Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Feasibility of Coal Combustion Ash on Acidity Regulation for Agricultural Use

석탄연소재의 산도조절을 통한 농업적 활용 가능성

  • Oh, Sejin (Yeongheung Division, Korea South-East Power Co.) ;
  • Kang, Min Woo (Department of Environmental Engineering, Yonsei University) ;
  • Kim, Sung-Chul (Chungnam National University, Bio-Environmental Chemistry) ;
  • Lee, Sang Soo (Department of Environmental Engineering, Yonsei University)
  • Received : 2019.01.16
  • Accepted : 2019.03.22
  • Published : 2019.03.31
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Abstract

BACKGROUND: Coal ashes generated from thermal power plants have been known as beneficial materials for agricultural use because of their nutrient elements. However, there is limitation to recycle them due to their alkalinity. The objective of this study was to evaluate the effectiveness or safety of the coal ashes for their heavy metals on agricultural recycling when adjusted to pH of 5 with sulfuric acid. METHODS AND RESULTS: Concentration of hydrogen which is needed to adjust pH of coal ash was estimated by using a buffering curve and then the amount of sulfuric acid was changed by the estimation before incubation. Each of fly ash (FA) and bottom ash (BA) was collected from both thermal plants of Yeongdong (YD) and Yeongheung (YH). The pH values of coal ashes increased to 4.76 (from 4.34) after incubation with sulfuric acid for 56 days, closer to the targeted pH. Coal ashes also increased the contents of available phosphorus by 2-fold (165 mg/kg) and 11-fold (1,137 mg/kg) for YDBA and YDFA, respectively, compared to the control. CONCLUSION: The utilization of coal ash with its acidity regulation would be very beneficial to agriculture sector and further suggest promising environmental safety against heavy metals.

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References

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