Fractal dimensions of flocs between clay particles and HAB organisms

doi:10.1007/s00343-011-0065-z

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	Fractal dimensions of flocs between clay particles and HAB organisms
	Wang Hongliang 1,2; Yu Zhiming1 ; Cao Xihua1 ; Song Xiuxian1
刊名	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
	2011-05-01
卷号	29 期号:3 页码:656-663
关键词	Harmful Algal Blooms Modified Clay Fractal Dimensions Heterosigma Akashiwo Alexandrium Tamarense Skeletonema Costatum
ISSN号	0254-4059
DOI	10.1007/s00343-011-0065-z
文献子类	Article
英文摘要	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.
学科主题	Marine & Freshwater Biology ; Oceanography
URL标识	查看原文
语种	英语
WOS记录号	WOS:000292558100020
公开日期	2012-07-03
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/11672]
专题	海洋研究所_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.