Flocculation and removal of the brown tide organism, Aureococcus anophagefferens (Chrysophyceae), using clays

	Flocculation and removal of the brown tide organism, Aureococcus anophagefferens (Chrysophyceae), using clays
	Yu, ZM; Sengco, MR ; Anderson, DM
	2004-03-01
发表期刊	JOURNAL OF APPLIED PHYCOLOGY
ISSN	0921-8971
卷号	16 期号:2 页码:101-110
文章类型	Article
摘要	Previous attempts to remove the brown tide organism, Aureococcus anophagefferens, through flocculation with clays have been unsuccessful, in spite of adopting concentrations and dispersal protocols that yielded excellent cell removal efficiency (RE>90%) with other species, so a study was planned to improve cell removal. Four modifications in clay preparation and dispersal were explored: 1) varying the salinity of the clay suspension; 2) mixing of the clay-cell suspension after clay addition; 3) varying of concentration of the initial clay stock; 4) pulsed loading of the clay slurry. The effect of salinity was dependent on the clay mineral type: phosphatic clay (IMC-P2) had a higher RE than kaolinite (H-DP) when seawater was used to disperse the clay, but H-DP removed cells more efficiently when suspended in distilled water prior to application. Mixing after dispersal approximately doubled RE for both clays compared to when the slurry was layered over the culture surface. Lowering the concentration of clay stock and pulsing the clay loading increased RE, regardless of mineral type. However, this increase was more apparent for clays dispersed in seawater than in distilled water. In general, application procedures that decrease the rate of self-aggregation among the clay particles and increase the collision frequency between clay particles and A. anophagefferens achieve higher cell removal efficiency. These empirical studies demonstrated that clays might be an important control option for the brown tide organism, given the proper attention to preparation, dispersal methods, environmental impacts, and the hydrodynamic properties of the system being treated. Implications for the treatment of brown tides in the field are discussed.; Previous attempts to remove the brown tide organism, Aureococcus anophagefferens, through flocculation with clays have been unsuccessful, in spite of adopting concentrations and dispersal protocols that yielded excellent cell removal efficiency (RE>90%) with other species, so a study was planned to improve cell removal. Four modifications in clay preparation and dispersal were explored: 1) varying the salinity of the clay suspension; 2) mixing of the clay-cell suspension after clay addition; 3) varying of concentration of the initial clay stock; 4) pulsed loading of the clay slurry. The effect of salinity was dependent on the clay mineral type: phosphatic clay (IMC-P2) had a higher RE than kaolinite (H-DP) when seawater was used to disperse the clay, but H-DP removed cells more efficiently when suspended in distilled water prior to application. Mixing after dispersal approximately doubled RE for both clays compared to when the slurry was layered over the culture surface. Lowering the concentration of clay stock and pulsing the clay loading increased RE, regardless of mineral type. However, this increase was more apparent for clays dispersed in seawater than in distilled water. In general, application procedures that decrease the rate of self-aggregation among the clay particles and increase the collision frequency between clay particles and A. anophagefferens achieve higher cell removal efficiency. These empirical studies demonstrated that clays might be an important control option for the brown tide organism, given the proper attention to preparation, dispersal methods, environmental impacts, and the hydrodynamic properties of the system being treated. Implications for the treatment of brown tides in the field are discussed.
关键词	Aureococcus Anophagefferens Brown Tide Clay Minerals Control Flocculation Habs Mitigation
学科领域	Biotechnology & Applied Microbiology ; Marine & Freshwater Biology
收录类别	SCI
语种	英语
WOS记录号	WOS:000224436600003
引用统计	被引频次：39[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/337002/2762
专题	海洋生态与环境科学重点实验室
作者单位	1.Woods Hole Oceanog Inst, Dept Biol, Woods Hole, MA 02543 USA 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Yu, ZM,Sengco, MR,Anderson, DM. Flocculation and removal of the brown tide organism, Aureococcus anophagefferens (Chrysophyceae), using clays[J]. JOURNAL OF APPLIED PHYCOLOGY,2004,16(2):101-110.
APA	Yu, ZM,Sengco, MR,&Anderson, DM.(2004).Flocculation and removal of the brown tide organism, Aureococcus anophagefferens (Chrysophyceae), using clays.JOURNAL OF APPLIED PHYCOLOGY,16(2),101-110.
MLA	Yu, ZM,et al."Flocculation and removal of the brown tide organism, Aureococcus anophagefferens (Chrysophyceae), using clays".JOURNAL OF APPLIED PHYCOLOGY 16.2(2004):101-110.

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