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http://dx.doi.org/10.11001/jksww.2021.35.2.153

Application of activated carbon induced ballasted flocculation for improving activated sludge settleability  

Kim, Yongbum (Department of Environmental IT Convergence Engineering, Chungnam National University)
Yang, Hyeji (Department of Environmental IT Convergence Engineering, Chungnam National University)
Choi, Younggun (Department of Environmental IT Convergence Engineering, Chungnam National University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.35, no.2, 2021 , pp. 153-162 More about this Journal
Abstract
The effects of activated carbon originated Ballasted Flocculant (BF) on the settleability of activated sludge and the recovery of BF by Hydro-cyclone (HC) were analyzed experimentally. Two kinds of BF (M-I: 125-250 ㎛, M-II: 250-425 ㎛ in dia.) and three kinds of activated sludges with different SS concentration (2,300-7,100 mg/L) were applied for this study. With the dosage variation of BF from 0.14 to 1.3 g-BF/g-SS, we could obtain 24-31% improvement in SV30 (Sludge Volume after 30min sedimentation) for the lowest SS concentration sludge (2,300 mg/L). Whereas the SV30 improvement was much higher as 44-48% for the highest SS concentration sludge (7,100 mg/L). The settling characteristics of the sludge with BF followed Vesilind model the best among three models (Vesilind, Takacs and Cho model). HC could effectively separate BF with the separation efficiency of 70-90% and over 95% separation efficiency could be obtained when the HC was applied twice.
Keywords
Ballasted flocculant; Recovery efficiency; Sludge settling; Sedimentation model; Sludge induced activated carbon;
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