<br>辅助电场对粪肥堆肥过程中重金属钝化的影响,Science of the Total Environment

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辅助电场对粪肥堆肥过程中重金属钝化的影响
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-07-29 , DOI: 10.1016/j.scitotenv.2023.165909
Xiang Li ₁ , Shengwei Wang ₁ , Silan Zhao ₁ , Huiming Chang ₁ , Yanxia Li ₁ , Yan Zhao ₁

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堆肥是处理和利用牲畜粪便和污泥的主要技术之一。然而，由于重金属具有潜在的环境危害和健康风险，因此是堆肥利用的主要问题。本研究旨在探讨电场辅助堆肥对重金属变化及其影响因素的影响。结果表明，电场显著降低了 Mn、Zn、Cu、Ni 和 Cd 等生物可利用重金属的含量，其生物利用度分别降低了 61.7、63.8、64.9、83.7 和 63.8 %。转化为稳定态的重金属增加，表明电场也钝化了这些重金属，降低了它们的生物毒性，稳定了它们的形式。Spearman 的相关性分析表明，物质、温度和有机物的变化是影响重金属形态的主要环境因子。微生物群落分析表明，在电场辅助堆肥过程中，假单胞菌和芽孢杆菌等金属抗性细菌的丰度增加，它们的相对丰度在电场辅助堆肥堆中分别增加到 2.66 % 和 15.63 %，而传统堆肥中的值分别为 1.88 % 和 4.36 %。目前的研究表明，电场辅助堆肥可以显着减少堆肥中重金属的可用性，从而减轻与其应用相关的健康风险。

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Effects of an assistive electric field on heavy metal passivation during manure composting

Composting is one of main technologies for treating and thus utilizing livestock manure and sludge. However, heavy metals are major concerns in compost utilization due to their potential environmental hazards and health risks. This study aimed to investigate the effects of electric field-assisted composting on the variations of heavy metals and the affecting factors. The results showed that electric field significantly reduced the contents of bioavailable heavy metals including Mn, Zn, Cu, Ni, and Cd, with their bioavailable concentrations decreasing by 61.7, 63.8, 64.9, 83.7, and 63.8 %, respectively. The heavy metals being transformed into stable states were increased, indicating that the electric field also passivated these heavy metals and reduced their biological toxicity and stabilized their forms. Spearman's correlation analysis revealed that the changes in substances, temperature, and organic matter were the dominant environmental factors affecting the forms of heavy metals. Microbial community analysis indicated an increase in the abundance of metal-resistant bacteria such as Pseudomonas and Bacillus during electric field-assisted composting, with their relative abundances being increased to 2.66 % and 15.63 % in the pile of electric field-assisted composting, respectively, compared to the values of 1.88 % and 4.36 % respectively in the conventional composting. The current study suggests that electric field-assisted composting can significantly reduce the availability of heavy metals in the compost, and thus mitigate the health risks associated with its application.

更新日期：2023-07-29

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