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Microplastics in Sewage Sludge: Effects of Treatment

机译：污水污泥中的微塑料：处理效果

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摘要

Waste water treatment plants (WWTPs) are receptors for the cumulative loading of microplastics (MPs) derived from industry, landfill, domestic wastewater and stormwater. The partitioning of MPs through the settlement processes of wastewater treatment results in the majority becoming entrained in the sewage sludge. This study characterized MPs in sludge samples from seven WWTPs in Ireland which use anaerobic digestion (AD), thermal drying (TD), or lime stabilization (LS) treatment processes. Abundances ranged from 4196 to 15 385 particles kg~(-1) (dry weight). Results of a general linear mixed model (GLMM) showed significantly higher abundances of MPs in smaller size classes in the LS samples, suggesting that the treatment process of LS shears MP particles. In contrast, lower abundances of MPs found in the AD samples suggests that this process may reduce MP abundances. Surface morphologies examined using scanning electron microscopy (SEM) showed characteristics of melting and blistering of TD MPs and shredding and flaking of LS MPs. This study highlights the potential for sewage sludge treatment processes to affect the risk of MP pollution prior to land spreading and may have implications for legislation governing the application of biosolids to agricultural land.
机译：废水处理厂（WWTP）是累积来自工业，垃圾填埋场，生活废水和雨水的微塑料（MPs）累积受体。在废水处理的沉降过程中，MP的分配导致大多数污染物被夹带在污水污泥中。这项研究对爱尔兰7个污水处理厂的污泥样品中的MP进行了表征，这些废水采用厌氧消化（AD），热干燥（TD）或石灰稳定（LS）处理工艺。丰度范围从4196到15385个粒子kg〜（-1）（干重）。常规线性混合模型（GLMM）的结果显示，LS样品中较小尺寸类别的MP含量明显较高，这表明LS的处理过程会剪切MP颗粒。相反，在AD样品中发现的MP含量较低表明该过程可能会降低MP含量。使用扫描电子显微镜（SEM）检查的表面形态显示了TD MP的熔化和起泡以及LS MP的切碎和剥落的特征。这项研究强调了污水污泥处理过程可能会影响土地散布前MP污染的风险，并且可能对管理将生物固体应用于农业土地的立法产生影响。

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  • 来源
    《Environmental Science & Technology》 |2017年第2期|810-818|共9页
  • 作者

    A. M. Mahon; B. OConnell; M. G. Healy; OConnor; R. Officer; R. Nash; L. Morrison;

  • 作者单位

    Marine and Freshwater Research Centre (MFRC), Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland;

    Marine and Freshwater Research Centre (MFRC), Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland;

    CiviI Engineering, National University of Ireland, Galway, Ireland;

    Marine and Freshwater Research Centre (MFRC), Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland;

    Marine and Freshwater Research Centre (MFRC), Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland;

    Marine and Freshwater Research Centre (MFRC), Galway-Mayo Institute of Technology, Dublin Road, Galway, Ireland;

    Earth and Ocean Sciences, Schools of Natural Sciences and Ryan Institute, National University of Ireland, Galway, Ireland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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