Effective removal of fly ash by Penicillium chrysogenum and determination of direct fly ash toxicity with Daphnia magna

Abstract

This study demonstrates the removal of fly ash with Penicillium chrysogenum, a newly isolated species of fungus, and acute toxicity assessment with Daphnia magna. In the study, two different removal mechanisms were compared, both bio-removal and bio-sorption. Six different ash and three different biomass concentrations were used simultaneously. Although other fungal species in the literature failed at such a high concentration of fly ash, P. chrysogenum was able to tolerate it even at 10% concentration. The highest bio-removal yield was recorded as 100% at 0.5% fly ash concentration. Maximum bio-sorption yield was 95.27% after 24th hour. The evaluation results of fly ash bio-toxicity by D. magna showed that the no observed effect level (NOEL) was 0.2 mg/L and the low observed effect level (LOEL) was 0.5 mg/L. The element analysis, determined by ED-XRF, clarified that Ca, Si, Fe and S were the common elements in this ash. This is the first study in the literature where fly ash removal was carried out using P. chrysogenum for both bio-removal and bio-sorption and needs to be developed in the future. HIGHLIGHTS Fly ash removal by P. chrysogenum was investigated.; The fungus achieved the highest removal yields.; Highest pulp densities of fly ash were tolerated by the fungus in the literature.; Highest biosorption yield was determined in the literature as 95.27% after 24 hours.; Evaluation of fly ash bio-toxicity by D. magna was revealed for the first time.;

Keywords

• ash bio-removal
• bio-sorption
• bio-toxicity
• daphnia magna
• fly ash
• penicillium chrysogenum