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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

State of our campuses: UFS closes campuses until Friday 28 October 2016 to readjust academic programme

2016-10-15

UFS announces strategy for completion of the 2016 academic year

Agreement between UFS management and student leadership in relation to residences

After almost four weeks of student protests about fees at the University of the Free State (UFS) and the subsequent suspension of the academic programme and closing of campuses, the senior leadership announced on 14 October 2016 a strategy to ensure that students will be able to complete the 2016 academic year.

The university on 13 October 2016 announced that it will shut down its Bloemfontein and South Campuses until 28 October 2016 for crucial and complex arrangements to be put in place to readjust the academic calendar and ensure that all students can complete their studies. The senior leadership did, however, make it clear that the university will not be shutting down for the remainder of 2016.

No teaching and learning activities at undergraduate and honours level will be offered between 17 October and 28 October 2016. The university will re-start teaching and learning at undergraduate and honours level in the first week of November 2016.

However, teaching and learning will not take place in the classrooms during November 2016, but through a different mode of delivery that consists of a combination of printed and recorded lectures, study materials and learning aids that will be provided by the university and delivered through Blackboard. In this manner no attempts at disrupting the rest of the academic year will affect our students’ academic programme. Students, however, will sit for the exam on campus.

Students in residence accommodation can return to campus as from 29 October 2016 and it is recommended that students who do not have off-campus internet access return to campus in order to access study material to complete the academic year.A new timetable for exams is still being developed and will be communicated as soon as the arrangements have been finalised.

Faculties have been differently affected by the loss of teaching time. Some faculties like the Faculty of Law have completed their curriculum, while other faculties like the Faculty of Natural and Agricultural Sciences require more teaching time. Some faculties, like the Faculty of Health Sciences, cannot do teaching through alternative modes of delivery.

The needs of the different faculties have been taken into account for developing a rescue plan to complete the 2016 academic year.

The Faculty of Health Sciences will continue its classes and clinical rotations as normal for all three schools on the Bloemfontein Campus and in the relevant hospitals. All students registered in programmes in the Faculty of Health Sciences will stay in residences for the full period of their studies and exams. Final-year medical students will graduate in December 2016 as expected.
In the Faculty of Economic and Management Sciences, final-year students for the Certificate in the Theory of Accounting (CTA) will stay on campus during October through to December 2016 and their classes and tests will not change.
Arrangements for all other faculties and programmes are being prepared and within the next week, students and parents/guardians will receive communication about how curriculum content will be completed and when the final exams will take place.
The university is extending the academic year so that we can recuperate all the lost teaching and learning time. The qualifications conferred on the 2016 class will be of the same quality and standards as all UFS qualifications.

The UFS is and will remain a fundamentally contact teaching and learning education university. However, under the current circumstances faced not only by the UFS, but higher-education institutions across the country, the best way of ensuring the integrity of the academic programmes in most faculties is by using an alternative way of teaching and learning. Other South African universities have chosen the same approach to be able to complete the academic year.

Instead of students going to class, they will have content delivered to them where they are (library, computer labs, their own computers, etc.) through Blackboard and printed and electronic material. This is a different way of learning but students will be carefully guided and supported.

Faculties are currently preparing all the necessary materials and instructions to support student learning.Standards and quality will be the same as if students were attending classes. Some faculties require practical laboratory work as part of their curriculum. The exam timetable will be adapted for these students to be able to complete their practical work when the academic activities commences in November 2016. The relevant faculties will communicate the schedule of practical work directly to the students.

Students in their final year will complete their studies during 2016. It is possible that in some cases the graduation ceremony for these students will be in June 2017 instead of April 2017. This will not prejudice students with bursaries, or committed employment in law firms or other businesses. The university will provide the necessary academic transcripts as proof of the completion of the relevant qualifications. None of these changes will affect postgraduate students.

The university will maintain regular communication with students and parents/guardians to update them on the new exams timetable.Faculties will communicate directly with students about issues related to their programmes.

“One of the areas in which significant progress was made, is that we were able to agree on a basis for stability with student leaders. The student protests occurred during an important time in the university’s academic calendar and the readjustment of our academic programme has put tremendous pressure on academic and support services staff, and created anxieties for parents,” said Prof Nicky Morgan, Acting Rector of the UFS.

“The senior leadership restates its commitment to free education as well as its willingness to stand together with students and other public universities to impress on government the urgency to decide on a time frame for the roll-out of free higher education for the poor and missing middle. We will use the next two weeks to meet with the leadership of Universities South Africa to coordinate collective action in this regard. We will furthermore also roll out a series of activities to inform and educate students and the general public on different models and experiences of providing free higher education,” he said.

The strategy to readjust the 2016 academic year is applicable to students on the Bloemfontein and South Campuses.

Released by:
Lacea Loader (Director: Communication and Brand Management)
Telephone: +27 51 401 2584 | +27 83 645 2454
Email: news@ufs.ac.za | loaderl@ufs.ac.za
Fax: +27 51 444 6393

State of our campuses #15: UFS closes campuses until Friday 28 October 2016 to readjust academic programme

State of our campuses #14: All academic activities on UFS campuses remain suspended on 13 and 14 October 2016

State of our campuses #13: Availability of information about plans for remainder of UFS 2016 calendar year

State of our campuses #12: All academic activities at UFS campuses suspended for 11 and 12 October 2016

State of our campuses #11: Academic activities on UFS campuses continue

State of our campuses #10: Impact of non-completion of the 2016 academic year on UFS students

State of our campuses #9: Academic programme on all UFS campuses to resume on Monday 10 October 2016

State of our campuses #8: UFS extends vacation as from 28 September until 7 October 2016, 28 September 2016

State of our campuses #7: All three UFS campuses will be closed today, 27 September 2016.

State of our campuses #6: All UFS campuses reopen on Tuesday 27 September 2016

State of our campuses #5: UFS campuses to remain closed on Monday 26 September 2016

State of our campuses #4: Decisions about the UFS academic calendar

State of our campuses #3: UFS campuses closed until Friday 23 September 2016

State of our campuses #2: UFS Bloemfontein and South Campuses closed on Tuesday 20 September 2016 (19 September 2016)

State of our campuses #1: Academic activities suspended on UFS Bloemfontein Campus (19 September 2016)

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