The finer fraction of waste was heated at the various temperature ranging from 60oC to 500oC. Thermal treatment of waste was carried out at 60oC, 105oC, 200oC, 300oC, 400oC, and 500oC by keeping waste for 3 hours in muffle furnace and after heating, single batch leaching was performed and metals were analyzed in the water extract.
From the analysis, it was observed that concentration of heavy metals was increased when the material was heated from 60oC to 300oC and after that, it falls down and least concentration of metals was observed from leachate corresponds to the thermal treatment of soil at 500oC.
For some metals leaching studies showed more substantial binding after thermal treatment.Operating conditions during thermal treatments such as temperature and residence time are of major importance to explain the leaching behaviour of heavy metals. The release of these metals during leaching with water can be related to the presence organic material in bottom ash. Fulvic and humic acids are known to form mobile organo-metallic complexes with cations of Cu, Pb, Ni, and Zn., so that removal or destruction of organic substances allows for decreasing of the leaching of toxic cations. Additional thermal treatment is applied to oxidise the organic matter. This treatment has been reported to be an effective way to reduce heavy metal leaching of many metals. For additional information consult https://www.citeseerx.ist.psu.edu . Waste management and Research 1 - 7
Thanks for the prompt and helpful reply. Can you please share the article. I am not able to access the link.
Dear Mohit!
I suggest that you specify the metals content of your fine fraction by using sequential extraction procedure. This method could show you the content of metals in each fraction (exchangeable, bound to carbonates or to organic matter etc.) and then you can understand the reason for your results.
Regards
Yahya
Some metals are volatile, so the loss of the considered metal concentration in the temperature applied has to be known for each case.
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