Characteristics of the Bottom Ash in Municipal Solid Waste Incineration Ash

생활 폐기물 소각재 중 바닥재의 特性

  • 안지환 (한국지질자원연구원 자원활용연구부) ;
  • 한기천 (한국지질자원연구원 자원활용연구부) ;
  • 김형석 (한국지질자원연구원 자원활용연구부)
  • Published : 2001.08.01

Abstract

The main consistent materials and main elements of the bottom ash in municipal solid waste incineration ash according to particle size were investigated and the environmental hazards were considered by investigating the content of dioxin and heavy metals in bottom ash and the concentration of heavy metals in its leachate. The main materials of bottom ash are glasses, ceramics, scraps of iron. As the particle size increases, their percentage weight also increases and their percentage weight was over 70% in 4 mesh~25 mm particle size fraction. The main elements of bottom ash are CaO, $SiO_2$, $Fe_2$$O_3$,$ A1_2$$O_3$and the content of CaO decreases and the content of $SiO_2$increases as particle size increases. The heavy metals accumulate in small particle size fraction. The concentration of heavy metals in each leachate by domestic leaching test is almost similar. As the aging period is prolonged, pH of bottom ash lowers gradually and the leached concentration of Cu and Pb diminishes.