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• W2353670805 abstract "Human remains accumulate various toxic and hazardous substances uptake from the environment during its life.Even after a human has been cremated,the heavy metals are still remained in the ashes.Therefore,the accumulation of a great amount of ashes has caused serious environmental issues in our country.The aim of this study was to investigate the effect of substrate concentration on the removal of heavy metals Zn,Cu,Pb and Cr from ashes with bioleaching method.Groups of microorganisms that would work as inoculum in this study were screened and isolated from municipal sludge by adding sulfur powder as their energy substance.Five bioleaching treatments,each containing ground ashes,inoculum,and SM culture mediums,were set up.Batch experiments were conducted over 15 days to optimize substrate(sulfur powder) concentrations of 0 g/L,2 g/L,4 g/L,6 g/L and 8 g/L,respectively for the bioleaching processes.Experimental results showed the effectiveness of bioleaching method for removing heavy metals from ashes.The pH and ORP that involved in the leaching effect of heavy metals in different bioleaching treatments was significantly affected by the concentration of added substrate.For the treatment free of sulfur powder,the removing rates of all measured heavy metals were less than 20 g/L due to a futile bioleaching process,while pH decreased from the same initial value of 5.0 to 1.29,0.93,0.70 and 0.54,respectively for the treatments as the addition of sulfur powder at a concentrate of 2 g/L,4 g/L,6 g/L and 8 g/L over bioleaching process of 15 days.The higher concentrate of added substrate meant lower pH and higher ORP.Accordingly the leaching effect of heavy metals from ashes was better.When bioleaching process was finished,the removing rates of Zn were 68.4%,82.6%,89.0% and 94.7%,respectively for four treatments.Similarly,the removing rates of Cu were 54.8%,80.6%,88.9% and 94.2%,of Pb were 25.1%,39.4%,42.2% and 43.5%,of Cr were 71.4%,93.2%,98.6% and 99.5%,respectively for the four different treatments.Correlation analysis results indicated that removing rate of heavy metals was significantly correlated with pH of bioleaching system.Furthermore,the inherent characteristic and chemical speciation of various heavy metals also related to their removing rates from ashes during bioleaching process.To optimizing substrate concentration,the sulfur utilizations that declined as the increase of added sulfur powder were determinated for different treatments.The result suggested that the concentrate of 4 g/L was suitable for removing heavy metals from ashes with bioleaching method in consideration of leaching effect and capital cost of a bioleaching operation" @default.
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• W2353670805 date "2012-01-01" @default.
• W2353670805 modified "2023-09-24" @default.
• W2353670805 title "Study on removal of heavy metals from the ashes with bioleaching method" @default.
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