期刊
HARMFUL ALGAE
卷 65, 期 -, 页码 27-39出版社
ELSEVIER
DOI: 10.1016/j.hal.2017.04.007
关键词
Eutrophication control; Cyanobacteria mitigation; Microcystis; Cylindrospermopsis; Chitosan
资金
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) through a Science without Borders grant [SWB/CNPq 400408/2014-7]
- CNPq Project [473141/2013-2]
- Fundacao de Apoio a Pesquisa do Estado do Rio de Janeiro [FAPERJ - 111.267/2014]
- Fundacao de Apoio a Pesquisa do Estado de Sao Paulo [FAPESP 2014/50420-9, 2014/06556-3]
- CNPq
- CAPES (Brazil)/NUFFIC (The Netherlands) [045/12]
We tested the hypothesis that a combination of coagulant and ballast could be efficient for removal of positively buoyant harmful cyanobacteria in shallow tropical waterbodies, and will not promote the release of cyanotoxins. This laboratory study examined the efficacy of coagulants [polyaluminium chloride (PAC) and chitosan (made of shrimp shells)] alone, and combined with ballast (lanthanum modified bentonite, red soil or gravel) to remove the natural populations of cyanobacteria collected from a shallow eutrophic urban reservoir with alternating blooms of Cylindrospermopsis and Microcystis. PAC combined with ballast was effective in settling blooms dominated by Microcystis or Cylindrospermopsis. Contrary to our expectation, chitosan combined with ballast was only effective in settling Cylindrospermopsis-dominated blooms at low pH, whereas at pH >= 8 no effective flocculation and settling could be evoked. Chitosan also had a detrimental effect on Cylindrospermopsis causing the release of saxitoxins. In contrast, no detrimental effect on Microcystis was observed and all coagulant-ballast treatments were effective in not only settling the Microcystis dominated bloom, but also lowering dissolved microcystin concentrations. Our data show that the best procedure for biomass reduction also depends on the dominant species. (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据