废弃铅锌矿堆碴边坡重金属污染营林修复技术研究

Restoration Technique for Heavy Metal Polluted Slag Slope in Abandoned Lead-Zinc Mine

摘要: 以浙江省庆元县废弃铅锌矿PD478 平硐口堆碴边坡为例，结合城市森林公园建设，开展边坡碴土体、死亡植株、下方水体的重金属污染情况以及理化性质调查，分析影响造林制约因素和造林的可行性，并采取隔离种植、有机改良和全覆盖植被的营林技术进行修复实践。结果表明，边坡绿化效果良好，植物均生长正常，而且边坡下水体Pb 含量由修复前的0.300 5 mg·L-1 降到修复后的0.005 0 mg·L-1、Zn 含量由修复前的69.585 0 mg·L-1 降到修复后的0.700 0 mg·L-1、Cd 含量由修复前的1.959 1 mg·L-1 降到修复后的0.001 7 mg·L-1，取得了非常明显的修复效果。

Abstract: In March 2017, investigations were carried out on pollution of water, soil and plant on slag slope in abandoned lead-zink mine in Qingyuan, Zhejiang province. Analysis was made on limits for restoration and greening. From October 2018, greening had been executed by isolation plantation, organic improvement and coverage of substrate with plant seeds. In October 2019, the project was ended. The results showed that plants grew normally. In April 2020, determination on Pb, Zn and Cd content in the water body underneath the slope decreased from 0.300 05 to 0.005 0 mg/L, 69.585 0 to 0.700 0 mg/L and 1.959 1 to 0.001 7 mg/L respectively.