NRF Youth Month Spotlight Highlights Innovative Doctoral Work

South Africa’s National Research Foundation (NRF) has drawn attention to emerging doctoral research that repurposes agricultural waste into a tool for addressing one of the country’s most persistent environmental challenges. The work centres on activated carbon derived from potato peels and its potential application in treating acid mine drainage (AMD), a legacy issue tied to the nation’s extensive mining history.

AMD arises when sulphide minerals in exposed rock react with water and oxygen, producing acidic water laden with heavy metals. In regions such as Gauteng and the Witwatersrand Basin, this phenomenon has long affected water quality, ecosystems and communities. Government bodies including the Department of Water and Sanitation and research entities have supported multiple remediation strategies over the years.

From Kitchen Waste to Water Treatment Material

The doctoral project examines how potato peels, an abundant agricultural byproduct, can be processed into activated carbon capable of adsorbing contaminants from AMD. Preparation involves carbonisation followed by chemical or physical activation to increase surface area and porosity. Modification steps may enhance selectivity for specific metals such as iron, manganese or sulphate ions.

Early laboratory results suggest the material performs competitively with conventional activated carbons while offering a lower-cost, locally sourced alternative. The approach aligns with circular-economy principles by converting waste into a functional resource.

Broader Landscape of AMD Research in South Africa

Academic and applied research on AMD treatment has expanded significantly since the late 1990s. Reviews published in peer-reviewed journals document a shift from purely chemical neutralisation toward passive biological systems, membrane technologies and adsorbent materials. The NRF has played a consistent role in funding postgraduate studies that explore these avenues.

Institutions across the country contribute to this body of work. Universities with strong environmental engineering and chemistry programmes regularly partner with industry and statutory bodies such as the Water Research Commission and Mintek.

Implications for Higher Education and Skills Development

Projects of this nature illustrate how NRF funding supports advanced training while addressing national priorities. Doctoral candidates gain expertise in materials science, water chemistry and sustainable process design—competencies increasingly sought by both academia and the mining sector.

Such research also creates opportunities for interdisciplinary collaboration. Chemistry departments work alongside environmental science and engineering faculties, often incorporating field sampling from affected mine sites. The resulting publications and theses contribute to South Africa’s growing repository of locally generated knowledge on water remediation.

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Potential Industry and Community Benefits

If scaled, potato-peel-derived carbon could reduce reliance on imported treatment chemicals and lower operational costs for mines and water authorities. Passive or semi-passive systems using such adsorbents may prove suitable for remote or post-closure sites where energy-intensive treatment is impractical.

Communities downstream of mining operations stand to benefit from improved water quality. Reduced metal loads can support agriculture, fisheries and domestic use, contributing to broader socio-economic resilience in affected regions.

Challenges and Next Steps in Translation

Translating laboratory success to field application requires addressing variables such as fluctuating AMD chemistry, competition from other ions and long-term adsorbent regeneration. Pilot-scale trials at representative sites will be essential to validate performance under real conditions.

Regulatory pathways for new treatment materials also warrant attention. Engagement with the Department of Mineral Resources and Energy and environmental authorities can help streamline approval processes while maintaining rigorous safety standards.

Role of the NRF in Fostering Applied Research

The NRF’s support for early-career researchers through programmes highlighted during Youth Month underscores a commitment to building research capacity. By spotlighting work that links agricultural waste streams with mining remediation, the foundation encourages solutions that are both innovative and contextually appropriate for South African conditions.

Funding mechanisms often prioritise projects with clear societal impact, aligning doctoral training with national development goals in water security and environmental sustainability.

Future Outlook for Sustainable Remediation Technologies

Continued investment in bio-based adsorbents and similar green technologies could diversify South Africa’s toolkit for AMD management. Integration with existing passive treatment wetlands or bioreactors may yield hybrid systems that optimise cost and efficiency.

Academic programmes are likely to expand modules on circular-economy approaches and life-cycle assessment, preparing the next generation of researchers and practitioners for these evolving challenges.

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Stakeholder Perspectives

University supervisors involved in similar projects emphasise the value of applied research that connects laboratory work with industry needs. Mining companies have expressed interest in cost-effective, locally produced treatment options that also support environmental, social and governance reporting requirements.

Regulatory bodies continue to monitor progress while encouraging evidence-based innovation that meets water-quality standards set by the Department of Water and Sanitation.

Conclusion and Call for Continued Support

The NRF-supported doctoral research on potato-peel carbon represents a promising intersection of waste valorisation and water remediation. As South Africa navigates the dual imperatives of economic activity in mining and environmental protection, such studies contribute practical knowledge and skilled graduates to the national effort.

Further details on the project and related NRF initiatives are available on the foundation’s website.

Learn more about Sentse Oyandi’s research at the NRF.

Additional context on AMD research trends appears in recent reviews, including work published in Water (2025) and earlier studies in the South African Journal of Science.