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Sustainable treatment of toxic tyre chemicals in water

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Vehicle pollution is a growing environmental threat. Most research has focused on exhaust emissions. However, emissions form tyres have largely been overlooked and now pose the greatest pollution burden from vehicles. Therefore, there is an urgent need to address the impacts of tyre pollution to protect the environment.

Award
MRes | MPhil | PhD | MSc by Research
Start Date
Usually February and October - at individual School's discretion

Summary

Tyre pollution is an emerging threat to the aquatic environment. Tiny tyre particles are produced during driving, and are washed from road surfaces into surrounding water environments. It is estimated that 1 trillion tiny tyre particles are produced by a single car for every kilometre driven and there are a predicted 500 billion miles driven in the UK every year. Despite the staggering scale of tyre pollution, it has received relatively little attention to date. A major concern is the presence of small organic chemicals that are added during the manufacture of tyres to improve their performance (e.g., durability). These chemicals leach from tyre particles into water and biological fluids and are toxic to exposed organisms at low concentrations. For example, 6PPD-quinone a transformation product of an antioxidant additive, has an LC50 (median lethal concentration) of 0.095 碌g/L to juvenile Coho Salmon (Oncorhynchus kisutch) 1.

This is higher than concentrations found in the environment. Our research has found tyre particles and several tyre additive chemicals in roadside retention ponds used to manage road runoff. Despite high retention of tyre particles, the discharged water from retention ponds contains tyre chemicals. These retention ponds are an essential opportunity to eliminate tyre chemicals and protect the wider environment. Therefore, the aim of this PhD project is to develop a sustainable nature-based treatment method for the elimination of tyre chemicals which can be easily applied to existing retention ponds as well as being incorporated into the design of new ponds. Biochar is proposed as an effective treatment substrate which has proven capacity for pollutant adsorption and biodegradation in water 2.

Objectives

  • To optimise biochar production and characteristics for elimination of tyre chemicals during long-term use in ponds. 
  • To implement a local process for large scale biochar production using low value agricultural byproducts. 
  • To develop biochar treatment configuration(s) at pilot-scale and assess their efficacy for tyre chemical elimination. 

Requirements

We are seeking an enthusiastic and self-motivated individual to undertake this exciting interdisciplinary project. A background in Chemistry and/or Engineering and/or Microbiology is required. You will have at least an upper second-class honours degree and/or an MSc degree in a relevant topic. Knowledge and experience of liquid chromatography with mass spectrometry detection is a significant advantage. This will be primarily a laboratory-driven project with a considerable amount of field work conducted in collaboration with our industrial partners therefore we expect a consistent in-person attendance during your studies. You will have clear personal goals directing your interest in research. Good team working skills, observational and communication skills (oral and written) are essential.

References

  • [1] Tian Z., et al (2022) Environ Sci Technol Lett 9 (2), 140-146.
  • [2] Moore J., et al (2023) Environ Sci Technol Lett 57 (43), 16372-16385.

Supervisors

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