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在序批式反应器中,聚氯乙烯微塑料和四环素共存时,污泥特性恶化,并促进了抗生素抗性基因的传播。

Deterioration of sludge characteristics and promotion of antibiotic resistance genes spread with the co-existing of polyvinylchloride microplastics and tetracycline in the sequencing batch reactor.

机构信息

School of Life Sciences, Liaoning Normal University; Key Laboratory of Plant Biotechnology of Liaoning Province, Dalian, Liaoning 116081, PR China.

School of Life Sciences, Liaoning Normal University; Key Laboratory of Plant Biotechnology of Liaoning Province, Dalian, Liaoning 116081, PR China..

出版信息

Sci Total Environ. 2024 Jan 1;906:167544. doi: 10.1016/j.scitotenv.2023.167544. Epub 2023 Oct 4.

Abstract

With the continuous increase in microplastics (MPs) and tetracycline (TC) entering wastewater treatment plants (WWTPs) along with sewage, the co-existence of MPs and TC in the biological treatment of wastewater has attracted extensive attention. This study investigated the effect of 1 mg/L polyvinyl chloride (PVC) MPs and 100 ng/L TC co-existing on sequencing batch reactors (SBRs) (S2) treating phenol wastewater in contrast to the control with TC alone (S1). The phenol removal efficiency was significantly inhibited by the co-existence of PVC MPs and TC. Sludge characteristics were also distinctively influenced. The decreased zone sludge velocity (ZSV) and increased sludge volume index (SVI) indicated that the combined effect of PVC MPs and TC deteriorated sludge settleability, which had positive and negative linear correlations with extracellular polymeric substances (EPS) content and the protein (PN)/polysaccharide (PS) ratio, respectively. Moreover, the decreased and increased relative abundances of potential phenol-degraders and antibiotic resistance gene (ARG) carriers may elucidate the inhibition of phenol removal and promotion of ARGs propagation with the co-occurrence of PVC MPs and TC. In addition, the enhanced potential ARGs hosts, loss of the EPS protective effect, and increased membrane permeability induced by reactive oxygen species (ROS) jointly promoted ARGs dissemination in the co-existence of PVC MPs and TC. Notably, the co-occurrence of ARGs and mobile genetic element (MGEs) indicated that the co-existence of PVC MPs and TC promoted the spread of some transposase-associated ARGs mediated by horizontal gene transfer (HGT).

摘要

随着微塑料 (MPs) 和四环素 (TC) 随着污水不断进入污水处理厂 (WWTPs), MPs 和 TC 在废水生物处理中的共存引起了广泛关注。本研究考察了 1mg/L 聚氯乙烯 (PVC) MPs 和 100ng/L TC 共存对序批式反应器 (SBR)(S2)处理含酚废水的影响,与单独 TC 处理(S1)相比。PVC MPs 和 TC 的共存显著抑制了苯酚的去除效率。污泥特性也受到明显影响。降低的区域污泥速度 (ZSV) 和增加的污泥体积指数 (SVI) 表明 PVC MPs 和 TC 的联合作用恶化了污泥沉降性能,这与胞外聚合物物质 (EPS) 含量和蛋白 (PN)/多糖 (PS) 比呈正线性和负线性相关。此外,潜在苯酚降解菌和抗生素抗性基因 (ARG) 载体的相对丰度降低和增加可能解释了 PVC MPs 和 TC 共存时苯酚去除的抑制和 ARGs 传播的促进。此外,活性氧物质 (ROS) 引起的潜在 ARGs 宿主增加、EPS 保护作用丧失和膜通透性增加,共同促进了 PVC MPs 和 TC 共存时 ARGs 的传播。值得注意的是,ARGs 和可移动遗传元件 (MGEs) 的共存表明,PVC MPs 和 TC 的共存促进了一些转座酶相关的 ARGs 通过水平基因转移 (HGT) 进行传播。

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