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Layered double hydroxide modified basalt fiber (ZnFe-LDHs-BF) was applied to a constructed wetland system with vertical flow to investigate its performance and mechanisms in enhancing the treatment of antibiotic wastewater. The study involved altering initial concentrations, temperature, and pH to examine the impact on tetracycline adsorption by the modified basalt fiber. Additionally, metagenomic sequencing was used to assess the influence of the modified basalt fiber matrix on microbial communities. The study found that when the initial tetracycline concentration was 100mg/L and temperature was 25℃, after 24-hour reaction, ZnFe-LDHs-BF would have a maximum adsorption capacity of 9.19mg/g for tetracycline, over two times higher than that of traditional matrices. After incorporating ZnFe-LDHs-BF to the reactors, the average removal rates of tetracycline and erythromycin were 83.18% and 79.88%, respectively. They were 2~3 times higher than those observed in reactors with traditional gravel or unmodified basalt fiber, demonstrating enhanced purification capabilities for COD, NH4+-N, and TP. Metagenomic analysis revealed that ZnFe-LDHs-BF enriched the microbial community, particularly Candidatus Promineifilum and Anaerolinea functional bacteria. Additionally, the abundance of tetracycline resistance genes (e.g., tetC, tetG) and erythromycin resistance genes (e.g., ermF, ermB) increased by 1~2 times, thereby enhancing the microbial degradation rate of antibiotics by 2~3 times.
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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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