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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

Invitation to International Cardiothoracic congress
2011-06-01

Our Faculty of Health Sciences is pleased to announce the European Association for Cardiothoracic Surgeons Academy (EACTS) and Hannes Meyer Cardiothoracic Surgery Registrar Symposium, which will be taking place on our Bloemfontein Campus from 3 to 5 June 2011.

The congress first started in 2004 as the Hannes Meyer Registrar Congress, which was jointly hosted by the UFS and the Society of Cardiothoracic Surgeons of South Africa. This event was hosted on our Bloemfontein Campus annually, except in 2009, when the University of Cape Town was the host.

The focus of this year’s symposium is new techniques in perfusion and surgery, with specific emphasis on research methodology, inflammatory lung disease and cardiac surgery in children and adults, which can be performed without the aid of a heart-lung machine in developing countries.

Prof. Francis Smit, Head of the Department of Cardiothoracic Surgery in the Faculty of Health Sciences, says EACTS identified the UFS as the Sub-Saharan training unit they will support in terms of training. The first of these symposiums was accordingly hosted in 2010.

This year’s symposium will be attended by approximately 70 delegates from cardiothoracic units from across South Africa and 10 doctors from 6 African countries, as well as 30 perfusion technologists.

“We are fulfilling a leadership role in Africa and South Africa with this course,” says Prof. Smit.

Several international visitors will be present, like Prof. Paul Sergeant and Prof. Marko Turina, two previous EACTS presidents and Prof. Charles Yankah, a Ghanaian Cardiothoracic Surgeon from the Charite Medical University in Berlin. The current president of the European Board of Cardiovascular Perfusion (EBCP), Mr Frank Merkle, will also be one of three international speakers delivering lectures on perfusion technology.

You are invited to attend the conference on the following dates:

 
Date: 3 - 5 June 2011

Time: 09:00

Venue: Faculty of Health Sciences in the Francois Retief Building on our Bloemfontein Campus

 


 

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