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Fractal analysis of polyferric chloride-humic acid (PFC-HA) flocs in different topological spaces
Wang Yili; Lu Fia; Du Baiyu; Shi Baoyou; Wang Dongsheng
2009
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
Volume21Issue:1Pages:41-48
AbstractThe fractal dimensions in different topological spaces of polyferric chloride-humic acid (PFC-HA) flocs, formed in flocculating different kinds of humic acids (HA) water at different initial pH (9.0, 7.0, 5.0) and PFC dosages, were calculated by effective density-maximum diameter, image analysis, and N(2) absorption-desorption methods, respectively. The mass fractal dimensions (D(f)) of PFC-HA flocs were calculated by bi-logarithm relation of effective density with maximum diameter and Logan empirical equation. The D(f) value was more than 2.0 at initial pH of 7.0, which was 11% and 13% higher than those at pH 9.0 and 5.0, respecively, indicating the most compact flocs formed in flocculated HA water at initial pH of 7.0. The image analysis for those flocs indicates that after flocculating the HA water at initial pH greater than 7.0 with PFC flocculant, the fractal dimensions of D(2) (logA vs. logd(L)) and D(3) (logV(sphere) vs. logd(L)) of PFC-HA flocs decreased with the increase of PFC dosages, and PFC-HA flocs showed a gradually looser structure. At the optimum dosage of PFC, the D(2) (logA vs. logdL) values of the flocs show 14%-43% difference with their corresponding Elf, and they even had different tendency with the change of initial pH values. However, the D(2) values of the flocs formed at three different initial pH in HA solution had a same tendency with the corresponding D(f). Based on fractal Frenkel-Halsey-Hill (FHH) adsorption and desorption equations, the pore surface fractal dimensions (D(s)) for dried powders of PFC-HA floes formed in HA water with initial pH 9.0 and 7.0 were all close to 2.9421, and the D(s) values of flocs formed at initial pH 5.0 were less than 2.3746. It indicated that the pore surface fractal dimensions of PFC-HA flocs dried powder mainly show the irregularity from the mesopore-size distribution and marcopore-size distribution.
Department环境水质学国家重点实验室
KeywordPolyferric Chloride-humic Acid (Pfc-ha) Flocs Topological Spaces Fractal Dimensions Effective Density Image Analysis Pore Surface Fractal
WOS IDWOS:000262568800009
Citation statistics
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/21685
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Wang Yili,Lu Fia,Du Baiyu,et al. Fractal analysis of polyferric chloride-humic acid (PFC-HA) flocs in different topological spaces[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2009,21(1):41-48.
APA Wang Yili,Lu Fia,Du Baiyu,Shi Baoyou,&Wang Dongsheng.(2009).Fractal analysis of polyferric chloride-humic acid (PFC-HA) flocs in different topological spaces.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,21(1),41-48.
MLA Wang Yili,et al."Fractal analysis of polyferric chloride-humic acid (PFC-HA) flocs in different topological spaces".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 21.1(2009):41-48.
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