Polyamide microplastics act as carriers for cephalexin in the anammox process
Polyamide microplastics act as carriers for cephalexin in the anammox process
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DOI：
10.1016/j.cej.2022.138685
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发表时间：
2022-08
影响因子：
15.1
通讯作者：
Ye Wang;Dong-Qi Huang;Jun-Hui Yang;Gui-Feng Li;Ye Zhou;Jia-Yi Zhang;Ya Lu;Nian-Si Fan
中科院分区：
文献类型：
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作者：
Ye Wang;Dong-Qi Huang;Jun-Hui Yang;Gui-Feng Li;Ye Zhou;Jia-Yi Zhang;Ya Lu;Nian-Si Fan
新出现的污染物对人类健康构成了极大的风险，也给废水处理带来了巨大的压力。它们的相互作用也会影响功能微生物的活动。本研究探讨了厌氧氨氧化(Anammox)联合体对普通微塑料(聚酰胺，PA)和广谱抗生素(头孢氨苄，CFX)长期应激的响应及其机制。尽管0.1g L−1PA微塑料(MP)对脱氮性能没有明显的抑制作用，但吸附分析表明PA对头孢氨苄有大量的吸附。因此，投加0.5g L−1CFX和0.1g-0.2g L−1PA会导致厌氧氨氧化工艺的恶化。同时，优势属由假丝酵母转变为SBR1031，功能基因表达水平显著下降。此外，编码超氧化物歧化酶(SOD)的基因丰度增加了10.7%，验证了PA也造成了厌氧氨氧化细菌的氧化应激。PA通过吸附促进了CFX在Anammox系统中的积累，并扩大了其对Anammox联合体的副作用。本研究为厌氧氨氧化工艺在复杂废水处理中的应用提供了新的方向。
Emerging pollutants pose high risks to human health, and also put huge pressures on wastewater treatment. Their interactions would also affect the activity of functional microorganisms. This study investigated the response and mechanism of anaerobic ammonium oxidation (anammox) consortia to the long-term stress of common microplastics (polyamide, PA) and a broad-spectrum antibiotic (cephalexin, CFX). Although 0.1 g L−1PA microplastics (MP) did not significantly inhibit the nitrogen removal performance, adsorption assays revealed that large amounts of cephalexin were adsorbed by PA. Thus, 0.5 mg L−1CFX and 0.1–0.2 g L−1PA caused a deterioration of anammox process. Simultaneously, the most dominant genus changed fromCandidatusKuenenia tonorank o SBR1031, and expressional levels of functional genes dramatically decreased. In addition, the abundance of gene encoding superoxide dismutase (SOD) increased by 10.7 %, verifying that PA also caused the oxidative stress of anammox bacteria. PA promoted the accumulation of CFX in the anammox system through adsorption and extended its side effects on anammox consortia. This study provides a new direction into the implementation of anammox process in complex wastewater treatment.