Evaluating the applicability of a modified toxicity characteristic leaching procedure (TCLP) for the classification of cementitious wastes containing lead and cadmium.
Having the toxicity characteristic leaching procedure (TCLP) as a starting point, this study examined the effect of the various leaching parameters on the leaching of Pb and Cd from cementitious wastes. Using modified TCLP procedures, the parameters investigated were the acid concentration, leaching duration, particle size of the crushed waste, liquid to solid ratio, and the acid type. The main finding was that the final leachate pH controls the leachability of metals due to its influence on their solubility. The high alkalinity of cementitious waste buffers the leachate at a pH where most metals become insoluble. The TCLP was found to result in an unrealistic condition for cementitious wastes due to the high resultant leachate pH.
Halim
Cheryl E
CE
Centre for Particle and Catalyst Technologies, School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia.
Amal
Rose
R
Beydoun
Donia
D
Scott
Jason A
JA
Low
Gary
G
D002104:Cadmium / Q000032:analysis* / Q000633:toxicity; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000032:analysis* / Q000633:toxicity; D010316:Particle Size; D012037:Refuse Disposal; D012989:Soil Pollutants / Q000032:analysis* / Q000633:toxicity
D012989:Soil Pollutants; D002104:Cadmium; D007854:Lead