摘要

  鸟粪石(MgNH4PO3·6H2O)结晶是废水中磷回收的重要方法之一。对于牲畜废水，抗生素和抗生素抗性基因的高强度出现可能会诱导鸟粪石恢复，从而将抗生素抗性传播到环境中。然而，关于在鸟粪石回收中同时运输抗生素和 ARG 的报道有限。在本研究中，四环素（TCs）和四环素类抗生素抗性基因（ARGs）被选为目标污染物，并研究了它们在猪废水中鸟粪石回收中的差异残留。 TCs和ARGs的含量为4.88-79.5 mg/kg和6.99×107-2.14×1011拷贝/g，明显高于TCs 0.550-1.94 mg/kg和ARGs 3.98×104-5.66×1011个拷贝/g从合成废水中获得的份数/克。相关关系表明，影响TCs和ARGs转运的主要因素是不同的。网络分析结果表明，在总边缘中，TCs和ARGs之间的负相关占18.0%。冗余分析表明，回收产物中的鸟粪石、K-鸟粪石和无定形磷酸钙等矿物成分与有机物结合，对TCs残留的影响不显着，其中重金属在促进TCs迁移方面发挥了积极而显着的作用。出乎意料的是，矿物质成分和重金属对 ARGs 的整体运输没有表现出显着的促进作用。

 Struvite (MgNH4PO3·6H2O) crystallization is one of important methods of phosphorus recovery from wastewater. As to livestock wastewater, the high-strength occurrence of antibiotics and antibiotic resistance genes might induce struvite recovery to spread antibiotic resistance to the environment. However, limited information has been reported on the simultaneous transport of antibiotics and ARGs in struvite recovery. In the present study, tetracyclines (TCs) and tetracyclines antibiotic resistance genes (ARGs) were selected as the targeted pollutants, and their discrepant residues in struvite recovery from swine wastewater were investigated. TCs and ARGs were obviously detected, with their contents of 4.88–79.5 mg/kg and 6.99 × 107–2.14 × 1011 copies/g, notably higher than those of TCs 0.550–1.94 mg/kg and ARGs 3.98 × 104–5.66 × 107 copies/g obtained from synthetic wastewater. The correlational relationship revealed that predominant factors affecting TCs and ARGs transports were different. Results from network analyses indicated that among the total edges, the negative correlations between TCs and ARGs predominately occupied 18.0%. The redundancy analysis revealed that mineral components in the recovered products, including struvite, K-struvite and amorphous calcium phosphate, coupling with organic contents, displayed insignificant roles on TCs residues, where heavy metals exerted positive and remarkable functions to boost TCs migration. Unexpectedly, mineral components and heavy metals did not displayed significant promotion on ARGs transport as a whole.

  https://www.sciencedirect.com/science/article/abs/pii/S0269749120360498