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Fractal dimensions of flocs between clay particles and HAB organisms
Wang Hongliang1,2; Yu Zhiming1; Cao Xihua1; Song Xiuxian1
2011-05-01
Source PublicationCHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN0254-4059
Volume29Issue:3Pages:656-663
SubtypeArticle
AbstractThe impact of harmful algal blooms (HABs) on public health and related economics have been increasing in many coastal regions of the world. Sedimentation of algal cells through flocculation with clay particles is a promising strategy for controlling HABs. Previous studies found that removal efficiency (RE) was influenced by many factors, including clay type and concentration, algal growth stage, and physiological aspects of HAB cells. To estimate the effect of morphological characteristics of the aggregates on HAB cell removal, fractal dimensions were measured and the RE of three species of HAB organism, Heterosigma akashiwo, Alexandrium tamarense, and Skeletonema costatum, by original clay and modified clay, was determined. For all HAB species, the modified clay had a higher RE than original clay. For the original clay, the two-dimensional fractal dimension (D-2) was 1.92 and three-dimensional fractal dimension (D-3) 2.81, while for the modified clay, D-2 was 1.84 and D-3 was 2.50. The addition of polyaluminum chloride (PACl) lead to a decrease of the repulsive barrier between clay particles, and resulted in lower D-2 and D-3. Due to the decrease of D-3, and the increase of the effective sticking coefficient, the flocculation rate between modified clay particles and HAB organisms increased, and thus resulted in a high RE. The fractal dimensions of flocs differed in HAB species with different cell morphologies. For example, Alexandrium tamarense cells are ellipsoidal, and the D-3 and D-2 of flocs were the highest, while for Skeletonema costatum, which has filamentous cells, the D-3 and D-2 of flocs were the lowest.; The impact of harmful algal blooms (HABs) on public health and related economics have been increasing in many coastal regions of the world. Sedimentation of algal cells through flocculation with clay particles is a promising strategy for controlling HABs. Previous studies found that removal efficiency (RE) was influenced by many factors, including clay type and concentration, algal growth stage, and physiological aspects of HAB cells. To estimate the effect of morphological characteristics of the aggregates on HAB cell removal, fractal dimensions were measured and the RE of three species of HAB organism, Heterosigma akashiwo, Alexandrium tamarense, and Skeletonema costatum, by original clay and modified clay, was determined. For all HAB species, the modified clay had a higher RE than original clay. For the original clay, the two-dimensional fractal dimension (D(2)) was 1.92 and three-dimensional fractal dimension (D(3)) 2.81, while for the modified clay, D(2) was 1.84 and D(3) was 2.50. The addition of polyaluminum chloride (PACl) lead to a decrease of the repulsive barrier between clay particles, and resulted in lower D(2) and D(3). Due to the decrease of D(3), and the increase of the effective sticking coefficient, the flocculation rate between modified clay particles and HAB organisms increased, and thus resulted in a high RE. The fractal dimensions of flocs differed in HAB species with different cell morphologies. For example, Alexandrium tamarense cells are ellipsoidal, and the D(3) and D(2) of flocs were the highest, while for Skeletonema costatum, which has filamentous cells, the D(3) and D(2) of flocs were the lowest.
KeywordHarmful Algal Blooms Modified Clay Fractal Dimensions Heterosigma Akashiwo Alexandrium Tamarense Skeletonema Costatum
Subject AreaMarine & Freshwater Biology ; Oceanography
DOI10.1007/s00343-011-0065-z
URL查看原文
Indexed BySCI
Language英语
WOS IDWOS:000292558100020
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/11671
Collection海洋生态与环境科学重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang Hongliang,Yu Zhiming,Cao Xihua,et al. Fractal dimensions of flocs between clay particles and HAB organisms[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2011,29(3):656-663.
APA Wang Hongliang,Yu Zhiming,Cao Xihua,&Song Xiuxian.(2011).Fractal dimensions of flocs between clay particles and HAB organisms.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,29(3),656-663.
MLA Wang Hongliang,et al."Fractal dimensions of flocs between clay particles and HAB organisms".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 29.3(2011):656-663.
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