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BENCH-SCALE TESTING OF SORBENT ADDITIVES FOR TRACE METAL CAPTURE AND RETENTION
Citation:
Venkatesh, S., G. Carroll, AND L. Waterland. BENCH-SCALE TESTING OF SORBENT ADDITIVES FOR TRACE METAL CAPTURE AND RETENTION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/082 (NTIS PB95226726), 1995.
Description:
The suitability of six minerals; silica, diatomaceous earth, kaolin, bauxite, alumina and attapulgite clay, as potential sorbents for the capture and immobilization of trace metals was evaluated. he behavior of five trace metals; arsenic, cadmium, chromium,, lead and nickel was tested. he objective of the test program was to evaluate the candidate sorbents for their ability to limit vaporization by retaining the trace metals in the mineral matrix, and the degree to which they retain the trace metals as measured by TCLP extraction. ench-scale tests were conducted in the IRF's thermal treatability unit. he test matrix was defined by varying the mineral-sorbent type, treatment temperature of 540 degrees, 700 degrees, and 870 degrees C, and chlorine concentration of the feed from 0 to 4 percent by weight of chlorine. he test results indicate that under specific conditions varying for each mineral, all of the minerals limit metal vaporization, and/or TCLP leachability. f these, kaolin and attapulgite clay were most successful, over most of the test matrix, in limiting both metal vaporization and TCLP leachability.
