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This study investigates the adsorption and removal effects of powdered activated carbon on extracellular organic matters（EOM）from Microcystis aeruginosa（M. aeruginosa）at different growth phases and explores the removal efficiencies and adsorption mechanisms of characteristic organic components in EOM. The results indicated that the synergistic removal efficiency of organic components in M. aeruginosa EOM by powdered activated carbon was relatively low, ranging from 18.07%to 34.85%. Significant differences in adsorption efficiency were observed among different substance components, with the order of removal efficiency being microcystins>humic acids>proteins>polysaccharides. Each substance component exhibited varying proportions of easily adsorbable structures at different growth phases, leading to differences in adsorption capacity across phases. Easily adsorbable structures in polysaccharides were primarily released during the logarithmic phase, while those in proteins were predominantly secreted during the stable phase. Easily adsorbable structures in microcystins were predominantly secreted during the stable and decay phases, while the proportion of humic acid structure types showed no significant differences across phases. The adsorption process of activated carbon on M. aeruginosa EOM followed the principle of molecular-scale selective adsorption, primarily targeting low- and medium- molecular-weight substances, while exhibiting extremely poor adsorption performance for high- molecular-weight substances. This is a key factor contributing to the low removal efficiency of activated carbon for algal pollutants. This study provides significant scientific insights for the effective prevention and control of algal pollutants throughout the entire lifecycle of cyanobacterial blooms.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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