Abstract
Toxicity of leachate of municipal solid waste combustion fly ash was examined by quantitative analysis of heavy metals and the Daphnia toxicity test.
Comparing the concentrations of heavy metals with the regulatory levels for landfill restriction, it was expected that cadmium and lead would be the dominating causes for the toxicity of leachate. Zinc, which was not regulatory constituent, was also expected to be one of them because its concentration was much higher than other metals.
The Daphnia test, however, showed that the toxicity of the leachate was much higher than the toxicity expected form cadmium, lead and zinc concentrations.
These facts show that, in addition to chemical analysis, it is useful to conduct biological toxicity test to evaluate the toxicity of wastes.
