Investigation into the extraction of tar from asphalt waste using soil washing technique

Elt, Dominic (2016) Investigation into the extraction of tar from asphalt waste using soil washing technique. BEng dissertation, University of Portsmouth.

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    The purpose of this project was to determine whether soil washing can be used to extract tar from contaminated asphalt waste thus reducing the polycyclic aromatic hydrocarbon (PAH) content. This could lead to a new recycling technique and furthermore a reduction in the amount of contaminated asphalt waste going to landfill.
    There are three main objectives in this investigation –
     To investigate if soil washing technique could be applied to clean contaminated tar-bound aggregate.
     To test if bitumen could be extracted from asphalt waste.
     To examine if biological surfactant could treat on tar-bound materials.
    A methodology was developed in order to try to meet the above objectives. A sample of contaminated asphalt waste was crushed and washed in an ultrasonic bath for 20minute cycles. Two different washing fluids were used for washing the material, distilled water and a bio surfactant, saponin. Up to three wash cycles were tested for each washing fluid at temperatures of 50°C, 70°C and 100°C. The change in mass was then used to determine the amount of contaminant removed.
    From the tests carried out it three wash cycles at 100°C using distilled water was the most effective combination, inducing a change in mass of 1.023%. It was therefore concluded soil washing can be used to reduce the binder material content from contaminated asphalt waste and this technology could possibly be developed to create a new recycling technique.
    However there are a few limitations to this study. The main limitation being, this project does not determine the exact reduction of contaminant concentration in the washed asphalt waste. Washed material should be analysed in order to find the full extent of the soil washing procedure carried out.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 01 Sep 2016 13:40
    Last Modified: 01 Sep 2016 13:40

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