Influence of zeta potential on the flocculation of cyanobacteria cells using chitosan modified soil

查看全文 作　　者：Liang [1]Li;Honggang [1]Zhang;Gang [1]Pan

机构地区：[1]Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences

出　　处：《Journal of Environmental Sciences》索引2015年第27卷第2期,共7页

基　　金：supported by the National Basic Research Program (973) of China;the application of nano-material and nano-technology in detecting and treating water pollutants (No. 2010CB933600);the Science Promotion Program of Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (No. YSW2013B05) 摘　　要：Using chitosan modified soil to flocculate and sediment algal cells has been considered as a promising strategy to combat cyanobacteria blooms in natural waters. However, the flocculation efficiency often varies with algal cells with different zeta potential(ZP) attributed to different growth phases or water conditions. This article investigated the relationship between ZP of Microcystis aeruginosa and its influence to the flocculation efficiency using chitosan modified soil. Results suggested that the optimal removal efficiency was obtained when the ZP was between- 20.7 and- 6.7 m V with a removal efficiency of more than 80% in 30 min and large floc size of > 350 μm. When the algal cells were more negatively charged than- 20.7 m V, the effect of chitosan modified soil was depressed(< 60%) due to the insufficient charge density of chitosan to neutralize and destabilize the algal suspension. When the algal cells were less negative than- 6.7 m V or even positively charged, a small floc size(< 120 μm) was formed, which may be difficult to sink under natural water conditions. Therefore, manipulation of ZP provided a viable tool to improve the flocculation efficiency of chitosan modified soil and an important guidance for practical engineering of cyanobacteria bloom control. 关键词：絮凝效率藻细胞壳聚糖 ZETA电位改性 ZETA电位脱乙酰壳多糖自然水域

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Influence of zeta potential on the flocculation of cyanobacteria cells using chitosan modified soil

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