微塑料对垃圾渗滤液饱和区硫酸盐还原的影响

IF 11.3 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Journal of Hazardous Materials Pub Date : 2025-03-17 DOI:10.1016/j.jhazmat.2025.137928

Nan Zhang , Dongsheng Shen , Chengran Fang , Lifang Hu , Yuyang Long

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引用次数: 0

摘要

垃圾填埋场渗滤液饱和区硫酸盐还原行为受微塑料类型和温度的显著影响。本研究以垃圾填埋场渗滤液饱和区为研究对象，建立不同温度条件，研究不同类型微塑料（MPs）在不同温度下对硫酸盐还原行为的影响。结果表明，在聚乳酸（PLA）的影响下，H2S的释放更强烈。此外，H2S的累积释放量随着温度的升高而增加。PLA组在55°C时的H2S累积释放量分别是25°C、35°C和45°C时的33.2、2.3和1.4倍。PS、PE和PVC基团的硫酸盐还原行为相对较弱，55℃时H2S的累积释放量仅为PLA基团的0.004-0.01倍。与温度的影响相比，MPs的类型是造成异化硫酸盐还原（DSR）过程显著差异的主要因素。DSR功能基因在PLA中更容易富集，导致大量H2S释放。然而，在同化硫酸盐还原（ASR）过程中，微生物合成细胞组分所需的SO42−总消耗量并未受到MPs类型的显著影响。此外，温度是造成ASR过程显著差异的主要因素，MPs对ASR功能基因的富集能力随着温度的升高而降低。此外，与PS、PE和PVC相比，PLA更有利于异化硫酸盐还原菌（DSRB）的生长和富集，但负责H2S释放的优势属是由温度决定的。PLA组优势属由中低温（25℃和35℃）条件下的Desulfonatronum和thermodesulfomicroum转变为高温（45℃和55℃）条件下的Candidatus_Desulforudis。本研究揭示了MPs在垃圾填埋场渗滤液饱和区影响下的硫酸盐还原行为，为垃圾填埋场管理和污染控制提供了新的见解，例如从源头控制微塑料的进入，以降低大量H2S释放的风险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Effect of microplastics on sulfate reduction in landfill leachate-saturated zone

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Effect of microplastics on sulfate reduction in landfill leachate-saturated zone

The sulfate reduction behavior in the leachate-saturated zone of landfills is significantly influenced by the type of microplastics (MPs) and temperature. This study established different temperature conditions based on the leachate-saturated zone of landfills to investigate the sulfate reduction behavior influenced by different types of MPs at different temperatures. The results showed that H₂S release was more intense under the influence of polylactic acid (PLA). Additionally, the cumulative H₂S release increased with rising temperature. In the PLA group, the cumulative H₂S release at 55 °C was 33.2, 2.3, and 1.4 times higher than at 25 °C, 35 °C, and 45 °C, respectively. The sulfate reduction behavior in the PS, PE, and PVC groups is relatively weak, with the cumulative H₂S release at 55 °C being only 0.004–0.01 times that of the PLA group. Compared to the influence of temperature, the type of MPs was the main factor contributing to significant differences in the dissimilatory sulfate reduction (DSR) process. The DSR functional genes were more easily enriched in PLA, leading to the release of large amounts of H₂S. However, for the assimilatory sulfate reduction (ASR) process, the overall consumption of SO₄²⁻ for microbial synthesis of cell components was not significantly influenced by the type of MPs. Furthermore, temperature was the main factor contributing to significant differences in the ASR process, with the enrichment ability of MPs for ASR functional genes decreasing as the temperature increased. Additionally, compared to the PS, PE, and PVC, PLA was more conducive to the growth and enrichment of dissimilatory sulfate-reducing bacteria , but the dominant genus responsible for H₂S release was determined by temperature. The dominant genus changed from Desulfonatronum and Thermodesulfomicrobium at mid-to-low temperatures (25 °C and 35 °C) to Candidatus_Desulforudis at high temperatures (45 °C and 55 °C) in the PLA group. This study reveals the sulfate reduction behavior under the influence of MPs in the leachate-saturated zone of landfills, providing new insights for landfill management and pollution control, such as controlling the entry of microplastics at the source to reduce the risk of significant H₂S release.

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来源期刊

Journal of Hazardous Materials 工程技术-工程：环境

CiteScore

25.40

自引率

5.90%

发文量

3059

审稿时长

58 days

期刊介绍： The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.