Environmental Science & Technology：污泥堆肥是微塑料进入土壤的一个途径 本研究推测微塑料可能是通过污泥堆肥进入土壤，随后进入土壤中的生物群，进而对环境中微塑

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东华大学环境科学与工程学院高品副教授团队研究了污泥堆肥中的微塑料及其应用于农业后在土壤中的去向，相关成果发表于Environmental Science & Technology（IF=7.149）。

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Abstract

The widespread application of sewage sludge produced from wastewater treatment plants for agricultural use has been regarded as a primary source of microplastics (MPs) into soils. However, little is known regarding MPs in sludge-based fertilizers and their relevant fate in soils as being applied in agriculture. We comprehensively investigated the abundance, polymer size, type, and morphology of MPs in dewatered sludge, sewage sludge composts, sludge-based fertilizer-amended soils, and earthworms by stereoscopy and micro Fourier transform infrared (μ-FTIR) spectrometry methods. The results clearly showed that the quantity of MPs in soils exhibited a close correlation with the application rate of sludge-based fertilizers. The total abundances of MPs were 545.9 and 87.6 items/kg in soils after annual amendment with 30 (field A) and 15 t/ha (field B) of sludge composts, which is significantly higher than that without compost application (field C, 5.0 items/kg). Correspondingly, MPs were found in earthworms with low quantities of 1.8 and 0.4 items/individual in fields A and B, respectively, while no MP was detected in field C. We speculate that sludge composts may act as a vehicle of MPs into soils and then enter soil biota and in turn influence the spread of MPs in the environment.

污水处理厂产生的污水和污泥广泛应用于农业生产，被认为是微塑料（MPs）进入土壤的主要来源。但是，对于污泥堆肥中的微塑料及其应用于农业后在土壤中的去向还知之甚少。本研究通过立体镜和微傅里叶变换红外光谱法（μ-FTIR），全面研究了脱水污泥、污泥堆肥、施用污泥堆肥的土壤和蚯蚓中微塑料的丰度、大小、类型和形态。结果表明，土壤中微塑料的含量与污泥堆肥的施用量密切相关。施用30 t/ha（A试验田）和15 t/ha（B试验田）污泥堆肥后，土壤中微塑料的总丰度分别为545.9个/kg和87.6个/kg，显著高于未施用堆肥（C试验田，5.0个/kg）土壤中的微塑料总丰度。相应地，在A试验田和B试验田的蚯蚓体内也发现了少量微塑料，分别为1.8个/条和0.4个/条，而在C试验田中未检测到。本研究推测微塑料可能是通过污泥堆肥进入土壤，随后进入土壤中的生物群，进而对环境中微塑料的传播产生影响。

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