Treatability in the coagulation and sedimentation of turbidizing substances varies greatly depending on the rapid stirring strength GR. It is demonstrated that when PACl coagulant is used, the optimum treatability is achieved at GR values of 450 for turbidity and 1,000 sec−1 for STR, a newly introduced evaluation parameter. These values are much higher than the values typical of many water purification plants where the GR values are set at 100~200 sec−1. The remarkable improvement of coagulation and sedimentation treatment is found to be related to the formation of denser, smaller-diameter microfloc with increasing GR, and an increase in the incorporation of coagulant-derived aluminium in the microfloc and zeta-potential of the microfloc, among other flock properties.
Skip Nav Destination
Article navigation
Research Article|
December 01 2004
Novel technology for improving the treatability of turbidizing substances by coagulation and sedimentation Available to Purchase
K. Ebie;
K. Ebie
*
1Department of Civil Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido, 090-8507, Japan
Search for other works by this author on:
T. Kawaguchi;
T. Kawaguchi
**
1Department of Civil Engineering, Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido, 090-8507, Japan
Search for other works by this author on:
Water Supply (2004) 4 (5-6): 73–85.
Citation
K. Ebie, T. Kawaguchi, M. Asano; Novel technology for improving the treatability of turbidizing substances by coagulation and sedimentation. Water Supply 1 December 2004; 4 (5-6): 73–85. doi: https://doi.org/10.2166/ws.2004.0095
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
eBook
Pay-Per-View Access
$38.00