电解锰渣改性提高了铅锌尾矿对植物生长的适宜性

IF 6.1 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecotoxicology and Environmental Safety Pub Date : 2025-10-01 DOI:10.1016/j.ecoenv.2025.119158

Mengting Lin , Xusheng Jiang , Xuehong Zhang , Luyang Wang , Hui Qiu , Huachun Lan , Guo Yu , Jie Liu

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引用次数: 0

摘要

铅锌尾矿库生态恢复迫切需要植被恢复。然而，铅锌尾矿的恶劣性质——包括聚集性差、营养缺乏和低保水能力——严重阻碍了植物的定植和生长。本研究利用电解锰渣（EMR）这一固体废物，有效改善了铅锌尾矿的物理结构和营养状况。电解锰渣具有强粘结性和高铵态氮含量的特点。此外，1 % EMR处理的铅锌尾矿中有毒元素浸出率较低，环境风险较低。x射线计算机断层扫描和核磁共振分析显示，EMR修正显著降低了铅锌尾矿的总孔隙度，提高了其保水能力（p <； 0.05）。这种改善可能是由于EMR粘土颗粒填充颗粒间空隙以及Ca₂（AlFe）（Si₂O₇）（SiO₄）O（OH）的形成，这是一种类似水合硅酸钙凝胶的水合凝胶。EMR中的Ca 2 +与尾矿表面的硅酸盐反应形成的水合凝胶可以增加颗粒间的凝聚力。盆栽试验表明，1 % EMR添加量显著促进了尾矿中黑麦草的生长，增加了13.7 %的新鲜生物量（p <； 0.05）。综上所述，EMR修正是促进铅锌尾矿库植被恢复中植物定植和生长的有效策略。

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Electrolytic manganese residue amendment improved the suitability of lead-zinc tailings for plant growth

Revegetation is urgently needed for the ecological restoration of lead-zinc tailings ponds. However, the harsh properties of lead-zinc tailings—including poor aggregation, nutrient deficiency, and low water retention capacity—severely hinder plant colonization and growth. This study effectively improved the physical structure and nutrient status of lead-zinc tailings using electrolytic manganese residue (EMR), a solid waste characterized by strong cohesiveness and high ammonium nitrogen content. Moreover, lead-zinc tailings amended with 1 % EMR had low leaching of toxic elements, indicating low environmental risk. X-ray computed tomography and nuclear magnetic resonance analyses revealed that EMR amendment significantly reduced total porosity of lead-zinc tailings while enhancing their water retention capacity (p < 0.05). The improvements likely resulted from the filling of interparticle voids by EMR clay particles and the formation of Ca₂(AlFe)(Si₂O₇)(SiO₄)O(OH), a hydrated gel similar to the hydrated calcium silicate gel. The hydrated gel formed by the reaction between Ca²⁺ from EMR and silicates on tailing surfaces may increase interparticle cohesion. A pot experiment showed that 1 % EMR amendment significantly promoted ryegrass growth in tailings, increasing fresh biomass by 13.7 % (p < 0.05). Overall, these findings indicate that EMR amendment is a promising strategy to enhance plant colonization and growth in the revegetation of lead-zinc tailings ponds.

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来源期刊

Ecotoxicology and Environmental Safety 环境科学-毒理学

CiteScore

12.10

自引率

5.90%

发文量

1234

审稿时长

88 days

期刊介绍： Ecotoxicology and Environmental Safety is a multi-disciplinary journal that focuses on understanding the exposure and effects of environmental contamination on organisms including human health. The scope of the journal covers three main themes. The topics within these themes, indicated below, include (but are not limited to) the following: Ecotoxicology、Environmental Chemistry、Environmental Safety etc.