Microplastics in an urban wastewater treatment plant: The influence of physicochemical parameters and environmental factors
Microplastics in an urban wastewater treatment plant: The influence of physicochemical parameters and environmental factors
复制标题
DOI：
10.1016/j.chemosphere.2019.124593
复制
发表时间：
2020-01-01
期刊：
影响因子：
8.8
通讯作者：
Lopez-Castellanos, Joaquin
中科院分区：
文献类型：
--
作者：
Bayo, Javier;Olmos, Sonia;Lopez-Castellanos, Joaquin
本文根据不同的水参数和环境因素，介绍了城市污水处理厂（WWTP）中微塑料（MP）的丰度、浓度和变异性，以及其可能的来源和去除效率。根据标准化提取方案，通过密度分离、三目显微镜鉴定和傅里叶变换红外光谱进行聚合物分析，对来自处理过程四个阶段的总共 352.6 升废水进行了处理。 MP 占总微垃圾的 46.6%，在污水处理厂最终废水中去除了 90.3%，具有统计学意义。分离出了五种不同的形状；即碎片、薄膜、珠子、纤维和泡沫。最终流出物中最突出的 MP 形式是碎片和纤维，最常见的尺寸等级为 400-600 克。确定了 17 个不同的聚合物系列，其中低密度聚乙烯是最常见的聚合物（52.4%），呈薄膜形式（27.7%），主要来自污水处理厂附近的农业温室和单个塑料袋（值得注意的是，仅在一年前，西班牙消费者才为这些塑料袋付费）。事实证明，含有高浓度悬浮固体的进水废水具有较低的 MP 负荷，但 MP 尺寸较大，这可能是由于颗粒物的异质聚集所致。还建议将聚苯乙烯和聚对苯二甲酸乙二醇酯与有机材料团聚，两者的表面能均高于 25 mN m(-1)，足以实现高生物污垢率。污水处理厂在温暖季节缓冲尖点微塑料浓度，使污水处理厂保持稳定的性能。 (C) 2019 Elsevier Ltd. 保留所有权利。
This paper presents the abundance, concentration and variability of microplastics (MP) in an urban wastewater treatment plant (WWTP), according to different water parameters and environmental factors, their possible sources and removal efficiency. A total of 352.6 L of wastewater from four stages of the treatment process were processed following a standardized extraction protocol by density separation, trinocular microscopic identification and polymeric analysis by Fourier transform infrared spectroscopy. MP comprised a 46.6% of total microlitter, with a statistically significant removal of 90.3% in the final effluent of the WWTP. Five different shapes were isolated; i.e. fragment, film, bead, fiber, and foam. The most prominent MP forms in the final effluent were fragments and fibers, with the most common size class being 400-600 gm. Seventeen different polymer families were identified, with low-density polyethylene being the most prevalent one (52.4%) in a film form (27.7%), mostly from agriculture greenhouses near the sewage plant and single plastic bags (it is noted that only a year ago consumers are charged for them in Spain). Influent wastewater with high concentrations of suspended solids proved to have a low MP burden with a larger MP size, possibly due to a hetero-aggregation with particulate matter. Agglomeration of polystyrene and polyethylene terephthalate with organic material is also suggested, both with surface energies higher than 25 mN m(-1) enough for a high biofouling rate. The sewage plant cushions sharp-point microplastic concentrations during the warm season, allowing a stable performance of the WWTP. (C) 2019 Elsevier Ltd. All rights reserved.