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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

UFS staff get salary increase of at least 7,25%
2007-11-20

 

During the signing of the UFS's salary agreement were, from the left: Mr Olehile Moeng (Chairperson of NEHAWU), Prof. Frederick Fourie (Rector and Vice-Chancellor of the UFS), and Prof. Johan Grobbelaar (Chairperson of UVPERSU and spokesperson of the Joint Union Forum).
 

UFS staff get salary increase of at least 7,25%

The University of the Free State’s (UFS) management and trade unions have agreed on an increase of 9,32% in the service benefits of staff for 2008. This includes a general minimum salary increase of 7,25%.

A once-off non-pensionable bonus of R3 000 will be paid in December 2007.

The agreement was signed today by representatives of the UFS management and the trade unions, UVPERSU and NEHAWU.

“As the state subsidy level is unfortunately not yet known, remuneration could vary several percentage points between a window of 7,25 and 8,39%,” said Prof. Frederick Fourie, Rector and Vice-Chancellor of the UFS.

Should the government subsidy be such that the increase falls outside the window of 8,39%, the parties will negotiate again.

The bonus will be paid to staff members who were employed by the UFS on UFS conditions of service on 14 November 2007 and who assumed duties before 1 October 2007.

The bonus is payable in December 2007 in recognition of the role played by staff during the year to promote the UFS as a university of excellence and as confirmation of the role and effectiveness of the remuneration model.

“It is important to note that this bonus can be paid due to the favourable financial outcome of 2007,” said Prof. Fourie.

“Our intention is to pass the maximum benefit possible on to staff without exceeding the limits of financial sustainability of the institution.  For this reason, the negotiating parties reaffirmed their commitment to the Multiple-year Income-related Remuneration Improvement Model used as a framework for negotiations.  The model and its applications are unique and has as a point of departure that the UFS must be and remain financially sustainable,” said Prof. Fourie and Prof. Johan Grobbelaar, Chairperson of UVPERSU and Spokesperson of the Joint Union Forum.

The agreement provides for the phasing in of fringe benefits of contract appointments for 2008.  This includes the implementation of a pension/provident fund, housing allowance and the medical fund allowance as from 1 January 2008 to staff who are appointed on a contract basis.

Agreement was also reached that 1,0% will be allocated for structural adjustments in order to partially address the backlog in respect of remuneration packages of other higher education institutions.  These adjustments will be made after further investigations during 2008. 

The post levels that have been earmarked for adjustment are academic staff (associate professor, professor and dean) as well as certain post levels in the support services.

An additional R500 000 will be allocated to accelerate the rate of phasing in the medical fund allowances. 

The implementation date for the salary adjustments is 1 January 2008, but could possibly be implemented only at a later stage due to logistical reasons.   The adjustment will be calculated on the remuneration package.

The agreement also applies to all staff members of the Vista and Qwaqwa Campuses whose conditions of employment have already been aligned with those of the Main Campus.

Prof. Grobbelaar said that salary negotiations were never easy, but the model is an important tool.  He said the Joint Union Forum illustrates that people from different groups can work together if they share the same commitment and goal.

In 2007, a total salary adjustment of 5,7% and a once-off non-pensionable bonus of R2 000 was paid to staff.

Media Release
Issued by: Lacea Loader
Assistant Director: Media Liaison  
Tel:  051 401 2584
Cell:  083 645 2454
E-mail:  loaderl.stg@ufs.ac.za
20 November 2007

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