Figure 6. (A) ratio of Microcystis sp. size to microbubble size; (B) cluster analysis of Microcystis sp. and microbubble particle size
The cluster analysis results of the size ratio of Microcystis and microbubble are shown in Fig. 6(B). Class II analysis were carried out and the clustering centers were 1.03 and 2.24. The proportion of cases in each clustering center was 76% and 23%, respectively. The cluster centers of the Class III analysis were 0.9,1.67 and 2.89, accounting for 58%, 34% and 8%, respectively. Based on the results of the two types of analysis, it is known that in the formed microbubble-algae combination, the proportion of Microcystis/microbubble size ratio of 1.03 and 0.9 is the highest, and both exceed 50%. When the size ofMicrocystis is equivalent to the size of microbubbles, the two are most likely to adhere.