Microplastic hetero-aggregates are stable forms of microplastics in the aqueous environment. However, when disinfecting water containing microplastic hetero-aggregates, the response of them in water to different oxidizing agents and the effect on water quality have not been reported. Our results showed that Ca(ClO), KSO, and sodium percarbonate (SPC) treatment could lead to the disaggregation of microplastic hetero-aggregates as well as a rise in cell membrane permeability, which caused a large amount of organic matter to be released. When the amount of oxidant dosing is insufficient, the oxidant cannot completely degrade the released organic matter, resulting in DOC, DTN, DTP and other indicators being higher than before oxidation, thus causing secondary pollution of the water body. In comparison, KFeO can purify the water body stably without destroying the microplastic hetero-aggregates, but it only weakly inhibits the toxic cyanobacteria and , which may cause cyanobacterial bloom as well as algal toxin and odorant contamination in practical application. Compared with the other oxidizers, KSO provides better inhibition of toxic cyanobacteria and has better ecological safety. Therefore, when treating microplastic-containing water bodies, we should consider both water purification and ecological safety, and select appropriate oxidant types and dosages to optimize the water treatment.

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不同氧化剂对微塑料异质聚集体行为的影响

微塑料异质聚集体是水环境中微塑料的稳定形式。然而，在对含有微塑料异质聚集体的水体进行消毒时，其在水中对不同氧化剂的反应以及对水质的影响尚未见报道。我们的研究结果表明，Ca(ClO)、KSO和过碳酸钠（SPC）处理可导致微塑料异质聚集体解聚以及细胞膜渗透性上升，从而导致大量有机物释放。当氧化剂投加量不足时，氧化剂不能完全降解释放的有机物，导致DOC、DTN、DTP等指标高于氧化前，从而造成水体的二次污染。相比之下，KFeO可以稳定净化水体，不破坏微塑料异质聚集体，但对有毒蓝藻的抑制作用较弱，在实际应用中可能会导致蓝藻水华以及藻类毒素和气味污染。与其他氧化剂相比，KSO对有毒蓝藻有更好的抑制作用，具有更好的生态安全性。因此，在处理含微塑料水体时，应兼顾水体净化和生态安全，选择合适的氧化剂种类和投加量，优化水处理。