针对 2018 年 8 月广东某湖发生暴发蓝藻水华事件，开展了最佳药剂以及最佳投药量的实验研究，通过对比三种化学除藻剂硫酸铜、高锰酸钾、聚合氯化铝的除藻效果，选择聚合氯化铝作为应急除藻剂，并确定聚合氯化铝理论最佳投药量为 20 mg /L，根据实验结果指导工程应用，除藻剂平均用量为 150 g /m2，治理后藻类总量下降了 90%，其他各项指标均达标，为今后蓝藻水华事件应急处置提供借鉴意义。

In response to the cyanobacteria blooms in the Lake in August 2018, guangdong, Experimental study on the best medicament and optimal dosage was carried out, comparing the removal efficiency and secondary pollution of three chemical algae removers, such as copper sulfate, potassium permanganate and polyaluminium chloride, polyaluminium chloride was selected as algae removal agent, which the optimum dosage of liquid polyaluminium chloride was 20 mg/L. According to the experimental results guides the engineering application, The average dosage of algaecide was 150 g /m2, after the emergency treatment, the density of the algae decreased by 90%, and all the other indicators were up to standard, It provides a reference for emergency disposal of cyanobacteria bloom events in the future