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In this study, the degradation efficiency and mechanism of oxytetracycline（OTC）in the Fe（Ⅲ）/peracetic acid（PAA）system were investigated, and the effects of initial pH, reagents dosage and water components on OTC degradation were also explored. The results suggested that in the degradation of OTC by Fe（Ⅲ）/PAA system, Fe（Ⅲ）complexed with OTC to form Fe（Ⅲ）-OTC complex, which reduced Fe（Ⅲ）to Fe（II）through internal electron transfer. Subsequently, the generated Fe（II）catalyzed PAA to produce reactive species, thus accelerating the degradation of OTC. The results of chemical probe and radical quenching experiments showed that organic radicals（CH3C（O）O• and CH3C（O）OO•）, HO• and Fe（IV）played major roles for the degradation of OTC in Fe（III）/PAA system. Acidic conditions were beneficial to the degradation of OTC in this system, while the removal of OTC under neutral and weakly alkaline conditions was mainly due to the PAA oxidation. The removal efficiency of OTC increased gradually with the increase of PAA or Fe（Ⅲ）dosage, but their excess concentration would inhibit OTC degradation. The presence of Cl- and natural organic matter in Fe（Ⅲ）/PAA systeminhibited the degradation of OTC, while NO3-, SO42- and HCO3- had little effect on OTC removal. The Fe（Ⅲ）/PAA system also ha d a good treatment effect on the other tetracycline pollutants.
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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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