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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

Graduation ceremony awaited with great excitement
2011-06-22

Everything is running according to plan on the Bloemfontein Campus of our university for the graduation ceremony of Ms Oprah Winfrey, which is taking place in the Callie Human Centre today, 24 June 2011. 

The graduation ceremony, during which an Honorary Doctorate in Education will be conferred upon Ms Winfrey, promises to be something special. Measured against the smooth course of the preparations, the speed at which the tickets were obtained and the continuous interest amongst UFS staff and students, as well as members of the public, this promises to be a real 2011 highlight for all who are going to attend the event. 

Strict safety and security measures shall be enforced and therefore, ticket holders are requested to make sure that they arrive early on the Bloemfontein Campus. 

The UFS is aware of the fact that tickets are sold illegally at shopping centres in Bloemfontein. Computicket equipment shall be used on the premises tomorrow to ensure that only persons who have original tickets in their possession are admitted. People found to be in possession of forged tickets tomorrow shall be prosecuted. 

The doors of the Callie Human Centre shall open at 13:00 on Friday for ticket holders and shall be closed strictly at 14:00. For safety and security reasons, nobody shall be allowed to enter or leave the building after the doors were closed. 

Although the entrance gates to the Bloemfontein Campus shall not be closed, certain streets on the campus will be closed for some time today (23 June 2011) and the whole of Friday (24 June 2011). More information about this is available at www.ufs.ac.za 

Clear signs, as well as voluntary staff, shall guide parking visitors to their parking spaces. The volunteers were selected after staff of all three campuses offered their assistance for the day. 

Amongst the 4 500 guests attending the graduation ceremony are various well-known personalities and dignitaries, alumni, learners and other stakeholders of the university. Good reaction has also been received from the local, national and international media. 

The programme in the Callie Human Centre is as follows: 

13:00 Doors open
14:00 Doors close
14:30 Opening performances
15:30 Graduation ceremony
16:00 Ms. Winfrey’s speech and question and answer session with students
18:00 Programme ends.
 

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