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In order to further supplement the mechanism of the enhanced coagulation efficiency of the fine bubble co-coagulation process and the potential of the process for engineering applications, this paper investigated the effect of calcium ion concentration response on the enhanced removal of humic acid（HA）by the fine bubble co-coagulation process. The results showed that the fine bubbles could enhance the removal of HA with different calcium ion concentration responses, but the enhancement effect was different with different circulation times. When the cycle time of fine bubbles was kept constant at 1min, the participation of fine bubbles in the coagulation process could enhance the removal efficiency of HA by forcing the hydrolysis of polyaluminum chloride（PACl）, elevating the potential of the solution to the isoelectric potential, and promoting the complexation between HA and Ca2+, and the removal efficiency of HA increased with the increase of Ca2+ concentration, and the removal efficiency of HA increased about 42% with the increase of Ca2+ concentration, and increased about 42% with the increase of Ca2+ concentration, and increased about 42% with the increase of Ca2+ concentration. The HA removal efficiency increased with increasing Ca2+ concentration, up to about 42% compared to the conventional coagulation process without the presence of fine bubbles. In addition, with the extension of the fine bubbles circulation time, the Zeta potential of the solution gradually increased, which affected the enhanced removal efficiency of HA. The above findings provide data and theoretical support for the application of the fine bubble co-coagulation process in engineering practice.
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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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