In this study, the toxicity of extracts of sewage sludge, bottom
ashes from woodchip gasification and sludge/woodchip co-gasification on human cells was investigated. The results show that both
the sewage sludge extract and bottom ashes from gasification exhibit
toxic effects on the human HepG2 and MRC-5 cells, at high concentrations
in the culture medium. As a result, cell viability
decreased significantly associated with abnormal cell morphology
was observed.