加拿大温哥华一座主要二级污水处理厂中微塑料的滞留情况。
Retention of microplastics in a major secondary wastewater treatment plant in Vancouver, Canada.
机构信息
Coastal Ocean Research Institute, Ocean Wise Conservation Association, P. O. Box 3232, Vancouver, BC V6B 3X8, Canada; Environmental and Civil Engineering, University of British Columbia, Canada.
Coastal Ocean Research Institute, Ocean Wise Conservation Association, P. O. Box 3232, Vancouver, BC V6B 3X8, Canada.
出版信息
Mar Pollut Bull. 2018 Aug;133:553-561. doi: 10.1016/j.marpolbul.2018.06.006. Epub 2018 Jun 19.
Municipal wastewater treatment plants (WWTPs) are conduits through which microplastics (MPs) are released into aquatic environments. However, the technical challenges in working with wastewater sample matrices have precluded reliable particle count budget calculations. We applied newly-adapted methods for MP collection and analysis to a study of a major WWTP serving a population of 1.3 million people near Vancouver, Canada. Suspected MP particles, including fibres, were counted and categorized using light microscopy in influent, primary effluent, secondary effluent, primary sludge and secondary sludge. Fourier Transform Infrared Spectroscopy (FT-IR) confirmed that just 32.4% of the suspected MPs were plastic polymers. Using FT-IR corrected data, we estimate that 1.76 ± 0.31 trillion MPs enter the WWTP annually, with 1.28 ± 0.54 trillion MPs settling into primary sludge, 0.36 ± 0.22 into secondary sludge, and 0.03 ± 0.01 trillion MPs released into the receiving environment. This corresponds to a retention of microplastics of up to 99% in the WWTP.
城市污水处理厂（WWTP）是将微塑料（MPs）释放到水生环境中的渠道。然而，由于废水样品基质的技术挑战，可靠的颗粒计数预算计算一直难以实现。我们将新改编的 MP 收集和分析方法应用于加拿大温哥华附近一个为 130 万人服务的主要 WWTP 的研究中。在进水、初级出水、二级出水、初级污泥和二级污泥中，使用光学显微镜对疑似纤维等 MPs 颗粒进行计数和分类。傅里叶变换红外光谱（FT-IR）证实，只有 32.4%的疑似 MPs 是塑料聚合物。使用 FT-IR 校正数据，我们估计每年有 1.76±0.31 万亿个 MPs 进入 WWTP，其中 1.28±0.54 万亿个 MPs 沉降到初级污泥中，0.36±0.22 万亿个 MPs 沉降到二级污泥中，0.03±0.01 万亿个 MPs 释放到接收环境中。这相当于 WWTP 中微塑料的截留率高达 99%。
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