富营养化浅水湖泊胶体对藻毒素环境行为的影响及其机理研究

Climate warming and eutrophication are regarded as the important contributors to the occurrence of cyanobacteria blooms in aquatic ecosystems, leading to the increase releasing risk of microcystins. Colloids is considered to be an important factor to control microcystins transport and transformation processes in water. In view of the complexity of the colloidal structure in eutrophic lake water, the environmental behavior of microcystins affected by colloids is still not very clear. Therefore, we will: 1) starting research from the structure of colloids, evaluate the formation and destabilization of colloids and the underlying driving mechanism, 2) analyze the binding process between colloids and microcystins, 3) explore the dynamic distribution of microcystins in the water/colloids/multiple solid phases and the corresponding kinetic and thermodynamic laws, 4) explain the transformation and driving mechanism of microcystins due to colloids. Our results are expected to reveal the mechanism of the colloids influence on environmental behaviors of microcystins, which can provide fundamental scientific basis for the environmental management and remediation of microcystins pollution.

受水体富营养化和全球气候变暖的双重影响，产毒有害蓝藻水华生物量逐年增加，导致水体藻毒素产生和释放风险加大，藻毒素的环境行为及其生态安全已受到普遍关注。基于富营养浅水湖泊中胶体含量高、易与污染物结合迁移的特性，胶体作用下藻毒素环境行为与过程机制还不清楚，需要进一步深入研究。因此，本课题拟从胶体的结构稳定性研究出发，探索胶体与藻毒素结合/分离方式的动态过程，解析藻毒素在水相/胶体相/多固相界面分配以及动力学和热力学行为，阐明藻毒素在胶体作用下的形态转化过程及驱动机制。研究成果可望揭示胶体对藻毒素赋存分配、形态转化等环境行为的影响机制，为藻毒素污染环境管理和治理提供科学依据。

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