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Stabilization/solidification of acid tars
Sunday A Leonard1, Julia A Stegemann
1Department of Civil, Environmental and Geomatic Engineering, University College London, United Kingdom.
This study shows how stabilization/solidification (S/S) using Portland cement and high carbon fly ash effectively treats acid tars (AT). The treated waste can be safely managed in landfills, demonstrating a viable waste management strategy.
Area of Science:
- Environmental Engineering
- Waste Management
- Materials Science
Background:
- Acid tars (AT) are challenging petroleum processing wastes.
- Effective treatment methods are needed for AT disposal.
- Industrial by-products like high carbon fly ash (HCFA) offer potential solutions.
Purpose of the Study:
- To conduct a systematic treatability study on stabilizing/solidifying acid tars (AT).
- To investigate the use of Portland cement (CEM I) and high carbon fly ash (HCFA) for AT treatment.
- To assess the performance and management options for the stabilized/solidified (s/s) products.
Main Methods:
- Factorial design experiment to study effects of organic content, HCFA:AT ratio, CEM I percentage, and curing time.
- Evaluation of unconfined compressive strength (UCS), hydraulic conductivity, porosity, and leachability.
- Assessment of management options based on performance criteria.
Main Results:
- All studied factors significantly impacted the properties of the s/s products.
- Acid tar reduced UCS, but strength increased with curing time.
- Increased HCFA addition improved hydraulic conductivity.
Conclusions:
- The S/S process with CEM I and HCFA is effective for treating AT.
- Treated AT can be utilized in controlled low-strength materials, landfill liners, and daily cover.
- A systematic treatability study can define an S/S operating window for specific waste types.
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