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07 March 2018 Photo Aden Ardenrich from Pexels
Is there a pollution solution
To make one cotton T-shirt up to 2 700 litres are used – that is two-and-a-half years of drinking water for one person.

Dr Cindé Greyling, a UFS DiMTEC (Disaster Management Training and Education Centre for Africa) alumni, studied drought mitigation – with a strong focus on communicating important water-saving information. 

Coming out of the closet

“We often point to the mining, agriculture, and energy sectors as water pollution culprits, which they are, but what about closer to home?” Dr Greyling asks. It is good if you take short showers, harvest rainwater, and are conscious about closing taps, but, she explains, there is a big problem hiding in your closet. Textiles. “It is difficult to put an exact number or ranking to it, but the textile industry could easily be in the top 10 water polluters. The cotton plant requires a lot of water and is one of the most chemically dependent crops in the world. Long before manufacturing starts, water is already at stake.” Not that polyester, or polyester blends are much better – when washed, thousands of microplastic fibers are released that eventually end up in our water sources and the oceans.

To dye for
“Most dyes used for textiles are also heavy water pollutants,” she explains. “And since we’ve developed a taste for cheap, mass-produced clothing, the production sites take strain – putting the community and environment at risk. When you wash these cheaply made garments, the same toxic dye is often visibly released.” The fashion industry is regularly criticised by animal activists for their insidious labour practices. But maybe it is time to help limit their environmental impact too.  

One in, one out
“We must unlearn our fashion gluttony. There is no pride in having a wardrobe full of clothes that you do not wear. Buy less, buy better quality, and care for your clothes so that you don’t have to replace them that often. To make one cotton T-shirt, up to 2 700 liters is used – that is 2 ½ years of drinking water for one person. My household applies a ‘one-in-one-out’ rule. You can only buy, for example, a new pair of denim jeans, if you take an old pair out that you either donate or repurpose. It works very well – you think twice about purchasing.”

A helping hand
Dr Greyling thinks that beside individual efforts, the UFS community can contribute a lot toward reducing textile water pollution, such as opening a pre-used clothing bank on campus. “Students are very influential and can easily create a ‘cool to re-use’ fashion trend, even if just locally. Also, research students can further explore and develop textile alternatives like bamboo, hemp, or a more water-friendly synthetic.” 

News Archive

Water erosion research help determine future of dams
2017-03-07

Description: Dr Jay le Roux Tags: Dr Jay le Roux

Dr Jay le Roux, one of 31 new NRF-rated
researchers at the University of the Free State,
aims for a higher rating from the NRF.
Photo: Rulanzen Martin

“This rating will motivate me to do more research, to improve outcomes, and to aim for a higher C-rating.” This was the response of Dr Jay le Roux, who was recently graded as an Y2-rated researcher by the National Research Foundation (NRF).

Dr Le Roux, senior lecturer in the Department of Geography at the University of the Free State (UFS), is one of 31 new NRF-rated researchers at the UFS. “This grading will make it possible to focus on more specific research during field research and to come in contact with other experts. Researchers are graded on their potential or contribution in their respective fields,” he said.

Research assess different techniques
His research on water erosion risk in South Africa (SA) is a methodological framework with three hierarchal levels presented. It was done in collaboration with the University of Pretoria (UP), Water Research Commission, Department of Agriculture, Forestry and Fisheries, and recently Rhodes University and the Department of Environmental Affairs. Dr Le Roux was registered for 5 years at UP, while working full-time for the Agricultural Research Council – Institute for Soil, Climate and Water (ARC-ISCW).

Water erosion risk assessment in South Africa: towards a methodological framework
, illustrates the most feasible erosion assessment techniques and input datasets that can be used to map water erosion features in SA. It also emphasises the simplicity required for application at a regional scale, with proper incorporation of the most important erosion-causal factors.

The main feature that distinguishes this approach from previous studies is the fact that this study interprets erosion features as individual sediment sources. Modelling the sediment yield contribution from gully erosion (also known as dongas) with emphasis on connectivity and sediment transport, can be considered as an important step towards the assessment of sediment produce at regional scale. 
 
Dams a pivotal element in river networks

Soil is an important, but limited natural resource in SA. Soil erosion not only involves loss of fertile topsoil and reduction of soil productivity, but is also coupled with serious off-site impacts related to increased mobilisation of sediment and delivery to rivers.

The siltation of dams is a big problem in SA, especially dams that are located in eroded catchment areas. Dr Le Roux recently developed a model to assess sediment yield contribution from gully erosion at a large catchment scale. “The Mzimvubu River Catchment is the only large river network in SA on record without a dam.” The flow and sediment yield in the catchment made it possible to estimate dam life expectancies on between 43 and 55 years for future dams in the area.
 
Future model to assess soil erosion
“I plan to finalise a soil erosion model that will determine the sediment yield of gully erosion on a bigger scale.” It will be useful to determine the lifespan of dams where gully erosion is a big problem. Two of his PhD students are currently working on project proposals to assess soil erosion with the help of remote sensing techniques.

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