Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Performance of Advanced Sewage Treatment Process with Waste Oyster Shell Media in Rural Area

폐굴껍질 담체를 이용한 마을하수고도처리공정의 성능평가

  • Lim, Bong-Su (Department of Environmental Engineering, Daejeon University) ;
  • Yang, Yan-Hao (Department of Environmental Engineering, Daejeon University)
  • 임봉수 (대전대학교 환경공학과) ;
  • 양연호 (대전대학교 환경공학과)
  • Received : 2005.08.01
  • Accepted : 2005.12.12
  • Published : 2006.01.30
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Abstract

This study was carried out to evaluate the performance of Modified Ludzsck Etinger (MLE) process with waste oyster shell media in aerobic tank. Influent flow was 36 L/d and the order of reactor was anoxic, aerobic and sedimentation tank and unit hydraulic retention time was 2 hr, 6 hr and 4 hr, respectively. Sludge recycling rate in sedimentation tank and internal recycling rate were 100%. Media fill rate in aerobic tank was 5%, 10% and 17% and fluid MLSS concentration in aerobic tank was 3000~4000 mg/L. Average TCOD removal rate was 91~93%, TBOD 92~96%, SS 95~96% and when media fill rate was 10% or more, in organic compound removal it could satisfy with wastewater discharge standard. Average total nitrogen removal rate was 70~76% and average total phosphorous removal rate was 58~65%. With media fill rate increasing, total phosphorous average removal rate also increased. For it was that released calcium ion from waste oyster shell reacted with soluble phosphorous. From these experiment results, the MLE process using waste oyster shell as media is a practical method for advanced sewage treatment in rural area.

Keywords

Acknowledgement

Supported by : 한국과학재단

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