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01 April 2019 | Story Leonie Bolleurs | Photo Sonia Small
Summer School
Perspectives on aquatic biomonitoring from Germany and Southern Africa were discussed at the recent German-Southern African Summer School 2019.

Water is a basic resource upon which communities rely for their health, well-being, and economic development and growth. Many countries struggle with the negative consequences of poor surface-water quality, which may threaten their food security and livelihoods.

The Centre for Environmental Management at the University of the Free State recently co-presented the German-Southern African Summer School 2019 with the Dresden University, Germany, on its Bloemfontein Campus. 

Discussions at the Summer School – attended by 66 delegates from Germany and Southern Africa – mainly focused on aquatic biomonitoring and included perspectives from Germany and Southern Africa. 

Questions such as ‘How to improve water quality?’ and ‘What about the impact of the catchment area, land use, and agriculture on water quality?’ were discussed. 

According to Marinda Avenant, Lecturer in the Centre for Environmental Management, a two-pronged approach is often used: first, ecosystem-based biomonitoring, and second, specialised water quality and toxicity-assessment methods applied at specific sites in order to identify problems.

Presenters from academia, government authorities, and the private sector shared theoretical concepts and practical experiences of establishing aquatic biomonitoring networks in Germany, South Africa, Namibia, Lesotho, Eswatini (Swaziland), and Zambia. 

The Summer School focused on an integrated approach, including catchment processes, hydrology, geomorphology, and land use, as well as chemical and biological monitoring. 

Delegates also undertook a field trip to Mokala National Park for a practical demonstration of water-quality monitoring as part of the programme. 

The Volkswagen Foundation (Germany) funded the Summer School.


News Archive

UFS venture cleans up acid mine drainage
2015-07-06

The system that puts oxygen back into the water.

Photo: Supplied

South Africa is one of the most important mining countries in the world, beginning in the 1870s. Although the mining industry has been responsible for significant development and employment, it pollutes the environment and waters sources. Through the joint effort of a well-known mining company, the University of the Free State, and the Technology Innovation Agency (UFS/TIA) SAENSE Group, a new treatment for Acid Mine Drainage (AMD) has been developed.

The system treats the major contaminants found in acid mining wastewater effectively.  
 
The UFS remediation systems use a reservoir tank into which the AMD is pumped. The water then flows passively (without using energy) to the Barium Carbonate Dispersed Alkaline Substrate (BDAS) system. The metals and anions in the AMD react chemically with the barium carbonate and precipitate (form solids). The solids stay in the tank while the clean water is released.

The efficacy and applicability of the research was demonstrated on site in Belfast, Mpumalanga where the team constructed a pilot plant in July 2014. This patented technology has treated 1 814 400 litres of Acid Mine Drainage to date with an outflow water quality that satisfies the South African National Standards (SANS) 241:2006 & 2011 regulations for drinking water.   

Rohan Posthumus from the (UFS/TIA) SAENSE Group said: “At this stage, we do not recommend that the water should be used as drinking water, but certainly it can lower water usage in mines while finding application in dust suppression of washing processes. The team would like to complete a full characterisation of the final released water. There are currently no toxic by-products formed, and even very basic filtration can make the outflow drinking water.”

Prof Esta van Heerden’s research group from the Department of Microbial, Biochemical, and Food Biotechnology has been working on AMD research for some time, but the development of the BDAS system was started in 2013 by post-doctoral student, Dr Julio Castillo, and his junior researcher, Rohan Posthumus.

The data from the BDAS system have led to two publications in peer-reviewed journals as well as a registered patent.

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