Palygorskite-mediated simultaneous nutrient removal and antibiotic degradation from aquaculture wastewater in lab-scale constructed wetlands

IF 13.3 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Chenglong Xu, Cuifang Zhu, Yunhao Li, Hanlin Zhang, Weiguang Lv
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Abstract

In this study, palygorskite was employed as a substrate in laboratory-scale constructed wetlands (CWs) over a period of 180 days to investigate the removal efficiency of pollutants from mariculture wastewater under high loads of enrofloxacin (ENR) stress. The results indicated that the incorporation of palygorskite into CWs resulted in average effluent concentrations of total phosphorus (TP), total nitrogen (TN), chemical oxygen demand (COD), and ENR reaching 0.07 ± 0.00 mg/L, 1.07 ± 0.06 mg/L, 11.57 ± 1.04 mg/L, and 0.047 ± 0.002 mg/L, respectively. The removal efficiencies reached 96.45 ± 0.04 %, 94.62 ± 0.27 %, 88.61 ± 1.22 %, and 91.14 ± 5.00 % respectively, with phosphorus removal significantly surpassing that reported for similar CWs. This superior performance was mainly attributed to the strong binding mechanisms between phosphorus and the metal oxides and hydroxides leached from the palygorskite. The palygorskite stimulated the secretion of extracellular polymeric substances (EPS), accelerated biofilm establishment, and enhanced the relative abundance of key functional bacteria associated with carbon, nitrogen, and antibiotic removal, thus achieving rapid denitrification and efficient organic matter removal. Monitoring of metals (Ca, Fe, Mn, and Cu) in the CWs effluent suggested that their presence was insufficient to affect cytoplasmic enzyme activity or cause oxidative stress damage to plants. In conclusion, palygorskite serves as an environmentally friendly, high-nutrient removal alternative, apt as a substrate for CWs.

Abstract Image

在实验室规模的构建湿地中,以鳞片钾盐为介质同时去除水产养殖废水中的营养物质和降解抗生素
本研究在实验室规模的建构湿地(CWs)中使用了叶腊石作为基质,历时 180 天,以研究在高负荷恩诺沙星(ENR)胁迫下海产养殖废水中污染物的去除效率。结果表明,在 CWs 中加入叶腊石后,总磷 (TP)、总氮 (TN)、化学需氧量 (COD) 和 ENR 的平均出水浓度分别达到 0.07 ± 0.00 mg/L、1.07 ± 0.06 mg/L、11.57 ± 1.04 mg/L 和 0.047 ± 0.002 mg/L。除磷效率分别达到 96.45 ± 0.04 %、94.62 ± 0.27 %、88.61 ± 1.22 % 和 91.14 ± 5.00 %,大大超过了同类化武的除磷效率。这种优异的性能主要归功于磷与从辉绿岩中析出的金属氧化物和氢氧化物之间的强结合机制。钙钛矿刺激了细胞外聚合物质(EPS)的分泌,加速了生物膜的建立,提高了与碳、氮和抗生素去除相关的关键功能细菌的相对丰度,从而实现了快速反硝化和高效有机物去除。对化武废水中金属(钙、铁、锰和铜)的监测表明,它们的存在不足以影响细胞质酶的活性或对植物造成氧化应激损害。总之,叶蜡石是一种环境友好型的高养分去除替代品,非常适合作为化武的基质。
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来源期刊
Chemical Engineering Journal
Chemical Engineering Journal 工程技术-工程:化工
CiteScore
21.70
自引率
9.30%
发文量
6781
审稿时长
2.4 months
期刊介绍: The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.
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