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28 August 2024 | Story André Damons | Photo Supplied
Prof Patricks Voua Otomo
Prof Patricks Voua Otomo, Associate Professor and subject head of Department of Zoology and Entomology at the University of the Free State (UFS).

In an effort to alleviate the burden of water contamination, Prof Patricks Voua Otomo, Associate Professor in the Department of Zoology and Entomology at the University of the Free (UFS) is researching how mushrooms can be used to significantly reduce the toxicity of water.

The degradation of river systems in South Africa has been linked primarily to the inability of municipalities to properly treat wastewater. According to the 2022 Green Drop Report, out of the existing 850 wastewater systems across 90 municipalities, only 23 (or less than 3%) qualified for the Green Drop Certification. This underscores the depth and breadth of the wastewater treatment crisis in South Africa and its potential implications for human and environmental health.

In 2030, billions of people will still lack access to safe water, sanitation and hygiene services – the most basic human need for health and well-being. Target 6.1 of the United Nations (UN) Sustainable Development Goals (SDGs) – SDG 6 – aims to achieve universal and equitable access to safe and affordable drinking water for all, while target 6.3 is also looking to improve water quality by reducing pollution, eliminating dumping and minimising release of hazardous chemicals and materials, halving the proportion of untreated wastewater and substantially increasing recycling and safe re-use globally by 2030.

These challenges inform Prof Voua Otomo’s research, which focuses on the drivers of river pollution in the Qwaqwa region, ways to mitigate/remediate their effects, and the development of simple and quick methods to assess water quality. His research, which is part of the UFS 2023 Impact Report, has drawn attention to localised incidences of terrestrial and aquatic contamination linked to sewage sludge management by local wastewater treatment plants.

Using mycofiltration to reclaim the quality of contaminated water

In Qwaqwa, wastewater treatment plants, however, are not the only source of river pollution, as a significant amount of river pollutants emanates directly from the communities that often dispose of their household waste directly into the waterways. This has led to unacceptable levels of pharmaceuticals such as biphenyl-4-ylacetic acid (an anti-inflammatory), efavirenz (an HIV medicine), and carbamazepine (an epilepsy medicine) ending up in rivers.

To attempt to reclaim the quality of contaminated water, ongoing research in Prof Voua Otomo’s laboratory involves the use of ‘mycofiltration’, i.e., the use of fungal mycelia for the purpose of water filtration. This relatively untapped eco-friendly technology is attracting more attention, yet its real merits are only now being established and documented scientifically.

“Various species of fungi have been explored in bioremediation studies, and those belonging to the Pleurotus genus (edible mushrooms) have demonstrated an exceptional ability in the biosorption of contaminants,” says Prof Voua Otomo.

In his field of research, Prof Voua Otomo says snails can be used as bioindicators (i.e., organisms used to assess the health of an environment or ecosystem, particularly by indicating the presence and impact of pollutants or other environmental stressors) or biomonitors (i.e., organisms or a biological systems used to assess the health of an environment, particularly by detecting changes in the levels of pollutants or other harmful substances).

“We designed a mycofilter made of mycelia from the mushroom species Pleurotus ostreatus and filtrated water contaminated with the organic insecticide imidacloprid and the inorganic chemical iron (III). The results showed that mycofiltration could remove up to 94% of iron (III) and 31% of imidacloprid.

“Mycofiltration works through a process called adsorption, which is the process where molecules, ions, or particles from a gas, liquid, or dissolved solid, stick to a surface. This happens when the adsorbate (the substance being adsorbed) attaches to the adsorbent (the surface it adheres to),” Prof Voua Otomo explains.

Mycofiltration viable and affordable for water remediation

This research is the brainchild of Sanele Mnkandla, a final-year PhD student in Prof Voua Otomo’s laboratory. “A few years ago, she suggested looking at mycofiltration as a means to improve the quality of contaminated water. Freshwater snails were the most suitable organisms to help assess the improvement of the water quality after mycofiltration,” explains Prof Voua Otomo.

According to him, they are currently exploring ways to upscale the mycofilter to improve the quality of larger bodies of water, including rivers. The duration of the process depends on the size of the filter, the amount of water to be filtered and the targeted chemicals. Bigger filters, explains Prof Voua Otomo, will filter larger amounts of water over a relatively longer time whereas smaller ones will be saturated quickly. The process could last from minutes to days.

“We have published a technical note on the topic and a proof of concept. We are currently testing this technology using wastewater effluent in the Qwaqwa region. We are also exploring local applications in rainwater harvesting.

“Mycofiltration is certainly a viable and affordable option for water remediation, which can find a wide range of applications in South Africa,” he says. 

Watch the video below

News Archive

Sarah, our own champion
2008-11-05

 
Sarah Shannon at the Paralympic Games in Beijing

 

Sarah Shannon, a second-year student in the Postgraduate Certificate in Education, has been involved in disability sport on national level for the past 12 years. Sarah has cerebral palsy.

In 1996 she participated at the South African National Championships for the physically disabled for the first time, entering for several sporting codes and winning five gold medals. In swimming she participates in the S3 class together with other swimmers that have comparable abilities to hers.

In 1997 she decided to focus on swimming competitively. She participated in her first national championships for swimming that year. After that (1998) she represented South Africa on international level at the International Paralympic Committee’s (IPC) Swimming World Championships in New Zealand where she ended 4th in the 50m backstroke and 7th in both the 50m and 100m freestyle in her class.

In 1999 she represented South Africa in Johannesburg at the 7th All Africa Games and won a silver medal for the 50m freestyle and a bronze medal for the 100m freestyle.

In 2000 she was part of the South African team at the Sydney Paralympic Games where she reached the finals and finished 7th in the 50m backstroke and 8th in the 50m freestyle. Northern-KwaZulu-Natal also awarded her the Junior Sportswoman of the Year award in 2001. In 2002 she participated at the South African Senior National swimming championships for KwaZulu-Natal in the multi-disability category.

In 2005 she completed the Midmar Mile. She also represented South Africa at the world championships for athletes with cerebral palsy in Boston in the United States of America. She won two gold medals for respectively the 50m freestyle and the 50m backstroke and two silver medals in the 100m and 200m freestyle. She was also nominated to represent South Africa as athlete’s representative on the world committee of CPISRA (Cerebral Palsy International Sports and Recreation Association). In this year Sarah also received the KwaZulu-Natal Premier’s Sportswoman with a disability award of the year.

In 2006 she qualified for the IPC world championships but could not attend.

In 2007 she represented South Africa once more at the Visa Paralympic World Cup in Manchester in the United Kingdom where she broke the South African record in the 50m backstroke, finishing 7th in the 50m freestyle and 6th in the 50m backstroke.

She was also part of the very successful Team South Africa to the Paralympic Games in Beijing. She reached the finals in both the 50m backstroke and 50m freestyle. She finished 7th in the 50m freestyle and 6th in the 50m backstroke in personal best times for both events. She has been participating in the able bodied South African National Swimming Championships since 2002. She is currently ranked 2nd in the world for short course items and 11th for the long course items. She is truly our best swimmer in the S3 class.
 

 

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