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在研究粘土颗粒与赤潮生物絮凝作用的基础上，建立了粘土表面改性对其絮凝作用影响的理论模型，认为改变粘土颗粒的表面性质是提高其去除赤潮生物能力的主要途径，提出在粘土中引入PACS（聚羟基氯化铝）的改性方法。结果表明，对于微型原甲藻（Prorocentrumminimum）体系，粘土中引入微量PACS后，其去除率达90％以上的高岭土用量由原来的2g／L降至0.1g／L，去除效率提高近20倍。考察了PACS分子量对其促进粘土矿物去除赤潮生物作用的影响，发现不同制备条件的PACS其促进作用亦不相同，得到了最佳性能的PACS。
Based on the study of the flocculation of clay particles and red tide organisms, a theoretical model of the effect of clay surface modification on flocculation was established. It is considered that changing the surface properties of clay particles is the main way to improve its biological ability to remove red tide. The introduction of PACS (poly aluminum chloride) modification. The results showed that for the Prorocentrum minimum system, the amount of kaolin with the removal rate of over 90% was reduced from 0.1 g / L to 2 g / L and the removal efficiency increased nearly 20 times. The effect of PACS molecular weight on the bioactivity of clay minerals to remove red tide was investigated. It was found that PACS with different preparation conditions did not have the same promoting effect, and the best performance PACS was obtained.