Giannuzzi Leda, Bacciadone Julián, Salerno Graciela L
Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA-CONICET), La Plata 1900, Argentina.
Fundación Para Investigaciones Biológicas Aplicadas (FIBA), Vieytes 3103, Mar del Plata 7600, Argentina.
Microorganisms. 2022 Oct 18;10(10):2052. doi: 10.3390/microorganisms10102052.
The increase in cyanobacterial blooms linked to climate change and the eutrophication of water bodies is a global concern. The harmful cyanobacterium is one of the most common bloom-forming species whose removal from fresh water and, in particular, from that used for water treatment processes, remains a crucial goal. Different biodegradable and environmentally friendly coagulants/flocculants have been assayed, with chitosan showing a very good performance. However, chitosan in its original form is of limited applicability since it is only soluble in acid solution. The objective of this work was therefore to test the coagulant/flocculant capacity of trimethylchitosan (TMC), a chitosan derivative produced from residues of the fishing industry. TMC has a constitutively net positive charge enabling it to remain in solution regardless of the pH. Results show that even at alkaline pHs, common during cyanobacterial blooms, TMC is effective in removing buoyant cyanobacteria from the water column, both in test tube and Jar-Test experiments. Cell integrity was confirmed by fluorescent stain and electron microscopy. Our findings lead us to conclude that the use of TMC to remove bloom cells early in the treatment of drinking water is both feasible and promising.
与气候变化和水体富营养化相关的蓝藻水华增加是一个全球关注的问题。有害蓝藻是最常见的形成水华的物种之一，从淡水中去除，特别是从用于水处理过程的水中去除，仍然是一个关键目标。人们已经对不同的可生物降解且环保的混凝剂/絮凝剂进行了试验，壳聚糖表现出非常好的性能。然而，原始形式的壳聚糖适用性有限，因为它仅可溶于酸性溶液。因此，这项工作的目的是测试三甲基壳聚糖（TMC）的混凝剂/絮凝剂能力，TMC是一种由渔业残留物生产的壳聚糖衍生物。TMC具有固有净正电荷，使其无论pH值如何都能保持在溶液中。结果表明，即使在蓝藻水华期间常见的碱性pH值下，TMC在试管和烧杯试验中都能有效地从水柱中去除漂浮的蓝藻。通过荧光染色和电子显微镜确认了细胞完整性。我们的研究结果使我们得出结论，在饮用水处理早期使用TMC去除水华细胞既可行又有前景。
