公共绿地利用下污泥有机肥中典型微塑料的释放及垂直迁移行为

吴苾; 吴铮; 黄涛

doi:10.13205/j.hjgc.202607015

公共绿地利用下污泥有机肥中典型微塑料的释放及垂直迁移行为

doi: 10.13205/j.hjgc.202607015

吴苾¹,
吴铮²,
黄涛^1, ,

1. 西南交通大学环境科学与工程学院, 成都 611756;
2. 西华大学应急管理学院, 成都 610039

基金项目:

四川省国际科技创新合作项目“城市污泥-餐厨垃圾协同处理中微塑料赋存特征及迁移转化机理研究”（2024YFHZ0283）

详细信息

作者简介:
吴苾（2000—），女，硕士研究生，主要研究方向为固体废弃物处置与资源化。Wubi1212@126.com

通讯作者:
黄涛（1970—），男，教授，主要研究方向为固体废弃物处置与资源化。taohuang70@126.com

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出版历程
- 收稿日期: 2026-02-11
- 网络出版日期: 2026-09-01

Release and vertical migration behavior of typical microplastics from sewage sludge organic fertilizer applied in public green spaces

WU Bi¹,
WU Zheng²,
HUANG Tao^{1
, ,}

1. School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu 611756, China;
2. School of Emergency Science, Xihua University, Chengdu 610039, China

摘要

摘要: 微塑料污染问题日益严峻。土壤作为陆地生态系统中微塑料的主要汇，其污染与污泥有机肥施用密切相关。研究以污泥有机肥中常见的聚丙烯（PP）和聚乙烯（PE）为对象，基于成都地区降雨特征开展室内模拟实验，探究微塑料在非饱和多孔介质中的释放与迁移规律。结果表明：6个月模拟降雨条件下，20~40 μm、0.2%添加丰度（质量比）的PE释放比例为（26.1±1.8）%，显著高于PP（16.4±1.3）%；40~60 μm粒径释放量最高，过高丰度易引发团聚从而抑制释放。24个月模拟迁移实验显示，PE迁移能力显著高于PP，迁移峰值于14~18个月区间出现，40~60 μm粒径迁移能力最强。环境因素对迁移具有显著调控作用：迁移能力随pH升高而增强，高pH下污泥浸出液的促迁移效应减弱；且迁移能力随电解质浓度升高而降低，高EC下污泥浸出液的抑制作用增强；有机物浓度呈低促高抑的非线性响应。该研究可为防治公共绿地微塑料土壤污染提供数据支撑和理论参考。
- 微塑料 /
- 污泥有机肥 /
- 非饱和介质 /
- 污泥有机肥浸出液 /
- 释放 /
- 垂直迁移
Abstract: The issue of microplastic pollution is becoming increasingly severe. Soil serves as a major sink for microplastics in terrestrial ecosystems， and its pollution situation is closely associated with the application of sewage sludge organic fertilizer. In this study， polypropylene （PP） and polyethylene （PE）， two common microplastics in sewage sludge organic fertilizer， were selected as target objects. Based on the rainfall characteristics in Chengdu， indoor simulation experiments were conducted to investigate the release and transport patterns of microplastics in unsaturated porous media. The results showed that under six months of simulated rainfall， the release rate of PE （26.1±1.8）% at the addition level of 0.2%（weight ratio）， with a size of 20 to 40 μm， was significantly higher than that of PP （16.4±1.3）%. The highest release amount was observed for the 40 to 60 μm particle size， while excessive microplastics abundance tended to induce its aggregation， thereby inhibiting the release. A 24-month simulated transport experiment revealed that the transport capacity of PE was significantly higher than that of PP， with the peak transport occurring between 14 and 18 months， and the strongest transport capacity was observed for the 40 to 60 μm particle size. Environmental factors significantly regulated the transport of microplastic particles： transport capacity increased with the rising pH， while the promoting effect of sludge leachate on transport diminished under alkalic conditions； it decreased with increasing electrolyte concentration， with the inhibitory effect of sludge leachate got enhanced under high EC； and a non-linear response to organic matter concentration was observed， characterized by promotion at low concentrations and inhibition at high concentrations. This study provides data support and a theoretical reference for preventing and controlling microplastic soil pollution in public green spaces.
- microplastics /
- sewage sludge organic fertilizer /
- unsaturated medium /
- sewage sludge organic fertilizer leachate /
- release /
- vertical migration

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