바이오매스 회분 혼합에 따른 토양 내 중금속 (Ni, Cr) 안정화
Stabilization of Heavy Metal (Ni, Cr) in Soil Amended with Biomass Ash
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초록
This study investigated the potential use and the effectiveness of biomass ashes for the stabilization of heavy metals in soil through a series ofexperiments. The ashes used for the experiments were obtained from the gasification of biomass including miscanthus and woodchips. The amounts ofnickel and chromium released from the soil and ash mixture were analyzed. Chemical analysis showed that the ash contained unburned carbon as wellas silica and alkali metals. Miscanthus ashes have C (83.400 %) > Si (9.040 %) > K (3.180 %) > Ca (1.800 %), and woodchip ashes have C (93.800 %)> Ca (2.220 %) > Fe (1.370 %) > K (1.200 %). KSLT and TCLP test results implied that the heavy metal concentrations were below the environmentalstandards and would not impose the risks. The results also showed that Ni releases were more limited as more ashes were mixed with the soil due to theincreases in exchangeable, carbonate, and oxide nikels. Both miscanthus and woodchip ahses were effective in stabilizing nickel and chromium throughmixing with the soil. It could be seen that ashes produced from biomass gasification can be used to stabilize the heavy metals in soils.
Abstract
This study investigated the potential use and the effectiveness of biomass ashes for the stabilization of heavy metals in soil through a series ofexperiments. The ashes used for the experiments were obtained from the gasification of biomass including miscanthus and woodchips. The amounts ofnickel and chromium released from the soil and ash mixture were analyzed. Chemical analysis showed that the ash contained unburned carbon as wellas silica and alkali metals. Miscanthus ashes have C (83.400 %) > Si (9.040 %) > K (3.180 %) > Ca (1.800 %), and woodchip ashes have C (93.800 %)> Ca (2.220 %) > Fe (1.370 %) > K (1.200 %). KSLT and TCLP test results implied that the heavy metal concentrations were below the environmentalstandards and would not impose the risks. The results also showed that Ni releases were more limited as more ashes were mixed with the soil due to theincreases in exchangeable, carbonate, and oxide nikels. Both miscanthus and woodchip ahses were effective in stabilizing nickel and chromium throughmixing with the soil. It could be seen that ashes produced from biomass gasification can be used to stabilize the heavy metals in soils.
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