Simultaneous Passivation and Removal of Heavy Metals in the Compost of Agricultural Waste and Sediment by the Enhanced Migration of Liquid Media

IF 3.8 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Water, Air, & Soil Pollution Pub Date : 2024-11-19 DOI:10.1007/s11270-024-07626-z

Hongjuan Jiang, Yaoning Chen, Yuanping Li, Li Chen, Mengyang Zhao, Jun Wang, Yanrong Chen, Chen Zhao, Mengwei Luo, Qianruyu Wang, Yaoqin Nie

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引用次数: 0

Abstract

The study investigated the impact of different liquid media (ultrapure water (UW), citric acid (CA), and ethylenediaminetetraacetic acid disodium (EDTA)) on the composting process and heavy metal (HM) remediation. After 36 days of composting agricultural waste and sediment, the pile underwent enhanced migration with UW, 0.1 M CA, and 0.1 M EDTA. UW increased pH and C/N ratio while reducing total nitrogen (TN) and dehydrogenase activity (DA). In contrast, CA and EDTA reduced pH, TN, and DA, with EDTA also increasing organic matter and TN. The difference in liquid media also influenced the evolution of humic substances (HS). UW reduced HS, fulvic acid, and humic acid, while CA and EDTA enhanced their production, likely due to Fenton-like reactions promoted by chelates formed between EDTA/CA and Fe²⁺, breaking down lignin, and generating HS precursors. Regarding HM removal, EDTA-enhanced migration proved most effective, achieving 38.08% and 51.15% removal of Cr and Cd, respectively. This was attributed to the strong chelating ability of EDTA, forming stable metal complexes that were removed with the liquid media. The enhanced migration also caused a redistribution of HM speciations, with an increase in residual fractions and a decrease in exchangeable and reducible fractions. Overall, the study shows that the EDTA-enhanced migration in compost could combine the passivation and removal in the treatment of heavy metal pollution, which provides a new strategy to remediate the sediments contaminated by HMs.

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利用液体介质的强化迁移同时钝化和去除农业废弃物堆肥和沉积物中的重金属

该研究调查了不同液体介质（超纯水 (UW)、柠檬酸 (CA) 和乙二胺四乙酸二钠 (EDTA)）对堆肥过程和重金属 (HM) 修复的影响。农业废弃物和沉积物堆肥 36 天后，堆体在 UW、0.1 M CA 和 0.1 M EDTA 的作用下发生了强化迁移。UW 提高了 pH 值和 C/N 比值，同时降低了总氮（TN）和脱氢酶活性（DA）。相比之下，CA 和 EDTA 降低了 pH 值、TN 和 DA，EDTA 还增加了有机物和 TN。液体培养基的不同也影响了腐殖质（HS）的演化。UW 减少了腐殖质、富里酸和腐殖酸的产生，而 CA 和 EDTA 则增加了它们的产生，这可能是由于 EDTA/CA 与 Fe2+ 形成的螯合物促进了芬顿反应，分解了木质素，并产生了腐殖质前体。在去除 HM 方面，EDTA 增强迁移被证明是最有效的，对铬和镉的去除率分别达到了 38.08% 和 51.15%。这是因为乙二胺四乙酸具有很强的螯合能力，能形成稳定的金属络合物，随液体介质一起被去除。迁移能力的增强还导致了 HM 种类的重新分布，残留组分增加，可交换组分和可还原组分减少。总之，该研究表明，堆肥中的 EDTA 增强迁移可将重金属污染处理中的钝化和去除结合起来，为修复受 HMs 污染的沉积物提供了一种新策略。

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来源期刊

Water, Air, & Soil Pollution 环境科学-环境科学

CiteScore

4.50

自引率

6.90%

发文量

448

审稿时长

2.6 months

期刊介绍： Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments. Articles should not be submitted that are of local interest only and do not advance international knowledge in environmental pollution and solutions to pollution. Articles that simply replicate known knowledge or techniques while researching a local pollution problem will normally be rejected without review. Submitted articles must have up-to-date references, employ the correct experimental replication and statistical analysis, where needed and contain a significant contribution to new knowledge. The publishing and editorial team sincerely appreciate your cooperation. Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.