DEVELOPMENT OF THE ADTI-WP1 (HUMIDITY CELL) AND ADTI-WP2 (LEACHING COLUMN)STANDARD WEATHERING PROCEDURES FOR COAL MINE DRAINAGE PREDICTION

摘要

Two weathering procedures are being developed by the AcidDrainage Technology Initiative in cooperation with federal agencies(OSM and EPA). Objects are to: (1) standardize existing humiditycell and leaching column procedures; (2) improve test methods bymaintaining a carbon dioxide enriched environment needed tooptimize carbonate mineral dissolution, and quantifying particle sizevariables to evaluate reaction kinetics, and (3) provide flexibility intest method implementation consistent with EPA guidelines forPerformance-Based Measurement Systems. Preliminary resultsindicate the CO_2 enriched leaching environments produce alkalinitiesthat are similar to field observations and greater than the tests rununder atmospheric PCO_2. Leaching columns produce higheralkalinity than humidity cells.