TOXICITY TEST WITH CERAMIC SLUDGES

The toxicity of the leachates of four ceramic sludges was studied. An extraction method similar to the EP method was used. The evolution of boron, lead, zinc, calcium and sodium during the extraction process wa s measured over a 72 hs duration. For each sludge, three tests were ca rried out: (a) at 25 degrees C with the non-ground sample, (b) at 25 d egrees C with the ground sample, and (c) at 40 degrees C with the non- ground sample. The toxicity of the leachates was also evaluated by a l uminiscence bioassay with Photobacterium Phosphoreum.