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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

Cochlear implant changes Magteld's world
2009-11-06

The microphone is ready for Magteld Smith’s (second from the left) first radio interview after the cochlear implant was switched on by Mr Henk Wolmarans (right) of MedEl. With them are, from the left: Ms Vicki Fourie, Deaf Miss SA, Ms Eunika Smith from the SABC and Prof. Jonathan Jansen.
Photo: Leatitia Pienaar


Magteld Smith gave her first steps towards the world of the hearing when her cochlear implant was switched on in the Universitas Hospital this week.

A whole team was there to share her joy and disbelief and amazement the moment she could hear noises, voices and conversations. Among them were the Rector and Vice-Chancellor of the University of the Free State (UFS), Prof. Jonathan Jansen, and the acting dean of the Faculty of Heath Sciences at the UFS, Prof. Gert van Zyl.

“I can hear my own voice! I haven’t heard it for a long time. My wish is that every deaf child can get something like this,” she said while prodding Prof. Jansen to speak so that she can hear his voice.

Magteld is working at the university's Centre for Health Systems Research and Development and was deaf since birth. She lost her last bit of hearing due to meningitis last year. Her hearing aids could then not assist her to communicate and a cochlear implant was the only option.

A donation by the Austrian company MedEl made the implant possible. Prof. André Claassen, Head of the Department of Otorhinolaryngology at the UFS, says MedEl was also instrumental in the establishment of the implant programme at the Universitas Hospital and sponsored the first five implants at a total cost of R1 million.

Prof. Claassen says 27 implants have already been done here, but it came to an abrupt halt due to a lack of funds. Strong hearing aids are expensive and cochlear implants are even more expensive at R200 000 each. People with hearing disabilities must be identified at an early age as the brain’s ability to learn sound and voice diminishes after the age of three.
 

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