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It has become an important measure for emergency treatment of cyanobacteria by using modified clays to control algal blooms in coastal regions and aquaculture water.However, there is less research focusing on the security risks led by toxic algae which were attached on the modified clay and left in the water. In this paper, PAC modified clay was selected for simulation experi⁃ ments.The effects of applying the modified clay on the structure of cyanobacteria attached on the PAC modified clay, release and re⁃ duction of nutrients and microcystins, and the amounts of other functional bacteria (nitrifying⁃denitrifying bacteria) were investiga⁃ ted. The results showed that algae removal rate of modified clay applied in the slightly blooming water was 96.04% ±0.99% . There was not a significant difference of algae removal rate inslightly blooming water and severely blooming water. Application of the modi⁃ fied clay effectively controlled the concentration of cyanobacteria in water for a long time. Transmission electron microscopy experi⁃ ments revealed that cyanobacterial cell membrane became incomplete and the regular lamella structure was damaged after the cya⁃ nobacteria being settled with modified clay for 4 days. With the damage of cyanobacteria attached on PAC modified clay, the con⁃ tent of dissoloved total nitrogen in water increased rapidly, while the content of dissoloved total phosphorus could be maintained at a low concentration for a long time. With the application of PAC modified clay in water, the total bacteria number in the water was in agreement with that of the blank control, while the number of nitrifying⁃denitrifying bacteria decreased significantly. The releasing

Impacts of PAC modified clay applied in the control of cyanobacteria bloom and left in water on water environment