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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

Academic delivers inaugural lecture on South African foreign policy
2007-08-06

 

In her inaugural lecture Prof. Heidi Hudson from the Department of Political Sciences, focused on the impact that Pan-Africanist sentiments have had on South Africa’s foreign policy. She also put the resulting contradictions and ambiguities into context. At her inaugural lecture were, from the left: Proff. Frederick Fourie (Rector and Vice-Chancellor of the UFS), Heidi Hudson, Engela Pretorius (Vice-Dean: Faculty of The Humanities) and Daan Wessels (Research Associate in the Department of Political Science).
Photo: Stephen Collett

Academic delivers inaugural lecture on South African foreign policy

“We are committed to full participation as an equal partner … opposed to any efforts which might seek to project South Africa as some kind of superpower on our continent. … the people of Africa share a common destiny and must therefore … address their challenges … as a united force...” (Mbeki 1998:198-199).

Prof. Heidi Hudson from the Department of Political Science referred to this statement made by president Mbeki (made at the opening of the OAU Conference of Ministers of Information in 1995) when she delivered her inaugural lecture on the topic: South African foreign policy: The politics of Pan-Africanism and pragmatism.

One of the questions she asked is: “Can the South African state deliver democracy and welfare at home while simultaneously creating a stable, rules-based African community?”

She answers: “South Africa needs to reflect more critically and honestly on the dualism inherent in its ideological assumptions regarding relations with Africa. South Africa will always be expected by some to play a leadership role in Africa. At the moment, South Africa’s desire to be liked is hampering its role as leader of the continent.”

In her lecture she highlighted the ideological underpinnings and manifestations of South Africa’s foreign policy. Throughout she alluded to the risks associated with single-mindedly following an ideologically driven foreign policy. She emphasised that domestic or national interests are the victims in this process.

Prof. Hudson offers three broad options for South Africa to consider:

  • The Predator – the selfish bully promoting South African economic interest.
  • Mr Nice Guy – the non-hegemonic partner of the African boys club, multilaterally pursuing a pivotal but not dominant role.
  • The Hegemon - South Africa driving regional integration according to its values and favouring some African countries over others, and with checks and balances by civil society.

She chooses option three of hegemony. “Politically correct research views hegemony as bad and partnership as good. This is a romanticised notion – the two are not mutually exclusive,” she said.

However, she states that there have to be prerequisites to control the exercise of power. “The promotion of a counter-hegemon, such as Nigeria, is necessary. Nigeria has been more effective in some respects than South Africa in establishing its leadership, particularly in West Africa. Also needed is that government should be checked by civil society to avoid it sinking into authoritarianism. The case of business and labour coming to an agreement over the HIV/Aids issue is a positive example which illustrates that government cannot ignore civil society. But much more needs to be done in this regard. South Africa must also be very careful in how it uses its aid and should focus potential aid and development projects more explicitly in terms of promoting political stability,” she said.

Prof. Hudson said: “It is also questionable whether Mbeki’s Afro-centrism has in fact promoted the interests of ordinary citizens across Africa. Instead, elite interests in some countries have benefited. But ultimately, the single most important cost is the damage done to the moral code and ethical principles on which the South African Constitution and democracy is founded.

“In the end we all lose out. More pragmatism and less ideology in our relations within Africa may just be what are needed,” she said.

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