Journal of Zhejiang University SCIENCE
(ISSN 1009-3095, Monthly)
2005 Vol. 6B No. 10 p.1038-1044
Flocculation control study based on fractal theory
CHANG Ying†1, LIU Qian-jun2, ZHANG Jin-song3
(1Guangzhou Water Supply Co., Guangzhou 510160, China)
(2Zhejiang Urban and Rural Planning Design Institute, Hangzhou 310007, China)
(3Shenzhen Water (Group) Co., Limited, Shenzhen 518031, China)
†E-mail: acerine@sohu.com
Received Feb. 20, 2005; revision accepted June 20, 2005
Abstract: A study on flocculation control based on fractal theory was carried out. Optimization test of chemical coagulant dosage confirmed that the fractal dimension could reflect the flocculation degree and settling characteristics of aggregates and the good correlation with the turbidity of settled effluent. So that the fractal dimension can be used as the major parameter for flocculation system control and achieve self-acting adjustment of chemical coagulant dosage. The fractal dimension flocculation control system was used for further study carried out on the effects of various flocculation parameters, among which are the dependency relationship among aggregates fractal dimension, chemical coagulant dosage, and turbidity of settled effluent under the conditions of variable water quality and quantity. And basic experimental data were obtained for establishing the chemical coagulant dosage control model mainly based on aggregates fractal dimension.
Key words: Aggregates, Flocculation control, Fractal dimension, Image analysis, Turbidity
doi:10.1631/jzus.2005.B1038 CLC number: TU991.22