ABSTRACT

A large amount of waste material and tailings, generated from opencast mineral extraction, released different heavy metals and metalloids that polluted the mine surroundings soil. In the present investigation, an attempt was made to revegetate the open-cut mine affected area. Bulk soil samples were collected from derelict Frogmore tungsten mine site, and after physicochemical characterization of the soil samples, pot culture experiments were conducted in a green house. The different experimental soils like control soil, polluted soil, and polluted soil treated with the combined amendment, viz. Nano chailings (8 t/ha) + Nano composite of Zeolites + Nano Clay (Bentonite) (5%) + Nano composite of Zeolite + Zero valent iron (5%) + 5 t/ha FYM (Farm Yard Manure), were used in the investigation and maize (Zea mays L.) was taken as a test crop. This paper focused on amendments based on nano-enhanced materials. Amongst heavy metals like Cd, Ni, Zn, Cu, Pb, etc., Pb recorded the highest amount (125 mg/kg), which caused drastic reduction in different growth parameters of maize plant grown in mine spoiled soil. Microscopic structural changes, such as decrease in intercellular spaces, stomatal opening, shrinkage of palisade and epidermal cells, occurred in maize leaves grown in the mine polluted soil. Experimental results also revealed significant decrease in the fresh weight, dry weight, height, and girth of maize plants grown in mine spoiled soil. The contaminant distribution in the mine site should be considered in the design of management and remediation strategies. The possible practical consequences of these findings might be the application of nano-enhanced materials for the remediation and revegetation of the abandoned mine spoiled soils.

摘要

露天采矿产生的大量废料和尾矿释放出不同的重金属和准金属，污染了矿山周围的土壤。在本次调查中，试图对露天矿受影响区域进行重新植被。从废弃的 Frogmore 钨矿现场采集大块土壤样品，对土壤样品进行物理化学表征后，在温室中进行盆栽试验。不同的试验土壤，如对照土壤、污染土壤和联合改良剂处理的污染土壤，即。使用了纳米柴林（8 吨/公顷）+ 纳米沸石复合材料 + 纳米粘土（膨润土）（5%）+ 纳米沸石复合材料 + 零价铁（5%）+ 5 吨/公顷 FYM（农家肥）在调查和玉米（Zea mays L.)作为试验作物。本文重点关注基于纳米增强材料的修正。Cd、Ni、Zn、Cu、Pb等重金属., Pb 记录的最高量 (125 mg/kg)，这导致在矿山变质土壤中生长的玉米植物的不同生长参数急剧下降。在矿山污染土壤中生长的玉米叶片发生了细胞间隙减少、气孔张开、栅栏和表皮细胞收缩等微观结构变化。实验结果还表明，在矿山腐烂的土壤中生长的玉米植物的鲜重、干重、高度和周长显着降低。在设计管理和修复策略时应考虑矿区的污染物分布。这些发现可能带来的实际后果可能是纳米增强材料在废弃矿区土壤的修复和重新植被中的应用。