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 μm, M-II: 250-425 μm 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.

1. 서 론
2. 실험재료 및 방법
    2.1 가중응집제
    2.2 침전성 평가
    2.3 가중응집제 회수율 평가
    2.4 슬러지 침전모델
3. 결과 및 고찰
    3.1 가중응집제가 활성슬러지 침전특성에 미치는 영향
    3.2 침전모델을 이용한 가중응집슬러지의 침전특성 평가
    3.3 Hydro-cyclone(HC)을 이용한 가중응집제의 회수율 평가
4. 결 론
사 사
References

• 김용범(충남대학교 환경IT융합공학과) | Yongbum Kim (Department of Environmental IT Convergence Engineering, Chungnam National University)
• 양혜지(충남대학교 환경IT융합공학과) | Hyeji Yang (Department of Environmental IT Convergence Engineering, Chungnam National University)
• 최영균(충남대학교 환경IT융합공학과) | Younggun Choi (Department of Environmental IT Convergence Engineering, Chungnam National University) Corresponding author