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Outline
Outbreak of blue-green algae posesa threat todrinking water safety. Coagulation is a key technology for algae removal in waterworks, andiron salt is one of the most commonly used coagulants. To further explore the mechanism of iron salt for removing algae, Microcystis aeruginosa and algal organic matters were selected as the target pollutants. The effect of crystal transformation of the main hydrolysis products on removal efficiency and coagulation process was investigated. The results indicated thatthe transformationof crystalline state, crystalline phase, and crystal form of hydrolysis products were mainly affected by the coagulant dosage and pH value. With the increase of dosage and pH, the main hydrolysis product FeO(OH) was replaced by amorphous Fe(OH)3(PDF#22-0346), and then converted to Fe3O4. Amorphous Fe(OH)3 finally transformed into quasicrystalFe (OH)3(PDF#38-0032). The surface characteristics of algal flocs were affected by the crystalline state and crystal form change of hydrolysis products. The maximum SBET and Vt values of algal flocs were observed at a dosage of 0.7mmolFe/L, which werebeneficial to adsorb algal organic matters andresulted in the optimal treatment efficiency. Within the range of 0.1~0.5mmolFe/L, the crystal transformation of the main hydrolysis products had a more significant effect on algae removal efficiency, particle size and growth rate of algal flocs.
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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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