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Putting an environmental spin on laundry days

23 November 2021 | Story Leonie Bolleurs | Photo Tania Allen

Laundry research_web read more — 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

Exciting open day and Albert Einstein program at Boyden Observatory

2005-05-06

National Science Week, which will be held from 7-14 May 2005, is an annual country-wide celebration of science, led by the Department of Science and Technology. The department selected a proposal by the Boyden Science Centre to coordinate a week of activities in the Bloemfontein area as one of the many projects in the country.

The project for Bloemfontein and surrounding areas will be delivered though a collaboration between the National Museum in Bloemfontein and the University of the Free State (UFS), including the Research Institute for Education Planning, the Department of Physics and other departments in the Faculty of Natural and Agricultural Sciences.

The purpose of National Science Week is:

to create awareness of the important role that science play in people’s daily lives;
to encourage our youth to consider studying and improving their performance in mathematics and science; and
to attract more of our youth into science, engineering and technology (SET) careers.

World Year of Physics and Albert Einstein Program at Boyden Observatory

The International Union of Pure and Applied Physics (IUPAP) declared the year 2005 as the World Year of Physics (WYP). In recognition of this declaration, the great contribution of Physics to the development of technology, and its importance in our everyday lives will be featured strongly during the National Science Week 2005.

On Saturday 7 May 2005 there will be a public programme at Boyden Observatory from 15:30 as a contribution to the World Year of Physics. The programme will be presented in collaboration with the Bloemfontein branch of the Astronomical Society of Southern Africa and will include short presentations on astronomy, space exploration and the sun.

The main presentation will be at 19:00 the evening on the life and work of Albert Einstein. The programme will also include observing sessions through telescopes of objects like the sun, Jupiter and Saturn. There will also be an exhibit on Albert Einstein. Attendance is free but booking is required. For bookings, phone 051-4012561.

Public lecture programme:

Next week the following exciting public lectures will be presented as part of the Science Week activities:

Monday 9 May 2005

National Museum:

A discussion on Apocalypse Then: the greatest mass extinction of all time. The lecture will be presented by Dr Jennifer Botha, Paleontologist at the National Museum.
Bookings: 051-4479609 (entrance is free).

UFS campus:

All lectures at Kine 2, Medical Faculty, UFS campus. Follow directions from the DF Malherbe Road entrance.
Bookings: 051-4012561 (entrance is free).

Tuesday 10 May 2005:

A discussion on the Tsunami disaster of 26 December 2004 at 19:30 (UFS campus, Kine 2 Medical Faculty).

Wednesday 11 May 2005:

A discussion on Is there life out there? at 19:30 (UFS campus, Kine 2 Medical Faculty).

Friday 13 May 2005:

A discussion on Hunting Black Holes at 19:30 (UFS campus, Kine 2 Medical Faculty). The lecture will be presented by Dr Phil Charles, Director: South African Astronomical Observatory.

Science awareness day at the National museum

The science week will be concluded on Saturday 14 May 2005 with a special Science Awareness Day at the National Museum, Aliwal Street, Bloemfontein.

The excellent exhibits at the museum will be supplemented with activities, career information and video shows. The duration of the programme will be from 10:00-16:00. For enquiries, please call 051-4479609.

Issued by:  Lacea Loader
   Media Representative
   Tel: (051) 401-2584
   Cell: 083 645 2454
   E-mail: loaderl.stg@mail.uovs.ac.za

6 May 2005

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