Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Dewatering and Settling Characteristics of Digested Sludge from the Anaerobic Sequencing Batch Reactor for Treatment of Nightsoil

혐기성 연속회분식 공정을 이용한 분뇨처리시 소화슬러지의 침강 및 탈수특성

  • Lee, Jun-Geol (Dept. of Environment Management, Andong Junior College) ;
  • Jang, Duk (Dept. of Environmental Engineering, Kon-Kuk University) ;
  • Heo, Jun-Mu (Dept. of Environmental Engineering, Kon-Kuk University) ;
  • Son, Boo-Soon (Dept. of Environmental Health Science, Soonchunhyang University) ;
  • Jang, Bong-Ki (Dept. of Environmental Health Science, Soonchunhyang University) ;
  • Park, Jong-An (Dept. of Environmental Health Science, Soonchunhyang University)
  • 이준걸 (안동전문대학 환경관리과) ;
  • 장덕 (건국대학교 환경공학과) ;
  • 허준무 (건국대학교 환경공학과) ;
  • 손부순 (순천향대학교 환경보건학과) ;
  • 장봉기 (순천향대학교 환경보건학과) ;
  • 박종안 (순천향대학교 환경보건학과)
  • Published : 1998.12.01
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Abstract

Laboratory study was conducted to provide basic data for operating anaerobic sequencing batch reactor(ASBR) process for treatment of nightsoil. The experiments were concerned with digestion characteristics, settleabiltity and dewaterability of digested sludge in ASBR system. Completely-mixed dally-fed control reactor without solid-liquid separation step was also operated to evaluate the baseline performance since the nature of nightsoil was changed with time. In all case, gas production from the ASBR shows 1.3 to 1.44 times higher than that from control, in spite of almost similar trend in organics removal. During thickening period, remarkable decrease in surface settling velocity was observed at the ASBRs compared with the control. In case of the ASBR run, flotation of mixed digested sludge was not occurred. Also, ultimate thickened volume of ASBRs increased 1.2~1.5 times compared with control. Dewaterability of digested sludge without conditioning decreased when the completely-mixed daily-fed reactor for ASBR run was converted to the ASBR. However, improvement of dewaterability of digested sludge from the ASBRs was observed as a result of addition of FeCl$_3$ to digested sludge for conditioning.

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