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Operation Characteristics of the SBR Process with Electro-Flotation (EF) as Solids-liquid Separation Method  

Park, Minjeong (Department of Environmental Engineering, Daegu University)
Choi, Younggyun (Department of Environmental Engineering, Daegu University)
Publication Information
Journal of Korean Society on Water Environment / v.24, no.3, 2008 , pp. 340-344 More about this Journal
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
Electro-flotation (EF); Organic loading; Sequencing batch reactor (SBR); Solids-liquid separation;
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Times Cited By KSCI : 2  (Citation Analysis)
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