화력발전소 석탄 바닥재의 재활용을 위한 물리화학적 특성분석 및 환경성 평가 (Physico-chemical Characteristics and Environmental Assessment of Coal Bottom Ash from Coal-fired Power Plant for Beneficial Use)

서지정보

· 발행기관 : 한국폐기물자원순환학회
· 수록지 정보 : 한국폐기물자원순환학회지 / 26권 / 8호 / 680 ~ 688페이지
· 저자명 : 장용철, 이성우, 임종명

초록

The proper management of coal-fired bottom ash generated from coal power plants (often called "coal bottom ash") has been raised as an issue. The major management practice most commonly employed for the ash is disposal in landfills (ash pond) near ocean. The presence of large coarse and fine materials in the ash has prompted the desire to beneficially use it in an application such as fill materials. This objective, coupled with costs associated with ash pond disposal, provides incentive to explore beneficial use options. Prior to reuse application, the physical and chemical properties of the ash must be assessed with regard to the potential environmental impacts. A total of nine bottom ash samples were collected from an active ash pond and pretreated bottom ash piles in a coal-fired power plant. Each sample was tested for physical (e.g., particle size distribution, permeability) and chemical characteristics (e.g., pH, salinity, conductance, loss of ignition, unburned carbon content, oxides, total metal analyses). Three leaching tests such as Korea standard leaching test (KSLT), US toxicity characteristics leaching procedure (TCLP), and US synthetic precipitation leaching procedure (SPLP) were also performed to determine leachability of pollutants, especially metals. The concentrations of chemicals detected in the extracts were compared to appropriate standards, if possible, to assess potential leaching risks to the surrounding area. For the total metal analysis, most of the samples contained several ions such as Na, K, Ca, Mg, Al in relatively large quantities and trace chemical constituents such as B, Ba, Ni, Cr, Cu, and Zn. In the leaching experiments, three elements (Al, B, Ba) were commonly detected above their respective detection limits in a number of samples. The results of the leaching study indicate that the pollutants in the coal bottom ash were not of a major concern in terms of leaching risk to surface water and groundwater under reuse scenarios. However, care must be exercised in extending these results to field conditions because the results presented in this study are based on limited laboratory settings and a limited time frame.

영어초록

The proper management of coal-fired bottom ash generated from coal power plants (often called "coal bottom ash") has been raised as an issue. The major management practice most commonly employed for the ash is disposal in landfills (ash pond) near ocean. The presence of large coarse and fine materials in the ash has prompted the desire to beneficially use it in an application such as fill materials. This objective, coupled with costs associated with ash pond disposal, provides incentive to explore beneficial use options. Prior to reuse application, the physical and chemical properties of the ash must be assessed with regard to the potential environmental impacts. A total of nine bottom ash samples were collected from an active ash pond and pretreated bottom ash piles in a coal-fired power plant. Each sample was tested for physical (e.g., particle size distribution, permeability) and chemical characteristics (e.g., pH, salinity, conductance, loss of ignition, unburned carbon content, oxides, total metal analyses). Three leaching tests such as Korea standard leaching test (KSLT), US toxicity characteristics leaching procedure (TCLP), and US synthetic precipitation leaching procedure (SPLP) were also performed to determine leachability of pollutants, especially metals. The concentrations of chemicals detected in the extracts were compared to appropriate standards, if possible, to assess potential leaching risks to the surrounding area. For the total metal analysis, most of the samples contained several ions such as Na, K, Ca, Mg, Al in relatively large quantities and trace chemical constituents such as B, Ba, Ni, Cr, Cu, and Zn. In the leaching experiments, three elements (Al, B, Ba) were commonly detected above their respective detection limits in a number of samples. The results of the leaching study indicate that the pollutants in the coal bottom ash were not of a major concern in terms of leaching risk to surface water and groundwater under reuse scenarios. However, care must be exercised in extending these results to field conditions because the results presented in this study are based on limited laboratory settings and a limited time frame.

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