Effects of Coal Fly Ash on Composting Process of Household Garbage

음식쓰레기 퇴비화 과정에서 석탄회 첨가 효과

  • Seong, Soon-Hee (Dept. of Environmental Engineering, College of Engineering, Changwon National University) ;
  • Kim, Woo-Seong (Dept. of Environmental Engineering, College of Engineering, Changwon National University) ;
  • Seo, Jeoung-Yoon (Dept. of Environmental Engineering, College of Engineering, Changwon National University)
  • 성순희 (창원대학교 공과대학 환경공학과) ;
  • 김우성 (창원대학교 공과대학 환경공학과) ;
  • 서정윤 (창원대학교 공과대학 환경공학과)
  • Published : 1996.09.30

Abstract

Because of the high water content of the household garbage, it is difficult to compost it. Therefore, this study was conducted to investigate the possibility of using coal fly ash as humidity conditioner for the household garbage composting. The summarized results are as follows : 1. The maximum temperatures were $35^{\circ}C$ in spring, $47^{\circ}C$ in summer, and $43^{\circ}C$ in winter during the composting periods. 2. The mass was reduced to 70.5% after 60 days. The average volume reduced down to 74.7% after 60 days. 3. The seasonal variation of pH values showed a similar tendency and reached 8.5 after 60 days. 4. The water content was reduced at an early stage of composting and not much changed thereafter. It had 49.7% in spring, 33.9% in summer, and 56.5% in winter after 60 days. Ash contents were not much changed during the composting periods. 5. The contents of inorganic compounds were in the range of $0.06{\sim}4.03%$ $P_2O_5$, $0.01{\sim}2.87%$ CaO, $0.18{\sim}1.43%$ MgO, and $0.39{\sim}2.03%$ $K_2O$. Heavy metal contents were in the range of $ND{\sim}14.08$ Hg ${\mu}g/kg$, $ND{\sim}0.80$ Cd mg/kg, $4.99{\sim}28.95$ Cu mg/kg, $ND{\sim}242.62$ Cr mg/kg, $ND{\sim}20.24$ Pb mg/kg, and $ND{\sim}59.87$ Zn mg/kg.

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