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		<doi>10.1016/j.hal.2017.04.007</doi>
		<issn>1568-9883</issn>
		<citationkey>MirandaNPMPSSHLM:2017:EfCoCo</citationkey>
		<title>The efficiency of combined coagulant and ballast to remove harmful cyanobacterial blooms in a tropical shallow system</title>
		<year>2017</year>
		<typeofwork>journal article</typeofwork>
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		<author>Miranda, Miranda,</author>
		<author>Noyma, Natália,</author>
		<author>Pacheco, Felipe Siqueira,</author>
		<author>Magalhães, Leonardo de,</author>
		<author>Pinto, Ernani,</author>
		<author>Santos, Suzan,</author>
		<author>Soares, Maria Fernanda A.,</author>
		<author>Huszar, Vera L.,</author>
		<author>Lürling, Miquel,</author>
		<author>Marinho, Marcelo M.,</author>
		<group></group>
		<group></group>
		<group>COCST-COCST-INPE-MCTIC-GOV-BR</group>
		<affiliation>Universidade Federal de Juiz de Fora (UFJF)</affiliation>
		<affiliation>Universidade Federal do Rio de Janeiro (UFRJ)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Universidade Federal do Rio de Janeiro (UFRJ)</affiliation>
		<affiliation>Universidade de São Paulo (USP)</affiliation>
		<affiliation>Universidade Federal do Rio de Janeiro (UFRJ)</affiliation>
		<affiliation>Universidade Federal de Juiz de Fora (UFJF)</affiliation>
		<affiliation>Universidade Federal do Rio de Janeiro (UFRJ)</affiliation>
		<affiliation>Wageningen University</affiliation>
		<affiliation>Universidade Federal do Rio de Janeiro (UFRJ)</affiliation>
		<electronicmailaddress>marcela.miranda.ufjf@gmail.com</electronicmailaddress>
		<electronicmailaddress></electronicmailaddress>
		<electronicmailaddress>felipe.pacheco@inpe.br</electronicmailaddress>
		<journal>Harmful Algae</journal>
		<volume>65</volume>
		<pages>27-39</pages>
		<secondarymark>A2_ENGENHARIAS_I A2_BIODIVERSIDADE C_CIÊNCIAS_BIOLÓGICAS_I</secondarymark>
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		<keywords>Eutrophication control Cyanobacteria mitigation Microcystis Cylindrospermopsis Chitosan.</keywords>
		<abstract>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.</abstract>
		<area>CST</area>
		<language>en</language>
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