zimbabwe)

Certificate in GIS and Remote Sensing (The Royal Museum for Central Africa, Brussels, Belgium)

Rank: Senior Lecturer and Head of Department



Environmentalist with extensive knowledge and experience in:  Environmental Impact Assessment, Climate Change Impact Analysis, Community Based Waste Management, Environmental policy analysis.  Just completed and submitted my PhD thesis (Evaluation of the effectiveness of EIAs in mitigating impacts of mining projects along the Great Dyke of Zimbabwe) for marking. RESEARCH GRANT AWARD WINNER:  Southern Africa Climate Change Agricultural Model Inter-comparison and improvement Project (2013-2014);  African Climate Change (ACCFP) research fellow grant recipient (2012-2013), OSSREA Research Grant recipient (2012), OSSREA Research Grant recipient (2009). Wide university lecturing experience: (Zimbabwe Open University, Catholic University in Zimbabwe, Ethiopian Civil Service University, NUL). Has wide experience in EIA consultancies for:  mining, dam, urban residential, road and electricity power line projects; Climate change and climate smart agriculture research report writing.


Courses Taught

EHS 204-Environmental Determinants of Human Health;

EHS205-Rural and Urban Environments; 

EHS207-Global Warming and Climate Change;

EHS 307- Environmental Toxicology;

EHS309-Hazardous and Solid Waste Management;

EHS 410-Environmental Impact Assessment (EIA).

Research Interests

Environmental Impact Assessment

Environmental Toxicology

Climate Change

Hazardous Waste Management

Solid Waste management

Environmental Health Issues

Disaster Risk Reduction related issues


Selected Publications

Gwimbi P. (2013). Social Protection and Climate Change Adaptation in Lesotho: Opportunities and Constraints. In Devereux S., Getu M. (Eds). Informal and Formal Social Protection Systems in Sub-Saharan Africa; chapter 7,pp 159-176. Fountain Publishers, Kampala, Uganda. ISBN: 978-9970-25-241-1

Gwimbi P.,  Sithole N. (2012). The Ecology of crop raiding elephants in the Matusadonha National Park (Zimbabwe): Implications for community based wildlife conservation. Social Science Research Report Series No. 35; pp 59-81. ISSN 1608-6287


Gwimbi P. (2011). The microbial quality of drinking water in Manonyane community: Maseru District (Lesotho); African Health Sciences 2011;11(3): 474 – 480.


Masocha, M., Kativu, D., Gwimbi, P.(2011) Waste Management chapter, In Zimbabwe State of the Environment, Ministry of Environment and Tourism, Harare.


Gwimbi, P.(2009). Cotton farmers’ vulnerability to climate change in Gokwe District (Zimbabwe): impact and influencing factors, Journal of Disaster Risk Studies, Vol.2, No.2:81-92


Gwimbi, P. (2009). Linking rural community livelihoods to resilience building in flood risk reduction in Zimbabwe, Journal of Disaster Risk

Studies, Vol. 2, No.1:71 – 79


Gwimbi, P. (2008). Carrying out Environmental Impact Assessment in Zimbabwe: Challenges and prospects for consultants. Journal of African Development Studies, Vol.1. No.1: 60 – 71.


Gwimbi, P. (2007). The effectiveness of early warning systems in the reduction of flood disasters: some experiences from Cyclone induced floods in Zimbabwe, Journal of Sustainable Development in Africa, Vol.9, No.4: 152 -169.



Other Publications


Gwimbi P.(2011). Assessing the Vulnerability of Agriculture to Climate Change in Lesotho Food, Agriculture and Natural Resources Policy Analysis Network (FANRPAN).


Gwimbi P. (2007) Linking public risk knowledge and early warning systems to flood hazard resilience: The Case of Lower Muzarabani District (Zimbabwe),


Gwimbi, P. (2006). Southern Africa Regional Forum on Local perspectives on Disaster Risk Reduction in Africa(


Gwimbi, P., Dirwai, C. (2002) Research Methods in Geography and Environmental Studies, Zimbabwe Open University, Harare



Contacts:       Office Ext: 7065; Cell: 63311012

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Tšaletseng Siimane (Mrs)



MSc (Environmental Technology), University of Pretoria, 2006

BSc (Hons) (Environmental Technology), University of Pretoria, 2004

BSc (Biology and Chemistry), National University of Lesotho, 1999

Rank:     Lecturer




Mrs Siimane joined NUL in March 2014 and is currently serving as a Lecturer. From 2001 she worked in the Ministry of Health-environmental Health Division in various two capacities (Programme Manager for Pollution Control and as the National Health Care Waste Management Focal point).

In January 2013 she joined the Millennium Challenge Account-Lesotho (Health Sector Project) as a Medical Waste Management Specialist and was later appointed as the Project Manager for the project in January 2014.

Mrs Siimane has an MSc Environmental Technology degree from the University of Pretoria and a BSc (Biology and Chemistry) from the National University of Lesotho. She has been involved in several consultancy projects and has participated in some operational research activities since 2006.

Since joining NUL she has been involved in community outreach activities like cleaning campaign organization. She also is a member of the Lesotho DSQA Technical Committee 207 on Environmental Management responsible for standardization in the field of environmental management systems and tools in support of sustainable development.

Courses Taught

EHS 205-Urban and Rural Environments

EHS 208-Environmental Hazards and Disasters


Research Interests

Mrs Siimane’s main research interests focus on devising environmental health solutions for developing countries, focusing on environmentally sound technologies. Innovation is an important part of developing world technologies. She also has interest in operational research, in the field of environment and health, with particular emphasis on integration of environmental health services. Currently there are no on-going projects in these areas of interest.



Selected Publications

Siimane  T. (2007).  Application of the analytical hierarchy process to establish health care waste management systems that minimise infection risks in developing countries. European Journal of Operational Research Vol. 181 No. 1 Pg. 403-424



Tel: +266 2234 0601 (Ext 7117)

Cell: +266 5806 2546

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Hlabana Relebohile Gladys (Ms)


Qualifications:   BSc Biology and Chemistry (NUL)

Rank:     Laboratory Demonstrator



Miss Hlabana is an enthusiastic natural scientist with Biological and Chemical expertise. While still at the National University of Lesotho she volunteered to work in a government hospital during her school vacations. This is where Miss Hlabana learnt about drug resistance and need to find alternative sources of antibiotics to replace the synthetic ones to which human pathogens are becoming resistant; hence Miss Hlabana’s interest in researching on medicinal plants during her final year of study.


During the course of her research Miss Hlabana discovered that the medicinal plants of interest in Lesotho are facing extinction due to over-harvesting. This fact triggered her into establishing a non-governmental organization which would focus on overall management of natural resources. After registration of her organization, Miss Hlabana became the Project Manager to implement a “Plant Conservation Phase 1”project funded under European Development Fund. Her experience in this project proved to her need for more effort to seriously manage natural resources in Lesotho. That is where she decided to pioneer a programme (Lesotho Graduates Support Programme- LGSP) through which she would recruit natural resource managers, targeting National University of Lesotho (NUL) community and unemployed graduates.



She has taught Science at high school and has also been a laboratory demonstrator/technician at National University of Lesotho.


Contacts:             Office Ext: 7119;               Cell: +266 58834 957  

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Dip. Sci. Ed          (The National University of Lesotho)

BSc. Ed (The National University of Lesotho)

MSc. Eng - Water and Environmental Management (University of Kwa-Zulu Natal)


Position:              Lecturer

Teaching Responsibilities:  Environmental Pollution & Control; Water Supply and Sanitation; Drainage Systems and Liquid Waste Management; Environmental Health Laws & Environmental Inspection; Perspectives in Environmental Health


Professional Qualifications:

Land Use Change Management And Remote Sensing 2008

Integrated Water Resources Management 2006

Water Pollution Control & Water Resources Management 2006

Wetland Dynamics and Integrated Management Techniques 2004



I have a strong background in Integrated Water Resources Management, Water Quality; Water treatment and design; Environmental Management Systems; Environmental Awareness; Environmental Impact Assessment and Environmental Policy.



I have a broad experience in Environmental issues where focus has been on Environmental Awareness & Education at country level- (Lesotho), especially on natural resources Conservation and Management, Natural wetland protection; reconstruction, conservation & restoration measures and water quality.


Research interests:

Integrated Water Resources Management and implementation challenges

Waste management and challenges

Community based natural resource management

Effectiveness of EIA

Climate change and water resources

Contact Details

Tel: +266 22340601 Ext: 7072


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