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

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	Flocculation and removal of the brown tide organism, Aureococcus anophagefferens (Chrysophyceae), using clays
	Yu, ZM; Sengco, MR ; Anderson, DM
刊名	JOURNAL OF APPLIED PHYCOLOGY
	2004-03-01
卷号	16 期号:2 页码:101-110
关键词	Aureococcus Anophagefferens Brown Tide Clay Minerals Control Flocculation Habs Mitigation
ISSN号	0921-8971
文献子类	Article
英文摘要	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.
学科主题	Biotechnology & Applied Microbiology ; Marine & Freshwater Biology
语种	英语
WOS记录号	WOS:000224436600003
公开日期	2010-12-22
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/2763]
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.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.