A leaching protocol to evaluate fly ash reuse potential
- Stevens Inst. of Tech., Hoboken, NJ (United States). Center for Environmental Engineering
In the present study fly ash waste materials were used along with quicklime to immobilize Pb present in contaminated soil mixes. A leaching protocol was developed and implemented where fly ash reuse potential was evaluated in terms of the levels of Pb release under different leaching conditions. For regulatory compliance purposes, Pb release was evaluated using the Toxicity Characteristic Leaching Procedure (TCLP). Pb release was also evaluated for diffusion-controlled actual field conditions using the monolithic leach test ANS16.1. Finally, the long-term release of Pb and the hydraulic conductivity of the treated waste forms under infiltration conditions were evaluated using a monolith flow-through leaching test, similar to the flexible-wall hydraulic conductivity test. Overall, fly ash addition leads to improved Pb immobilization, especially in the presence of quicklime. The treated material is non-hazardous and treatment is effective for very long periods of time following treatment. Results presented herein, can be extended to apply for other fine grained wastes such as incinerator flyash, boiler slag, flue gas desulfurization wastes, etc. Furthermore, the leachability protocol developed can be applied to virtually any waste material.
- OSTI ID:
- 116372
- Report Number(s):
- CONF-9507173--; ISBN 0-7844-0095-4
- Country of Publication:
- United States
- Language:
- English
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