Thesis
Does in-situ ozone have a place in remediation within Scotland?
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2011
- Thesis identifier
- T13315
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- The need to allow further development in support of the continued economic growth of Scotland is seen as a key requirement for the Scottish Governments economic plans. This requirement to allow for development is constrained due to limitations in the availability of new land to be developed. This constraint is the result of a combination of sometimes conflicting factors including population increase, planning controls, the lack of suitable land due to its current usage, and growing public opposition to the use of virgin land for new development. As a result there is now growing pressure for the re-use of existing land within the existing conurbations of Scotland. This can also be considered as a analogy for other smaller countries facing similar issues, where there is growing pressure to reuse both existing residential and industrial sites. The traditional techniques for the cleanup of these sites are becoming less viable and new solutions are now required. This study evaluated the effectiveness of dilute ozonation over a series of samples from a former oil refinery now scheduled for redevelopment. The impact of ozone treatment on the levels of total extractable petroleum hydrocarbons (TPHs) and polycyclic aromatic hydrocarbons (PAHs) concentrations in the soil was measured over time. Aeration without ozone and no treatment were evaluated as controls. Also as part of the study, the impact the ozone had on the microbiological populations and the physical properties of the soil were investigated. The result of the study showed that in the context of the West Coast of Scotland and its typically clayey soils, the use of dilute ozone is not effective to remediate hydrocarbon pollution on its own. Its use in combination with other techniques has the potential to deliver a more versatile toolset for the remediation of contaminated sites. Ozone treatment reduced TPH and PAH concentrations by 4% and 12% over a treatment period of 24 hours. Ozonation of clayey soils resulted in a 15% mass loss over a 24 hour treatment period and a chemical 'firing' of the soils was observed over longer treatment times. The impact of the ozone on the microbiological populations was found to be initially beneficial to the microbial populations and then harmful over extended periods of exposure. The examination of in-situ ozone as a remediation tool fits into a larger scenario where considerable work is ongoing in many institutes, working to both improve existing and develop new technologies which offer both lower per unit costs and more effective solutions to the challenges of reusing contaminated sites.
- Resource Type
- DOI
- Date Created
- 2011
- Former identifier
- 967031
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