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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

Increase in external research funding is proof of confidence in UFS
2014-12-09

The university’s sourcing of research funding from external organisations has received a significant boost this year. The growth in financing received from the National Research Foundation (NRF) alone increased from R24 million in 2013 to over R50 million in 2014.

“Because tertiary institutions can no longer survive on state subsidies alone, they are increasingly looking at alternative ways of supplementing their income. Income from these sources is utilised for various programmes and projects, with strong emphasis on research,” says Dr Glen Taylor, Senior Director: Research Development at the University of the Free State (UFS).

A source which provided considerable income for the UFS was the presentation of short learning programmes. The growth in income for the learning programmes this year was more than 30% compared to the income in 2012. “Income from short learning programmes is used to support the core business of the UFS,” says Dr Taylor.

A number of major research contracts were entered into during the course of the year. The UFS, for example, serves as an agency for a research contract of USD$10.5 million awarded by the World Bank to the Southern African Development Corporation (SADC). The contract is managed by the Institute for Groundwater Studies (IGS) and involves research on the management and formation of policies on underground water sources across boundaries.

Another substantial grant is the financing received from the Water Research Commission. The money is used to conduct research on the sustainable utilisation of water, as well as ways for the better utilisation thereof for the development of communities. The grant to the UFS for successful projects amounts to R5.5 million on average per year.

The UFS also has contracts with national and international partners. We conduct research of more than R30 million on the behalf of several mining companies, such as Anglo American, BHP Billiton, Exxaro and Goldfields Ltd. “Furthermore, we also have research funding from the National Institute of Health (NIH) in the USA, the European Union and several bilateral research agreements with countries such as Brazil, China and India, as well as contracts with Sasol and the Agricultural Research Council (ARC),” says Dr Taylor.

“We have tremendous interest from several companies wishing to finance the programmes, projects and intellectual property of the UFS, which is proof that our research is recognised and makes a difference,” he says.

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