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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

Media: Sunday Times
2006-05-20

Sunday Times, 4 June 2006

True leadership may mean admitting disunity
 

In this edited extract from the inaugural King Moshoeshoe Memorial Lecture at the University of the Free State, Professor Njabulo S Ndebele explores the leadership challenges facing South Africa

RECENT events have created a sense that we are undergoing a serious crisis of leadership in our new democracy. An increasing number of highly intelligent, sensitive and committed South Africans, across class, racial and cultural spectrums, confess to feeling uncertain and vulnerable as never before since 1994.

When indomitable optimists confess to having a sense of things unhinging, the misery of anxiety spreads. We have the sense that events are spiralling out of control and that no one among the leadership of the country seems to have a definitive handle on things.

There can be nothing more debilitating than a generalised and undefined sense of anxiety in the body politic. It breeds conspiracies and fear.

There is an impression that a very complex society has developed, in the last few years, a rather simple, centralised governance mechanism in the hope that delivery can be better and more quickly driven. The complexity of governance then gets located within a single structure of authority rather than in the devolved structures envisaged in the Constitution, which should interact with one another continuously, and in response to their specific settings, to achieve defined goals. Collapse in a single structure of authority, because there is no robust backup, can be catastrophic.

The autonomy of devolved structures presents itself as an impediment only when visionary cohesion collapses. Where such cohesion is strong, the impediment is only illusory, particularly when it encourages healthy competition, for example, among the provinces, or where a province develops a character that is not necessarily autonomous politically but rather distinctive and a special source of regional pride. Such competition brings vibrancy to the country. It does not necessarily challenge the centre.

Devolved autonomy is vital in the interests of sustainable governance. The failure of various structures to actualise their constitutionally defined roles should not be attributed to the failure of the prescribed governance mechanism. It is too early to say that what we have has not worked. The only viable corrective will be in our ability to be robust in identifying the problems and dealing with them concertedly.

We have never had social cohesion in South Africa — certainly not since the Natives’ Land Act of 1913. What we definitely have had over the decades is a mobilising vision. Could it be that the mobilising vision, mistaken for social cohesion, is cracking under the weight of the reality and extent of social reconstruction, and that the legitimate framework for debating these problems is collapsing? If that is so, are we witnessing a cumulative failure of leadership?

I am making a descriptive rather than an evaluative inquiry. I do not believe that there is any single entity to be blamed. It is simply that we may be a country in search of another line of approach. What will it be?

I would like to suggest two avenues of approach — an inclusive model and a counter-intuitive model of leadership.

In an inclusive approach, leadership is exercised not only by those who have been put in some position of power to steer an organisation or institution. Leadership is what all of us do when we express, sincerely, our deepest feelings and thoughts; when we do our work, whatever it is, with passion and integrity.

Counter-intuitive leadership lies in the ability of leaders to read a problematic situation, assess probable outcomes and then recognise that those outcomes will only compound the problem. Genuine leadership, in this sense, requires going against probability in seeking unexpected outcomes. That’s what happened when we avoided a civil war and ended up with an “unexpected” democracy.

Right now, we may very well hear desperate calls for unity, when the counter-intuitive imperative would be to acknowledge disunity. A declaration of unity where it manifestly does not appear to exist will fail to reassure.

Many within the “broad alliance” might have the view that the mobilising vision of old may have transformed into a strategy of executive steering with a disposition towards an expectation of compliance. No matter how compelling the reasons for that tendency, it may be seen as part of a cumulative process in which popular notions of democratic governance are apparently undermined and devalued; and where public uncertainty in the midst of seeming crisis induces fear which could freeze public thinking at a time when more voices ought to be heard.

Could it be that part of the problem is that we are unable to deal with the notion of opposition? We are horrified that any of us could be seen to have become “the opposition”. The word has been demonised. In reality, it is time we began to anticipate the arrival of a moment when there is no longer a single, overwhelmingly dominant political force as is currently the case. Such is the course of history. The measure of the maturity of the current political environment will be in how it can create conditions that anticipate that moment rather than seek to prevent it. We see here once more the essential creativity of the counter-intuitive imperative.

This is the formidable challenge of a popular post-apartheid political movement. Can it conceptually anticipate a future when it is no longer overwhelmingly in control, in the form in which it is currently, and resist, counter-intuitively, the temptation to prevent such an eventuality? Successfully resisting such an option would enable its current vision and its ultimate legacy to our country to manifest in different articulations, which then contend for social influence. In this way, the vision never really dies; it simply evolves into higher, more complex forms of itself. Consider the metaphor of flying ants replicating the ant community by establishing new ones.

We may certainly experience the meaning of comradeship differently, where we will now have “comrades on the other side”.

Any political movement that imagines itself as a perpetual entity should look at the compelling evidence of history. Few movements have survived those defining moments when they should have been more elastic, and that because they were not, did not live to see the next day.

I believe we may have reached a moment not fundamentally different from the sobering, yet uplifting and vision-making, nation-building realities that led to Kempton Park in the early ’90s. The difference between then and now is that the black majority is not facing white compatriots across the negotiating table. Rather, it is facing itself: perhaps really for the first time since 1994. Could we apply to ourselves the same degree of inventiveness and rigorous negotiation we displayed leading up to the adoption or our Constitution?

This is not a time for repeating old platitudes. It is the time, once more, for vision.

In the total scheme of things, the outcome could be as disastrous as it could be formative and uplifting, setting in place the conditions for a true renaissance that could be sustained for generations to come.

Ndebele is Vice-Chancellor of the University of Cape Town and author of the novel The Cry of Winnie Mandela

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