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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

Students receive hands-on crime scene investigation training
2016-09-02

Description: Crime scene investigation training Tags: Crime scene investigation training

Ntau Mafisa, a forensic science honours student
at the UFS, and Captain Samuel Sethunya from
the SAPS Crime Scene Management in
Bloemfontein.
Photo: Leonie Bolleurs

With murder and robbery rates on the rise, the Forensic Science Programme of the Department of Genetics at the University of the Free State is playing a key role in training South Africa’s future crime scene investigators and forensic laboratory analysts.

According to the Institute for Security Studies (ISS), murder and aggravated robbery rates for 2014/2015, as recorded by the South African Police Services (SAPS) have increased. Incidents of murder increased by 4.6% in the period from 2013/2014 to 2014/2015 and aggravated robbery increased by 8.5 % in the same period. The ISS is an African organisation thant enhances human security by providing independent and authoritative research, expert policy advice and capacity building.

Dr Ellen Mwenesongole, a forensic science lecturer at the Department of Genetics, said the university was one of a few universities in South Africa that actually had a forensic science programme, especially starting from undergraduate level.

Crime scene evaluation component incorporated in curriculum
As part of its Forensic Science Honours Programme, the department has, for the first time, incorporated a mock crime scene evaluation component in its curriculum. Students process a mock crime scene and are assessed based on how closely they follow standard operating procedures related to crime scenes and subsequent laboratory analysis of items of possible evidential value.

The mock crime scene forms part of a research project data collection of the honours students. In these projects students utilise different analytical methods to analyse and distinguish between different types of evidence such as hair fibres, cigarette butts, illicit drugs and dyes extracted from questioned documents and lipsticks.

Students utilise different analytical methods to analyse
and distinguish between different types of evidence.

This year, the department trained the first group of nine students in the Forensic Science Honours Programme. Dr Mwenesongole, who received her training in the UK at the University of Strathclyde in Glasgow, Scotland, and Anglia Ruskin University in Cambridge, England, said incorporating a crime scene evaluation component into the curriculum was a global trend at universities that were offering forensic science programmes.

Department of Genetics and SAPS collaborate
It is important to add this component to the student’s curriculum. In this way the university is equipping students not only with theoretical knowledge but practical knowledge on the importance of following proper protocol when collecting evidence at crime scenes and analysing it in the laboratory to reduce the risk of it becoming inadmissible in a court of law.

The Genetics Department has a good working relationship with the Forensic Science Laboratory and Free State Crime Scene Management of the Division Forensic Services of the SAPS. The mock crime scene was set up and assessed in collaboration with the Crime Scene Management Division of the SAPS. Although the SAPS provides specialist advanced training to its staff members, the university hopes to improve employability for students through such programmes.

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