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21 June 2021 | Story Dr Patricks Voua Otomo
Dr Patricks Voua Otomo
Dr Patricks Voua Otomo is the Head of the Ecotoxicology Research Laboratory and Subject Head: Zoology and Entomology in the Faculty of Natural and Agricultural Sciences at the University of the Free State (UFS).
The month of June is earmarked for the celebration of National Environment Month, with the South African government and captains of industry leading the way by stimulating awareness on environmental issues and challenging everyone to become agents for change. World Environment Day, the biggest annual event of the United Nations Environment Programme (UNEP), is commemorated on 5 June, with the aim of galvanising positive environmental action. The University of the Free State (UFS) – through researchers from the Afromontane Research Unit (ARU) housed on the Qwaqwa Campus of the UFS – is playing its part in the fight against pollution, and especially water pollution in the eastern Free State.

The ARU initiated a research project in 2021, focusing on the assessment of the quality of local natural water resources in order to foster sustainable development in Phuthaditjhaba, and because of the recurring challenges pertaining to water quality and quantity in the Maluti-a-Phofung (MAP) Local Municipality. For the first such project focusing exclusively on pollution issues in a select Afromontane region – led by Dr Patricks Voua Otomo, Head of the Ecotoxicology Research Laboratory and Subject Head: Zoology and Entomology in the Faculty of Natural and Agricultural Sciences – a vibrant team of ARU scientists and students set out to determine the ecotoxicological and bacteriological state of water resources in MAP. With the permission of MAP, ARU researchers and students were allowed access to municipal wastewater treatment plants in the towns of Phuthaditjhaba and Harrismith, and ethical clearance from the UFS permitted limited environmental sampling and laboratory testing using live organisms such as snails and earthworms.

Focusing on the quality of natural water bodies
In November 2016, Ms Portia Mosolloane (2016 honours student) presented the preliminary findings of the project at an ARU colloquium held in the Golden Gate Highlands National Park. Her work has drawn attention to potential localised incidents of terrestrial contamination linked to sewage sludge management in the region. Those early findings were published internationally, and in May 2018, Ms Mosolloane went on to present her research at the 28th Annual Meeting of the Society of Environmental Toxicology and Chemistry (SETAC) in Rome, Italy.

In an attempt to mitigate sewage sludge-induced soil pollution, Ms Nomasonto Dlamini (master’s student) conducted research from 2018 on the potential beneficial effects of biochar amendment on the sewage sludge as an alternative management strategy. The results revealed that mixing biochar with sewage sludge prior to open-air storage would significantly decrease the toxic effects on terrestrial organisms such as oligochaetes. This work is still ongoing, although in May 2019, Ms Dlamini presented some of her findings at the Fifth World Congress on Risk Development and Resilience in Cape Town.

From the start, an important focus of our research has been the quality of natural water bodies in our region and its ability to support life. In 2020, Ms Mosolloane graduated cum laude with a Master of Science, having successfully established that, particularly along polluted and degraded sections of our rivers, the diversity of riparian invertebrate was heavily skewed and reduced. Her work on water quality has suggested that our failing wastewater treatment plants (due to ageing, capacity overload, and poor management) are contributing to the release of pathogenic bacteria such as Escherichia coli in the local rivers.

Mr Mbuyiselwa Moloi (a 2020 Master of Science graduate from the project) found through his research that wastewater treatment plants only contribute partially to river pollution in the region. His work, focusing on metal pollution in the Elands River (Phuthaditjhaba) and the Wilge River (Harrismith), established that although there is evidence of metal enrichment after wastewater processing by the treatment plants, some of the metal in the rivers emanates from the communities that, due to the lack of adequate refuse removal services, often dispose of their household waste directly into the rivers. Mr Moloi’s research was presented at the 2019 International Mountain Conference in Innsbruck, Austria, and was subsequently published in the International Journal of Hygiene and Environmental Health in 2020.

Ms Matseleng Semase (a 2020 Master of Science graduate from the project) worked on establishing whether the quality of the effluent released from the local wastewater treatment plants was conducive to supporting aquatic life. Using a snail species in the laboratory, she found that although of substandard quality, the effluent released from the treatment plants did not hamper growth and reproduction in her test organism. This pointed to the fact that corrective measures could still be taken to reduce the harmful impact of wastewater management processes on river health in the eastern Free State. Ms Semase’s work was presented at the 9th SETAC Africa Biennial Conference held in Cape Town in 2019, and her findings were submitted for publication in Environmental Science and Pollution Research.

First such project focusing exclusively on pollution issues
Some of our findings infused new life into the project, steering our work in unexpected directions. Early in the project we came to realise that there was a paucity of research focusing on pollution in mountain areas in South Africa and in Africa at large. Mr Hendrik Stander joined the project in 2019 as a master’s student. His task was to work on the development of fast and reliable behavioural testing protocols that could be used in the project. His preliminary findings were presented at the 40th annual meeting of SETAC North America in Toronto, Canada, and were subsequently published in the Bulletin of Environmental Contamination and Toxicology. Ms Sanele Mnkandla, who joined the project as a PhD candidate in 2020, is working on proposing water remediation strategies that could help improve the state of the rivers in the region. She recently submitted a review article on the topic for publication in Environmental Evidence. Another review article in the making and focusing on literature evidence of mountain pollution in Africa, is the brainchild of Dr Ozekeke Ogbeide, a collaborator from the University of Benin (Nigeria), who co-supervised several students and co-authored some of the scientific publications from the project.

This ongoing research, under the auspices of the ARU, is the first such project focusing exclusively on pollution issues in a select Afromontane region. With Ms Dlamini, Mr Stander, and Ms Mnkandla still actively involved in the project, we look forward to finding more answers to the environmental challenges of the eastern Free State and to working together with MAP towards environmental sustainability in the region.

News Archive

Inaugural lecture: Prof. Phillipe Burger
2007-11-26

 

Attending the lecture were, from the left: Prof. Tienie Crous (Dean of the Faculty of Economic and Management Sciences at the UFS), Prof. Phillipe Burger (Departmental Chairperson of the Department of Economics at the UFS), and Prof. Frederick Fourie (Rector and Vice-Chancellor of the UFS).
Photo: Stephen Collet

 
A summary of an inaugural lecture presented by Prof. Phillipe Burger on the topic: “The ups and downs of the South African Economy: Rough seas or smooth sailing?”

South African business cycle shows reduction in volatility

Better monetary policy and improvements in the financial sector that place less liquidity constraints on individuals is one of the main reasons for the reduction in the volatility of the South African economy. The improvement in access to the financial sector also enables individuals to manage their debt better.

These are some of the findings in an analysis on the volatility of the South African business cycle done by Prof. Philippe Burger, Departmental Chairperson of the University of the Free State’s (UFS) Department of Economics.

Prof. Burger delivered his inaugural lecture last night (22 November 2007) on the Main Campus in Bloemfontein on the topic “The ups and downs of the South African Economy: Rough seas or smooth sailing?”

In his lecture, Prof. Burger emphasised a few key aspects of the South African business cycle and indicated how it changed during the periods 1960-1976, 1976-1994 en 1994-2006.

With the Gross Domestic Product (GDP) as an indicator of the business cycle, the analysis identified the variables that showed the highest correlation with the GDP. During the periods 1976-1994 and 1994-2006, these included durable consumption, manufacturing investment, private sector investment, as well as investment in machinery and non-residential buildings. Other variables that also show a high correlation with the GDP are imports, non-durable consumption, investment in the financial services sector, investment by general government, as well as investment in residential buildings.

Prof. Burger’s analysis also shows that changes in durable consumption, investment in the manufacturing sector, investment in the private sector, as well as investment in non-residential buildings preceded changes in the GDP. If changes in a variable such as durable consumption precede changes in the GDP, it is an indication that durable consumption is one of the drivers of the business cycle. The up or down swing of durable consumption may, in other words, just as well contribute to an up or down swing in the business cycle.

A surprising finding of the analysis is the particularly strong role durable consumption has played in the business cycle since 1994. This finding is especially surprising due to the fact that durable consumption only constitutes about 12% of the total household consumption.

A further surprising finding is the particularly small role exports have been playing since 1960 as a driver of the business cycle. In South Africa it is still generally accepted that exports are one of the most important drivers of the business cycle. It is generally accepted that, should the business cycles of South Africa’s most important trade partners show an upward phase; these partners will purchase more from South Africa. This increase in exports will contribute to the South African economy moving upward. Prof. Burger’s analyses shows, however, that exports have generally never fulfil this role.

Over and above the identification of the drivers of the South African business cycle, Prof. Burger’s analysis also investigated the volatility of the business cycle.

When the periods 1976-1994 and 1994-2006 are compared, the analysis shows that the volatility of the business cycle has reduced since 1994 with more than half. The reduction in volatility can be traced to the reduction in the volatility of household consumption (especially durables and services), as well as a reduction in the volatility of investment in machinery, non-residential buildings and transport equipment. The last three coincide with the general reduction in the volatility of investment in the manufacturing sector. Investment in sectors such as electricity and transport (not to be confused with investment in transport equipment by various sectors) which are strongly dominated by the government, did not contribute to the decrease in volatility.

In his analysis, Prof. Burger supplies reasons for the reduction in volatility. One of the explanations is the reduction in the shocks affecting the economy – especially in the South African context. Another explanation is the application of an improved monetary policy by the South African Reserve Bank since the mid 1990’s. A third explanation is the better access to liquidity and credit since the mid 1990’s, which enables the better management of household finance and the absorption of financial shocks.

A further reason which contributed to the reduction in volatility in countries such as the United States of America’s business cycle is better inventory management. While the volatility of inventory in South Africa has also reduced there is, according to Prof. Burger, little proof that better inventory management contributed to the reduction in volatility of the GDP.

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