We monitored the changes in concentrations, zeta potentials, sizes and capillary suction times of the solids flocs in the clarified water from eight floc blanket clarifiers of PingTsan Water Works of Taiwan Water Supply Company with low (<10 NTU) and high (>100 NTU) turbidity raw water. For the former, one-stage coagulation-sedimentation treatment was adopted which yielded a rather unstable blanket. Complete washout was noticeable when the PACl dosage was insufficient. On the treatment of high-turbidity raw water, on the other hand, the Works adopted the combined treatment process, that is, the raw water was first coagulated and settled in a pre-sedimentation tank, afterwards, its effluent was coagulated again and clarified in the clarifiers. The resulting flocs could form a networked blanket that was relatively stable to the shock load in raw water turbidity.
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Research Article|
January 01 2003
Observations of blanket characteristics in full-scale floc blanket clarifiers
L.C. Chen;
L.C. Chen
*Chemical Engineering Department, National Taiwan University, Taipei 106, Chinese Taiwan
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S.S. Sung;
S.S. Sung
*Chemical Engineering Department, National Taiwan University, Taipei 106, Chinese Taiwan
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W.W. Lin;
W.W. Lin
*Chemical Engineering Department, National Taiwan University, Taipei 106, Chinese Taiwan
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D.J. Lee;
D.J. Lee
*Chemical Engineering Department, National Taiwan University, Taipei 106, Chinese Taiwan
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C. Huang;
C. Huang
**Institute of Environmental Engineering, National Chiao Tung University, Hsinchu, 300, Chinese Taiwan
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R.S. Juang;
R.S. Juang
***Department of Chemical Engineering, Yuan Ze University, Chung-Li 320, Chinese Taiwan
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H.-L. Chang
H.-L. Chang
****Water Quality Section, The 2nd District, Taiwan Water Supply Corporation, Taoyuan, Chinese Taiwan
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Water Sci Technol (2003) 47 (1): 197–204.
Citation
L.C. Chen, S.S. Sung, W.W. Lin, D.J. Lee, C. Huang, R.S. Juang, H.-L. Chang; Observations of blanket characteristics in full-scale floc blanket clarifiers. Water Sci Technol 1 January 2003; 47 (1): 197–204. doi: https://doi.org/10.2166/wst.2003.0053
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