微塑料颗粒(MPPs)对河流水系统的污染是新兴的全球环境问题之一,具有潜在的广泛生态,社会经济,和健康影响。废水处理厂(WWTP)处理和处理废水以去除污染物并将安全的水释放到环境中。在南亚,关于微塑料的表征及其在WWTP中的去除的研究有限。在这项工作中,我们报告了位于加德满都市巴格马蒂河河岸的Guheshwori污水处理厂的废水和污泥样品(n=300)中的微塑料特征,尼泊尔代表进口,二级曝气池(SAT),出口,和污泥从2021年11月到2022年11月。平均而言,我们检测到31.2±17.3MPP/L,11.2±9.4MPPs/L,8.5±5.6MPPs/L,从入口收集的样品中含有6.6±4.8MPPs/g,SAT,出口,和污泥,分别。通常发现的MPPs是纤维的形式,碎片,泡沫,和颗粒。很大程度上,MPP是红色的,黄色,白色,蓝色,和黑色。在44μm-150μm中,150μm-500μm和500μm-5mm的尺寸部分类别,最主要的部分是入口500μm-150μm,SAT,和污泥,和出口采样单元中的150μm-44μm。Guheshwori污水处理厂平均能够去除72.5%的MPP,主要发生在进水口。释放到河流中的废水和污泥仍然含有大量的微塑料颗粒。
Contamination of river water systems by microplastic particles (MPPs) is one of the emerging global environmental concerns with potentially widespread ecological, socioeconomic, and health implications. A wastewater treatment plant (WWTP) processes and treats wastewater to remove pollutants and release safe water into the environment. There has been limited research on the characterization of microplastics and their removal in WWTP in South Asia. In this work, we report on the characterization of microplastics in wastewater and sludge samples (n = 300) from Guheshwori WWTP located on the bank of the Bagmati River in Kathmandu city, Nepal representing inlet, secondary aeration tank (SAT), outlet, and sludge from November 2021 to November 2022. On average, we detected 31.2 ± 17.3 MPPs/L, 11.2 ± 9.4 MPPs/L, 8.5 ± 5.6 MPPs/L, and 6.6 ± 4.8 MPPs/g in the samples collected from inlet, SAT, outlet, and sludge, respectively. Commonly found MPPs were in the form of fiber, fragments, foam, and pellets. Largely, MPPs were red, yellow, white, blue, and black. Among the 44 μm - 150 μm, 150 μm - 500 μm and 500 μm - 5 mm categories of size fractions, the most dominant fractions were 500 μm - 150 μm in inlet, SAT, and sludge, and 150 μm - 44 μm in the outlet sampling unit. The Guheshwori WWTP was able to remove 72.5 % of MPPs on average, that mostly occurred in the inlet. The
effluent released into the river and the sludge still contained a significant number of MPPs.