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Organic interference of solidified/stabilized hazardous wastes.
H C Eaton1, M B Walsh, M E Tittlebaum
1Hazardous Waste Research Center, College of Engineering, Louisiana State University, 70803, Baton Rouge, LA, USA.
Environmental Monitoring and Assessment
|November 21, 2013
Summary
Solidifying liquid hazardous waste with cement is crucial for landfill disposal. Organic contaminants can disrupt this process, impacting the stability of solidified waste.
Area of Science:
- Environmental Science
- Materials Science
- Geochemistry
Background:
- Liquid hazardous waste requires solidification/stabilization before landfill disposal.
- The mechanisms of waste solidification processes, particularly with cement, are not fully understood.
- Organic compounds can interfere with the reactions between inorganic sludges and cementitious binders.
Purpose of the Study:
- To investigate the interaction between organic hazardous wastes and Type I Portland cement.
- To understand how organic liquids affect the microstructure of cement matrices.
- To provide data on the ultimate stability of solidified hazardous waste constituents.
Main Methods:
- Microscopic analysis using a scanning electron microscope (SEM).
- Observation of cement samples fractured at low temperatures (78K).
- Comparison of cement set with water versus cement set with water and organic liquids.
Main Results:
- Observed structural differences in cement matrices when organic liquids are present.
- Identified interference of organic compounds in cement hydration and matrix formation.
- Provided visual evidence of microstructural changes due to organic contaminants.
Conclusions:
- Organic hazardous wastes significantly alter the microstructure of Portland cement.
- Understanding these interactions is key to ensuring the long-term stability of solidified hazardous waste.
- The study offers critical data for optimizing solidification/stabilization processes for hazardous waste management.
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