Abstract
The Japanese leaching test 13(JLT-13) and chemical analysis are carried out determine the content of heavy metals and organic compounds to assess whether these wastes can be safely disposed of. No bioassay has been standardized for waste management in Japan. We examined the toxicity of several industrial wastes and recovered materials, including fly ash, bottom ash, shredder residue, construction and demolition waste, gypsum board, wood waste, and dewatered sludge to assess. Tree toxicity tests (D. magna immobilization test, algal growth inhibition test and human cell line Hep G-2 cytotoxicity test) and a specific bioassay such as EROD activity test in Hep G2 cell line are used. And also we performed total organic carbon (TOC), heavy metals, phenols and poly aromatic carbons(PAHs) in eluates by JLT-13. The concentrations of metals are lower than that of the Japanese standard except Pb in the fly ash and, the toxicities observed in the eluate of dewatered sludge wasn't derived from salinity and heavy metals besides PAHs. The results of Zn suggest that wood waste and dewatered sludge had potential. Some controversial results such as the overgrowth in the algal growth inhibition test and effect of salinity to the cell line indicate the necessity for modification of the test media used. It is important showing the thresholds of saline for each test.
