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The behavior of metal ions’ leaching and precipitated mineral phases of metal-rich fly ash (FA) was examined in order to evaluate
microbial impacts on carbon sequestration and metal immobilization. The leaching solutions consisted of aerobic deionized
water (DW) and artificial eutrophic water (AEW) that was anaerobic, organic- and mineral-rich, and higher salinity as is typical
of bottom water in eutrophic algae ponds. The Fe- and Ca-rich FAs were predominantly composed of quartz, mullite, portlandite,
calcite, hannebachite, maghemite, and hematite. After 86 days, only Fe and Ca contents exhibited a decrease in leaching solutions
while other major and trace elements showed increasing or steady trends in preference to the type of FA and leaching solution.
Ca-rich FA showed strong carbon sequestration efficiency ranging up to 32.3 g CO2/kg FA after 86 days, corresponding to almost 65% of biotic carbon sequestration potential under some conditions. Variations
in the properties of FAs such as chemical compositions, mineral constituents as well as the type of leaching solution impacted
CO2 capture. Even though the relative amount of calcite increased sixfold in the AEW and the relative amount of mineral phase
reached 37.3 wt% using Ca-rich FA for 86 days, chemical sequestration did not accomplish simultaneous precipitation and sequestration
of several heavy metals. 相似文献