Fractal dimensions of flocs between clay particles and HAB organisms

doi:10.1007/s00343-011-0065-z

	Fractal dimensions of flocs between clay particles and HAB organisms
	Wang Hongliang 1,2; Yu Zhiming1 ; Cao Xihua1 ; Song Xiuxian1
	2011-05-01
发表期刊	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	0254-4059
卷号	29 期号:3 页码:656-663
文章类型	Article
摘要	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.; 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.
关键词	Harmful Algal Blooms Modified Clay Fractal Dimensions Heterosigma Akashiwo Alexandrium Tamarense Skeletonema Costatum
学科领域	Marine & Freshwater Biology ; Oceanography
DOI	10.1007/s00343-011-0065-z
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000292558100020
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/11671
专题	海洋生态与环境科学重点实验室
作者单位	1.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
推荐引用方式 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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