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UFS researchers reimagine ancient stromatolites to advance Ecological Engineering Sciences

12 June 2025 | Story University of the Free State | Photo Supplied

Dr Hossein Naghizadeh and Refilwe Lediga — Collaborative innovation in action: Researchers from the University of the Free State’s Green Concrete Lab have partnered with the University of Johannesburg to advance 3D printing technologies using sustainable concrete materials. Pictured (from left): Dr Hossein Naghizadeh, Senior Lecturer in Engineering Sciences at UFS, and Refilwe Lediga, Concrete Printing Research Expert in the Department of Civil Engineering Technology at UJ.

In an ambitious and interdisciplinary effort to address today’s Grand Challenges, researchers at the University of the Free State (UFS) are exploring how nature’s oldest life forms – stromatolites – can inspire cutting-edge innovations in industrial ecology and marine conservation. Drawing from biomimicry, 3D printing, and microbial engineering, their work showcases the convergence of ecological insight with modern technology.

“One such example is replicating the structures of stromatolites – some of the earliest evidence of life - using green cement and 3D printing, the latest technology in industrial ecology,” explains Dr Jacques Maritz, Head of the Unit of Engineering Sciences at UFS.

Ancient structures, modern science

Stromatolites are layered microbial formations created by ancient cyanobacteria and date back over 3.5 billion years. These living fossils, found in fossil records and rare modern environments like Shark Bay in Australia, grow through a combination of photosynthesis, sediment trapping, and calcium carbonate precipitation. Not only do they support biodiversity, but they also play a vital role in natural carbon sequestration.

UFS researchers are harnessing the lessons from these ancient formations to address urgent environmental challenges. In particular, Dr Yolandi Schoeman, Senior Lecturer at the Centre for Biogeochemistry, is leading efforts to cultivate hybrid stromatolites in controlled environments, using microbial consortia grown on 3D-printed scaffolds.

“At UFS, we are reimagining stromatolite formation through both artificial structural replication and biological cultivation, bridging industrial ecology and microbial engineering to address modern environmental challenges,” says Dr Schoeman.

Ecological engineering for reef restoration

The rapid decline of marine biodiversity and the degradation of natural reef ecosystems have prompted ecological engineers to develop innovative solutions. At the UFS Green Concrete Lab, researchers are pioneering the design of artificial reefs using 3D-printed, low-carbon geopolymer concrete – a material formulated from industrial by-products such as fly ash and slag.

Artificial reefs mimic natural reef complexity and serve as critical habitats for marine life, from fish and crustaceans to coral polyps and algae. Algae, in particular, are key to marine ecosystems due to their roles in nutrient cycling, oxygen production, and carbon capture.

“Green concrete refers to concrete that utilises alternative binders and industrial by-products, significantly reducing the environmental footprint. At UFS, we are focusing on geopolymer concrete, which eliminates the high-energy processes associated with Portland cement, while offering greater chemical resistance - ideal for marine applications,” explains Dr Abdolhossein Naghizadeh from the Unit of Engineering Sciences.

3D printing nature’s complexity

One of the challenges in artificial reef development is replicating biologically inspired geometries that support diverse marine ecosystems. Traditional construction methods often fail in this regard, but additive manufacturing, or 3D concrete printing, is providing a solution.

The UFS Green Concrete Lab, in collaboration with the University of Johannesburg, is developing reef modules with intricate geometries and natural surface textures. These features support coral and algae attachment, accelerate ecological colonisation, and enhance habitat functionality. Biochar-based compost filters are also being integrated to aid algae-driven wastewater treatment.

A particularly novel avenue of research involves using 3D printing to recreate stromatolite structures. These serve as ancient blueprints for modern reef design, merging deep-time ecological understanding with advanced material science.

Biologically engineered hybrid stromatolites

In parallel to structural efforts, UFS is advancing biological approaches to stromatolite cultivation. From July 2025, researchers in the Unit of Engineering Sciences will initiate a large-scale experiment using microbial consortia in 60-litre tanks, scaling up to 1 m² hypersaline ponds. 3D-printed conical scaffolds, coated with materials such as PP-CaCO₃, hydroxyapatite, and silica gel, will accelerate microbial colonisation and lamination.

The goal: to achieve stromatolite growth of 14-16 mm in just 28 days - over 150 times faster than in nature. These hybrid systems are expected to produce 7-8 mg/L/day of oxygen, sequester carbon at 3.2 g/m²/day, and remove up to 90% of nitrates and phosphates from water. The potential applications extend from terrestrial ecosystem restoration to extraterrestrial life-support systems.

A multidisciplinary vision for sustainability

This work exemplifies the strength of interdisciplinary research at UFS, combining civil engineering, mechatronics, marine ecology, chemistry, microbiology, and digital fabrication. The Ecological Engineering Sciences stream fosters a vibrant environment for postgraduate students to develop practical, impactful solutions.

The Green Concrete Lab is central to these efforts, offering students and researchers access to advanced technologies and collaborative networks. Through their innovative work in 3D-printed green concrete and microbial systems, UFS researchers are addressing biodiversity loss, advancing sustainable construction, and contributing to the global climate agenda.

“Whether it's rethinking materials, restoring ecosystems, or redefining what concrete can be, our research is laying the foundation for a better, more sustainable world beneath the waves,” concludes Dr Maritz.

News Archive

MBA Programme - Question And Answer Sheet - 27 May 2004

2004-05-27

1. WHAT MUST THE UNIVERSITY OF THE FREE STATE (UFS) DO TO GET FULL ACCREDITATION FOR THE MBA PROGRAMMES?

According to the Council on Higher Education’s (CHE) evaluation, the three MBA programmes of the UFS clearly and significantly contribute to students’ knowledge and skills, are relevant for the workplace, are appropriately resourced and have an appropriate internal and external programme environment. These programmes are the MBA General, the MBA in Health Care Management and the MBA in Entrepreneurship.

What the Council on Higher Education did find, was a few technical and administrative issues that need to be addressed.

This is why the three MBA programmes of the UFS received conditional accreditation – which in itself is a major achievement for the UFS’s School of Management, which was only four years old at the time of the evaluation.

The following breakdown gives one a sense of the mostly administrative nature of the conditions that have to be met before full accreditation is granted by the CHE:

a. A formal forum of stakeholders: The UFS is required to establish a more structured, inclusive process of review of its MBA programmes. This is an administrative formality already in process.

b. A work allocation model: According to the CHE this is required to regulate the workload of the teaching staff, particularly as student numbers grow, rather than via standard management processes as currently done.

c. Contractual agreements with part-time staff: The UFS is required to enter into formal agreements with part-time and contractual staff as all agreements are currently done on an informal and claim-basis. This is an administrative formality already in process.

d. A formal curriculum committee: According to the CHE, the School of Management had realised the need for a structure – other than the current Faculty Board - where all MBA lecturers can deliberate on the MBA programmes, and serve as a channel for faculty input, consultation and decision-making.

e. A system of external moderators: This need was already identified by the UFS and the system is to be implemented as early as July 2004.

f. A compulsory research component: The UFS is required to introduce a research component which will include the development of research skills for the business environment. The UFS management identified this need and has approved such a component - it is to take effect from January 2005. This is an insufficient element lacking in virtually all MBA programmes in South Africa.

g. Support programmes for learners having problems with numeracy: The UFS identified this as a need for academic support among some learners and has already developed such a programme which will be implemented from January 2005.

The majority of these conditions have been satisfied already and few remaining steps will take effect soon. It is for this reason that the UFS is confident that its three MBA programmes will soon receive full accreditation.

2. WHAT ACCREDITATION DOES THE UFS HAVE FOR ITS MBA PROGRAMME?

The UFS’s School of Management received conditional accreditation for its three MBA programmes.

Two levels of accreditation are awarded to tertiary institutions for their MBA programmes, namely full accreditation and conditional accreditation. When a programme does not comply with the minimum requirements regarding a small number of criteria, conditional accreditation is given. This can be rectified during the short or medium term.

3. IS THERE ANYTHING WRONG WITH THE ACADEMIC CORE OF THE UFS’s MBA PROGRAMMES?

No. The UFS is proud of its three MBA programmes’ reputation in the market and the positive feedback it receives from graduandi and their employers.

The MBA programmes of the UFS meet most of the minimum requirements of the evaluation process.

In particular, the key element of ‘teaching and learning’, which relates to the curriculum and content of the MBA programmes, is beyond question. In other words, the core of what is being taught in our MBA programmes is sound.

4. IS THE UFS’s MBA A WORTHWHILE QUALIFICATION?

Yes. Earlier this year, the School of Management – young as it is - was rated by employers as the best smaller business school in South Africa. This was based on a survey conducted by the Professional Management Review and reported in the Sunday Times Business Times, of 25 January 2004.

The UFS is committed to maintaining these high standards of quality, not only through compliance with the requirements of the CHE, but also through implementing its own quality assurance measures.

Another way in which we benchmark the quality of our MBA programmes is through the partnerships we have formed with institutions such as the DePaul University in Chicago and Kansas State University, both in the US, as well as the Robert Schuman University in France.

For this reason the UFS appreciates and supports the work of the CHE and welcomes its specific findings regarding the three MBA programmes.

It is understandable that the MBA review has caused some nervousness – not least among current MBA students throughout the country.

However, one principle that the UFS management is committed to is this: preparing all our students for a world of challenge and change. Without any doubt the MBA programme of the UFS is a solid preparation.

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