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23 November 2021 | Story Leonie Bolleurs | Photo Tania Allen
Dr Jana Vermaas and Ketshepileone Matlhoko are working on research that leaves your washing clean and fresh without the use of any detergents, which is also beneficial to the environment.

Cold water or hot water? Omo or Skip? Laundry blues is a reality in most households and when you add stains to the equation, then what was supposed to be part of your weekly household routine, becomes frustrating and time consuming. 

Researchers at the University of the Free State (UFS) are conducting research that is putting a whole new environmentally friendly spin on laundry day.

Sustainability and environmental conservation

Dr Jana Vermaas, Lecturer in the Department of Sustainable Food Systems and Development at the UFS, is passionate about textiles and sustainability – almost a decade ago, she conducted a study on the efficacy of anolyte as a disinfectant for textiles.

She describes the process: “During electrochemical activation, a dilute solution of natrium chloride/salt passes through a cylindrical electrolytic cell where the anodic and cathodic chambers are separated. Two separate streams of electrochemically activated water are produced. Anolyte as water was produced at the positive electrode and has a low pH, high oxidation-reduction potential and contains dissolved chloride, oxygen, and hydroxyl radical. It also has an antimicrobial effect.”

The benefits of this process are in line with her enthusiasm for environmental conservation. 

According to Dr Vermaas, the amount of water and chemicals used to clean textile articles is massive. “Chemicals used to disinfect, for example, hospital laundry, are hazardous. Not all laundries in the industry have a closed loop system or try to remove the chemicals before the wastewater is discarded.”

“Different amounts of detergents have various effects on our fauna and flora. Due to their low biodegradability, toxicity, and high absorbance of particles, detergents can reduce the natural water quality, cause pH changes in soil and water, lead to eutrophication (too many nutrients), reduce light transmission, and increase salinity in water sources.”

“But with the catholyte and anolyte process, water returns to its original status, which means that the water solution becomes inactive again after production where it existed in a metastable state while containing many free radicals and a variety of molecules for 48 hours. Thus, no chemicals are left in the wastewater. The water can therefore be recycled, not as potable water but, for example, to flush toilets or to water plants.

“We should do what we can to save water,” she says. 

Should you, like Dr Vermaas, also feel strongly about protecting the environment and want to obtain one of these machines that leaves your washing clean and fresh without the use of any detergents, you will be able to find such an appliance in South Arica. However, it does not come cheap. “It is a bit costly for residential use, but might be more accessible in the future,” states Dr Vermaas, who is of the opinion that it is a more sustainable option for commercial laundries.

Detergency properties and colourfastness 

Recently, more research has been conducted on this topic, but with a focus on the detergency properties of the catholyte to clean different textile fibres (natural and synthetic). Catholyte, she explains, is water produced at the negative electrode with a high pH, low oxidation-reduction potential, containing alkaline minerals. It also has surface active agents that increase the wetting properties, and it is an antioxidant. 

“A master’s student in the department, Ketshepileone Matlhoko, will be submitting her dissertation at the end of November on the possibility of using the catholyte as a scouring agent to clean raw wool,” says Dr Vermaas. 

The department is also conducting studies to investigate the influence of both catholyte and anolyte on colourfastness.

*Graphic: Production of electrolysed water (Nakae and Indaba, 2000). Diagram: Supplied



News Archive

Famelab, the Pop Idols of science communication
2017-03-09

Description: Famelab Tags: UFS, CUT, Science, Competition, research, British Council, Famelab, NRF

Oluwasegun Kuloyo and Zanele Matsane proved to be
Bloemfontein’s young and wittiest science researchers.
They will represent the Free State at the Famelab
national semifinals in Johannesburg.
Photo: Oteng Mpete

Imagine sharks with laser beams attached to their heads and enzymes that wear coats, and yeasts that stage a coup d’état in your body when agitated. This was all explored at the FameLab Science Communication Competition. 

Hosting the FameLab regional competition was a collaborative effort between Dr Mikateko Hoppener, from the University of the Free State’s (UFS), the Centre for Research on Higher Education and Development (CRHED), and Edith Sempe from the Central University of Technology (CUT), Research and Development Unit. Taking place for the first time in the Free State, the event was held at the UFS Centenary Complex on 2 March 2017.

Witty minds make science fun

FameLab is a competition that promotes science and technology by creating a space for scientists to find their voices and reach public audiences. The Free State regional competition had 18 contestants and two emerged victorious on the day. Contestants had to ensure their three-minute talks were fun, charismatic, clear and entertaining.

The two regional winners were Oluwasegun Kuloyo, a PhD student with the department of Microbial Biochemical and Food Biotechnology at UFS, and Zanele Matsane, a Construction Management PhD student at CUT. 

Kuloyo's research deals with the management of the candida yeast which exists in most people’s bodies and which, with a healthy immune system can be kept under control, but when an immune system is compromised, the yeast reacts volatilely and can potentially lead to death in HIV/AIDS patients. 

Matsane’s research is centred on collaborative construction management inspired by the Toyota manufacturing process. She hopes to resolve the silos of construction and bring about a more harmonious and fluid process to construction projects, thus ensuring their successful completion. 

The panel of judges consisted of Oteng Mpete UFS Media Liaison Officer, Dr Elizabeth Conradie from the CUT Innovation Hub, and Prof Willie du Preez from the CUT Centre for Rapid Prototyping and Manufacturing, as well as Robert Inglis from JiveMedia Africa.

Local scientists become jet-setters 
The two regional winners will head to Johannesburg to compete at the FameLab national semifinals, and the South African winner will go on to compete against winners from over 30 countries on an international stage, at the Cheltenham Science Festival in the UK.

FameLab is a programme of the Cheltenham Science Festival and is implemented locally by the South African Agency for Science and Technology Advancement (SAASTA), the British Council, and JiveMedia Africa. The competition has been running in South Africa for the past five years.

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