EVALUATION OF THE HOMOGENEITY OF STABILIZED SOLIDIFIED WASTES BY A VIDEO IMAGING TECHNIQUE

A video imaging technique is described for the homogeneity assessment of wastes that have been treated by stabilisation/solidification (S/S) . The method incorporates a fluorescent tracer into the S/S reagent. A test ''waste'' consisting of an artificial soil was stabilised/solidi fied with varying degrees of mixing using Portland cement as the S/S r eagent. The tracer distribution was monitored with a video camera, and the cement distribution was determined by chemical analysis for calci um. Measurement of the homogeneity of the products by the video imagin g technique gave results comparable to those obtained by the chemical analysis. The results warrant use of the video imaging technique in fi eld applications since it is easier, cheaper and faster than tradition al chemical methods. (C) 1995 ISWA