Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Operation Characteristics of the SBR Process with Electro-Flotation (EF) as Solids-liquid Separation Method

전해부상을 고액분리 방법으로 적용한 SBR 공정의 운전 특성

  • Park, Minjeong (Department of Environmental Engineering, Daegu University) ;
  • Choi, Younggyun (Department of Environmental Engineering, Daegu University)
  • Received : 2008.04.14
  • Accepted : 2008.04.30
  • Published : 2008.05.30
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Abstract

Electro-flotation (EF) was applied to a sequencing batch reactor process (SBR) in order to enhance solids-liquid separation. Solids-liquid separation was good enough in the SBR coupled with EF (EF-SBR) and it was possible to maintain the concentration of mixed liquor suspended solids (MLSS) high in the EF-SBR. Under moderate organic loading condition (COD loading rate: 6 g/day), control SBR (C-SBR) showed similar treatment efficiencies with the EF-SBR. Under high organic loading condition (COD loading rate: 9.6 g/day), the solids-liquid separation in the C-SBR was deteriorated due to proliferation of filamentous bulking organisms at high F/M ratio. However, the EF-SBR was operated stably and with the high MLSS concentration (above 4,000 mg/L) regardless of the organic loading conditions during overall operating period leading to the satisfactory effluent quality. Gas production rate of the electrodes was gradually decreased because of anodic corrosion and scale build-up at the surface of cathode. However it could be partially overcome by use of corrosion-proof electrode material (SUS-316 L) and by periodic current switching between the electrodes.

Keywords

Acknowledgement

Supported by : 대구대학교

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