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Critical assessment of chitosan as coagulant to remove cyanobacteria

机译：对脱乙酰壳多糖作为凝结剂去除蓝细菌的关键评估

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摘要

Removal of cyanobacteria from the water column using a coagulant and a ballast compound is a promising technique to mitigate nuisance. As coagulant the organic, biodegradable polymer chitosan has been promoted. Results in this study show that elevated pH, as may be common during cyanobacterial blooms, as well as high alkalinity may hamper the coagulation of chitosan and thus impair its ability to effectively remove positively buoyant cyanobacteria from the water column. The underlying mechanism is likely a shielding of the protonated groups by anions. Inasmuch as there are many chitosan formulations, thorough testing of each chitosan prior to its application is essential. Results obtained in glass tubes were similar to those from standard jar tests demonstrating that glass tube tests can be used for testing effects of coagulants and ballasts in cyanobacteria removal whilst allowing far more replicates. There was no relation between zeta potential and precipitated cyanobacteria. Given the well-known antibacterial activity of chitosan and recent findings of anti-cyanobacterial effects, pre-application tests are needed to decipher if chitosan may cause cell leakage of cyanotoxins. Efficiency- and side-effect testing are crucial for water managers to determine if the selected approach can be used in tailor-made interventions to control cyanobacterial blooms and to mitigate eutrophication. (C) 2017 Elsevier B.V. All rights reserved.
机译：使用凝结剂和压舱剂从水柱中去除蓝细菌是减轻干扰的有前途的技术。作为凝结剂，已经促进了有机的，可生物降解的聚合物壳聚糖。这项研究的结果表明，升高的pH值（可能是蓝藻水华期间常见的现象）以及高碱度可能会阻碍壳聚糖的凝结，从而削弱其从水柱中有效去除正浮力蓝藻细菌的能力。潜在的机制可能是阴离子对质子化基团的屏蔽。由于壳聚糖的配方很多，因此在使用前必须对每种壳聚糖进行彻底的测试。在玻璃管中获得的结果与从标准广口瓶测试中获得的结果相似，这表明玻璃管测试可用于测试凝结剂和压载物在去除蓝细菌中的作用，同时允许进行更多的重复。 ζ电位与沉淀的蓝细菌之间没有关系。考虑到壳聚糖的众所周知的抗菌活性和抗氰细菌作用的最新发现，需要进行应用前测试才能确定壳聚糖是否可能导致氰毒素的细胞泄漏。效率和副作用测试对于水管理者确定所选择的方法是否可用于量身定制的干预措施以控制蓝细菌繁殖并减轻富营养化至关重要。 （C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Harmful Algae》 |2017年第6期|1-12|共12页
  • 作者

    Lurling Miquel; Noyma Natalia Pessoa; de Magalhaes Leonardo; Miranda Marcela; Mucci Maira; van Oosterhout Frank; Huszar Vera L. M.; Marinho Marcelo Manzi;

  • 作者单位

    Wageningen Univ, Dept Environm Sci, Aquat Ecol & Water Qual Management Grp, POB 47, NL-6700 AA Wageningen, Netherlands|Netherlands Inst Ecol NIOO KNAW, Dept Aquat Ecol, POB 50, NL-6700 AB Wageningen, Netherlands;

    Univ Estado Rio De Janeiro, Dept Plant Biol, Lab Ecol & Physiol Phytoplankton, Rua Sao Francisco Xavier 524 PHLC Sala 511a, BR-20550900 Rio De Janeiro, Brazil;

    Univ Estado Rio De Janeiro, Dept Plant Biol, Lab Ecol & Physiol Phytoplankton, Rua Sao Francisco Xavier 524 PHLC Sala 511a, BR-20550900 Rio De Janeiro, Brazil;

    Univ Estado Rio De Janeiro, Dept Plant Biol, Lab Ecol & Physiol Phytoplankton, Rua Sao Francisco Xavier 524 PHLC Sala 511a, BR-20550900 Rio De Janeiro, Brazil;

    Wageningen Univ, Dept Environm Sci, Aquat Ecol & Water Qual Management Grp, POB 47, NL-6700 AA Wageningen, Netherlands;

    Wageningen Univ, Dept Environm Sci, Aquat Ecol & Water Qual Management Grp, POB 47, NL-6700 AA Wageningen, Netherlands;

    Univ Fed Rio de Janeiro, Museu Nacl, BR-20940040 Rio De Janeiro, Brazil;

    Univ Estado Rio De Janeiro, Dept Plant Biol, Lab Ecol & Physiol Phytoplankton, Rua Sao Francisco Xavier 524 PHLC Sala 511a, BR-20550900 Rio De Janeiro, Brazil;

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  • 正文语种 eng
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  • 关键词

    Cyanobacterial blooms; Eutrophication; Flock and sink; Mitigation; Nuisance control;

    机译：蓝藻水华;富营养化;群落;缓解;污染控制;

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